PMPs

PMPs

[Mikael Abrahamsson]

Hello.

I have a SiL based PCI-E card and a PMP:

02:00.0 Mass storage controller: Silicon Image, Inc. SiI 3132 Serial ATA Raid II Controller (rev 01)

ata8.15: Port Multiplier 1.1, 0x1095:0x3726 r23, 6 ports, feat 0x1/0x9

I'm using Ubuntu 8.10 kernel 2.6.27-11-generic #1 SMP Thu Jan 29 19:24:39 
UTC 2009 i686 GNU/Linux

I'm running into all kinds of weird behaviour, like only P1 (port 1 out of 
5) on the PMP working with single drive. Also, it seems to differ whether 
I have a WD or Samsung drive, the WD drive works alone in P1 and P2 of the 
PMP, with the Samsung drive only working alone in P1. If I put the Samsung 
drive in P1 and put the WD drive in P3, the P3 drive isn't recognised upon 
hotplug. If I unplug Samsung P1 drive and re-insert it in the same P1 
hotswat bay again, drives in both P1 and P3 are recognised upon P1 
spinning up and being recognised.

Is this a known problem?

This is perfectly reproducible, I can provide logs if that would help. I'm 
also willing to try 2.6.29.x if there has been work done after 2.6.27.

-- 
Mikael Abrahamsson    email: swmike@swm.pp.se

Re: PMPs

[Tejun Heo]

Hello,

Mikael Abrahamsson wrote:
> I have a SiL based PCI-E card and a PMP:
> 
> 02:00.0 Mass storage controller: Silicon Image, Inc. SiI 3132 Serial ATA
> Raid II Controller (rev 01)
> 
> ata8.15: Port Multiplier 1.1, 0x1095:0x3726 r23, 6 ports, feat 0x1/0x9
> 
> I'm using Ubuntu 8.10 kernel 2.6.27-11-generic #1 SMP Thu Jan 29
> 19:24:39 UTC 2009 i686 GNU/Linux
> 
> I'm running into all kinds of weird behaviour, like only P1 (port 1
> out of 5) on the PMP working with single drive. Also, it seems to
> differ whether I have a WD or Samsung drive, the WD drive works
> alone in P1 and P2 of the PMP, with the Samsung drive only working
> alone in P1. If I put the Samsung drive in P1 and put the WD drive
> in P3, the P3 drive isn't recognised upon hotplug. If I unplug
> Samsung P1 drive and re-insert it in the same P1 hotswat bay again,
> drives in both P1 and P3 are recognised upon P1 spinning up and
> being recognised.
> 
> Is this a known problem?
> 
> This is perfectly reproducible, I can provide logs if that would
> help.  I'm also willing to try 2.6.29.x if there has been work done
> after 2.6.27.

You need to keep the first port occupied for 3726/4726; otherwise, the
fake config disk jumps around and it just goes belly up.  Do you
experience problems even with the first port occupied?

Thanks.

-- 
tejun

Re: PMPs

[Mikael Abrahamsson]

On Thu, 2 Apr 2009, Tejun Heo wrote:

> You need to keep the first port occupied for 3726/4726; otherwise, the 
> fake config disk jumps around and it just goes belly up.  Do you 
> experience problems even with the first port occupied?

Yes, I just did some tests again (this time with 2.6.28-11-generic 
#41-Ubuntu SMP Wed Apr 8 04:38:53 UTC 2009 i686 GNU/Linux)

If I cold-boot the machine with drives in bay 0 (samsung) and 1 (WD), 
everything is fine. I then unplug the drive in 1, and put it in 2. This 
drive isn't recognised at all (I can't see anything happening in dmesg). 
Re-seating the drive in 0 makes both drives pop back in again.

[   16.558305] ata12.00: ATA-8: SAMSUNG HD501LJ, CR100-10, max UDMA7
[   16.569850] ata12.01: ATA-8: WDC WD5000AAKS-00YGA0, 12.01C02, max UDMA/133
[   16.571285] scsi 11:0:0:0: Direct-Access     ATA      SAMSUNG HD501LJ  CR10 PQ: 0 ANSI: 5
[   16.576818] scsi 11:1:0:0: Direct-Access     ATA      WDC WD5000AAKS-0 12.0 PQ: 0 ANSI: 5

If I now unplug both, and first put in 0 (WD) and then 2(samsung), samsung 
isn't recognised, doesn't matter if I move samsung from 2 to 1. In this 
configuration, 0(WD), 1(samsung), re-seating 0 doesn't make the samsung 
become visible again:

[ 1083.656011] ata12.01: failed to IDENTIFY (I/O error, err_mask=0x11)
[ 1083.656014] ata12.01: failed to recover link after 3 tries, disabling

Removing both and going back to 0 (samsung) and 1 (WD) make both drives 
visible again.

-- 
Mikael Abrahamsson    email: swmike@swm.pp.se

Re: PMPs

[Tejun Heo]

Mikael Abrahamsson wrote:
> On Thu, 2 Apr 2009, Tejun Heo wrote:
> 
>> You need to keep the first port occupied for 3726/4726; otherwise, the
>> fake config disk jumps around and it just goes belly up.  Do you
>> experience problems even with the first port occupied?
> 
> Yes, I just did some tests again (this time with 2.6.28-11-generic
> #41-Ubuntu SMP Wed Apr 8 04:38:53 UTC 2009 i686 GNU/Linux)
> 
> If I cold-boot the machine with drives in bay 0 (samsung) and 1 (WD),
> everything is fine. I then unplug the drive in 1, and put it in 2. This
> drive isn't recognised at all (I can't see anything happening in dmesg).
> Re-seating the drive in 0 makes both drives pop back in again.
> 
> [   16.558305] ata12.00: ATA-8: SAMSUNG HD501LJ, CR100-10, max UDMA7
> [   16.569850] ata12.01: ATA-8: WDC WD5000AAKS-00YGA0, 12.01C02, max
> UDMA/133
> [   16.571285] scsi 11:0:0:0: Direct-Access     ATA      SAMSUNG
> HD501LJ  CR10 PQ: 0 ANSI: 5
> [   16.576818] scsi 11:1:0:0: Direct-Access     ATA      WDC
> WD5000AAKS-0 12.0 PQ: 0 ANSI: 5
> 
> If I now unplug both, and first put in 0 (WD) and then 2(samsung),
> samsung isn't recognised, doesn't matter if I move samsung from 2 to 1.
> In this configuration, 0(WD), 1(samsung), re-seating 0 doesn't make the
> samsung become visible again:
> 
> [ 1083.656011] ata12.01: failed to IDENTIFY (I/O error, err_mask=0x11)
> [ 1083.656014] ata12.01: failed to recover link after 3 tries, disabling
> 
> Removing both and going back to 0 (samsung) and 1 (WD) make both drives
> visible again.

Can you please try 2.6.29 and post full kernel log?

Thanks.

-- 
tejun

Re: PMPs

[Mikael Abrahamsson]

On Tue, 14 Apr 2009, Tejun Heo wrote:

> Can you please try 2.6.29 and post full kernel log?

I have posted a boot time dmesg at <http://swm.pp.se/dmesg090416.txt>

Executive summary of everything that follows below (my opinion of what is 
happening):

If a drive isn't present at boot time in a slot, it's somehow 
"uninitialised". Inserting a drive into a slot not populated before, 
doesn't get detected. If I leave the "undetected" drive, and unplug slot 0 
drive and insert it again, it's now detected and hotplugging of that drive 
works again. I verified this behaviour with slot 2, 3 and 4 below:

So, summary of events (first references the above dmesg file):

At 54s I unplug port1, at 65s I unplug port0, at ~90s I insert same disk 
in port0, at around 120s I insert port1, nothing happens, I then remove 
port0 again, and re-insert it at ~150 or so.

Since I am a bit uncertain about the times above, I'll do it one more time 
and mark each event. State when beginning, both drives are seen.

Unplug port 1:

[  643.891758] ata8.01: exception Emask 0x10 SAct 0x0 SErr 0x4050000 action 0xf
[  643.891763] ata8.01: SError: { PHYRdyChg CommWake DevExch }
[  643.891831] ata8.01: hard resetting link
[  644.616328] ata8.01: SATA link down (SStatus 0 SControl 320)
[  649.616021] ata8.01: hard resetting link
[  649.936351] ata8.01: SATA link down (SStatus 0 SControl 320)
[  649.936416] ata8.01: limiting SATA link speed to 1.5 Gbps
[  654.936038] ata8.01: hard resetting link
[  655.256346] ata8.01: SATA link down (SStatus 0 SControl 310)
[  655.256381] ata8.01: disabled
[  655.256480] ata8: EH complete
[  655.256486] ata8.01: detaching (SCSI 9:1:0:0)
[  655.256808] sd 9:1:0:0: [sdc] Synchronizing SCSI cache
[  655.258065] sd 9:1:0:0: [sdc] Result: hostbyte=DID_BAD_TARGET driverbyte=DRIVER_OK,SUGGEST_OK
[  655.258069] sd 9:1:0:0: [sdc] Stopping disk
[  655.258075] sd 9:1:0:0: [sdc] START_STOP FAILED
[  655.258077] sd 9:1:0:0: [sdc] Result: hostbyte=DID_BAD_TARGET driverbyte=DRIVER_OK,SUGGEST_OK

Insert drive 1:

[  700.214554] ata8.01: exception Emask 0x10 SAct 0x0 SErr 0x4050000 action 0xf
[  700.214559] ata8.01: SError: { PHYRdyChg CommWake DevExch }
[  700.214633] ata8.01: hard resetting link
[  700.936351] ata8.01: SATA link up 3.0 Gbps (SStatus 123 SControl 320)
[  701.048018] ata8.01: failed to IDENTIFY (I/O error, err_mask=0x11)
[  701.048023] ata8.15: hard resetting link
[  701.048025] ata8: controller in dubious state, performing PORT_RST
[  703.280039] ata8.15: SATA link up 3.0 Gbps (SStatus 123 SControl 0)
[  703.280282] ata8.00: hard resetting link
[  703.600344] ata8.00: SATA link up 3.0 Gbps (SStatus 123 SControl 320)
[  705.936009] ata8.01: hard resetting link
[  706.256343] ata8.01: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
[  706.256348] ata8.02: hard resetting link
[  706.576326] ata8.02: SATA link down (SStatus 0 SControl 320)
[  706.576331] ata8.03: hard resetting link
[  706.896350] ata8.03: SATA link down (SStatus 0 SControl 320)
[  706.896355] ata8.04: hard resetting link
[  707.216351] ata8.04: SATA link down (SStatus 0 SControl 320)
[  707.216356] ata8.05: hard resetting link
[  707.536348] ata8.05: SATA link up 1.5 Gbps (SStatus 113 SControl 320)
[  707.545142] ata8.00: configured for UDMA/100
[  707.656528] ata8.01: failed to IDENTIFY (I/O error, err_mask=0x11)
[  707.656533] ata8.15: hard resetting link
[  707.656535] ata8: controller in dubious state, performing PORT_RST
[  709.888550] ata8.15: SATA link up 3.0 Gbps (SStatus 123 SControl 0)
[  709.888791] ata8.00: hard resetting link
[  710.208845] ata8.00: SATA link up 3.0 Gbps (SStatus 123 SControl 320)
[  711.257020] ata8.01: hard resetting link
[  711.576370] ata8.01: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
[  712.537019] ata8.05: hard resetting link
[  712.856333] ata8.05: SATA link up 1.5 Gbps (SStatus 113 SControl 320)
[  712.878925] ata8.00: configured for UDMA/100
[  712.888057] ata8.01: ATA-8: WDC WD5000AAKS-00YGA0, 12.01C02, max UDMA/133
[  712.888061] ata8.01: 976773168 sectors, multi 0: LBA48 NCQ (depth 31/32)
[  712.888988] ata8.01: configured for UDMA/100
[  712.889363] ata8: EH complete
[  712.889392] sd 9:0:0:0: [sdb] 976773168 512-byte hardware sectors: (500 GB/465 GiB)
[  712.889408] sd 9:0:0:0: [sdb] Write Protect is off
[  712.889414] sd 9:0:0:0: [sdb] Mode Sense: 00 3a 00 00
[  712.889435] sd 9:0:0:0: [sdb] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
[  712.889460] sd 9:0:0:0: [sdb] 976773168 512-byte hardware sectors: (500 GB/465 GiB)
[  712.889475] sd 9:0:0:0: [sdb] Write Protect is off
[  712.889480] sd 9:0:0:0: [sdb] Mode Sense: 00 3a 00 00
[  712.889500] sd 9:0:0:0: [sdb] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
[  712.889559] scsi 9:1:0:0: Direct-Access     ATA      WDC WD5000AAKS-0 12.0 PQ: 0 ANSI: 5
[  712.890195] sd 9:1:0:0: [sdc] 976773168 512-byte hardware sectors: (500 GB/465 GiB)
[  712.890211] sd 9:1:0:0: [sdc] Write Protect is off
[  712.890216] sd 9:1:0:0: [sdc] Mode Sense: 00 3a 00 00
[  712.890236] sd 9:1:0:0: [sdc] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
[  712.890291] sd 9:1:0:0: [sdc] 976773168 512-byte hardware sectors: (500 GB/465 GiB)
[  712.890306] sd 9:1:0:0: [sdc] Write Protect is off
[  712.890311] sd 9:1:0:0: [sdc] Mode Sense: 00 3a 00 00
[  712.890332] sd 9:1:0:0: [sdc] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
[  712.890340]  sdc: sdc1 sdc2 sdc3 sdc4
[  712.899432] sd 9:1:0:0: [sdc] Attached SCSI disk
[  712.899481] sd 9:1:0:0: Attached scsi generic sg2 type 0

Hm, so now it worked for some reason.

I unplug port1 again:

[  778.054235] ata8.01: exception Emask 0x10 SAct 0x0 SErr 0x4050000 action 0xf
[  778.054240] ata8.01: SError: { PHYRdyChg CommWake DevExch }
[  778.054308] ata8.01: hard resetting link
[  778.776330] ata8.01: SATA link down (SStatus 0 SControl 320)
[  783.776010] ata8.01: hard resetting link
[  784.096341] ata8.01: SATA link down (SStatus 0 SControl 320)
[  784.096406] ata8.01: limiting SATA link speed to 1.5 Gbps
[  789.096019] ata8.01: hard resetting link
[  789.416352] ata8.01: SATA link down (SStatus 0 SControl 310)
[  789.416387] ata8.01: disabled
[  789.416482] ata8: EH complete
[  789.416492] ata8.01: detaching (SCSI 9:1:0:0)
[  789.416839] sd 9:1:0:0: [sdc] Synchronizing SCSI cache
[  789.417758] sd 9:1:0:0: [sdc] Result: hostbyte=DID_BAD_TARGET driverbyte=DRIVER_OK,SUGGEST_OK
[  789.417762] sd 9:1:0:0: [sdc] Stopping disk
[  789.417769] sd 9:1:0:0: [sdc] START_STOP FAILED
[  789.417770] sd 9:1:0:0: [sdc] Result: hostbyte=DID_BAD_TARGET driverbyte=DRIVER_OK,SUGGEST_OK

I put it in port 2 (hm, I'm a bit unsure this is correct, it seems that I 
might have done something else here, after inserting into slot 2 drive 
isn't visible anyway):

[  842.604261] ata8.01: exception Emask 0x10 SAct 0x0 SErr 0x4010000 
action 0xf
[  842.604267] ata8.01: SError: { PHYRdyChg DevExch }
[  842.604334] ata8.01: hard resetting link
[  843.328351] ata8.01: SATA link down (SStatus 0 SControl 320)
[  848.328014] ata8.01: hard resetting link
[  848.648327] ata8.01: SATA link down (SStatus 0 SControl 320)
[  848.648390] ata8.01: limiting SATA link speed to 1.5 Gbps
[  853.648009] ata8.01: hard resetting link
[  853.968354] ata8.01: SATA link down (SStatus 0 SControl 310)
[  853.968389] ata8.01: disabled
[  853.968487] ata8: EH complete
[  853.968496] ata8.01: detaching (SCSI 9:1:0:0)
[  853.968843] sd 9:1:0:0: [sdc] Synchronizing SCSI cache
[  853.969629] sd 9:1:0:0: [sdc] Result: hostbyte=DID_BAD_TARGET driverbyte=DRIVER_OK,SUGGEST_OK
[  853.969633] sd 9:1:0:0: [sdc] Stopping disk
[  853.969640] sd 9:1:0:0: [sdc] START_STOP FAILED
[  853.969641] sd 9:1:0:0: [sdc] Result: hostbyte=DID_BAD_TARGET driverbyte=DRIVER_OK,SUGGEST_OK

(now I got interrupted by a phone call, but the drive is in port 2, fdisk 
doesn't show any sdc drive)

I then unplug port 0:

[ 2321.457367] ata8.00: exception Emask 0x10 SAct 0x0 SErr 0x4010000 action 0xf
[ 2321.457372] ata8.00: SError: { PHYRdyChg DevExch }
[ 2321.457439] ata8.00: hard resetting link
[ 2322.180327] ata8.00: SATA link down (SStatus 0 SControl 320)
[ 2327.180011] ata8.00: hard resetting link
[ 2327.500352] ata8.00: SATA link down (SStatus 0 SControl 320)
[ 2327.500424] ata8.00: limiting SATA link speed to 1.5 Gbps
[ 2332.500010] ata8.00: hard resetting link
[ 2332.820325] ata8.00: SATA link down (SStatus 0 SControl 310)
[ 2332.820361] ata8.00: disabled
[ 2332.820465] ata8: EH complete
[ 2332.820470] ata8.00: detaching (SCSI 9:0:0:0)
[ 2332.820711] sd 9:0:0:0: [sdb] Synchronizing SCSI cache
[ 2332.821381] sd 9:0:0:0: [sdb] Result: hostbyte=DID_BAD_TARGET driverbyte=DRIVER_OK,SUGGEST_OK
[ 2332.821385] sd 9:0:0:0: [sdb] Stopping disk
[ 2332.821392] sd 9:0:0:0: [sdb] START_STOP FAILED
[ 2332.821393] sd 9:0:0:0: [sdb] Result: hostbyte=DID_BAD_TARGET driverbyte=DRIVER_OK,SUGGEST_OK

And insert port 0 again (without touching port 2)

[ 2434.688051] ata8.00: exception Emask 0x10 SAct 0x0 SErr 0x4050000 action 0xf
[ 2434.688056] ata8.00: SError: { PHYRdyChg CommWake DevExch }
[ 2434.688126] ata8.00: hard resetting link
[ 2435.412327] ata8.00: SATA link up 3.0 Gbps (SStatus 123 SControl 320)
[ 2435.524018] ata8.00: failed to IDENTIFY (I/O error, err_mask=0x11)
[ 2435.524024] ata8.15: hard resetting link
[ 2435.524026] ata8: controller in dubious state, performing PORT_RST
[ 2437.756039] ata8.15: SATA link up 3.0 Gbps (SStatus 123 SControl 0)
[ 2440.412009] ata8.00: hard resetting link
[ 2440.732339] ata8.00: SATA link up 3.0 Gbps (SStatus 123 SControl 320)
[ 2440.732344] ata8.01: hard resetting link
[ 2441.052327] ata8.01: SATA link down (SStatus 0 SControl 320)
[ 2441.052332] ata8.02: hard resetting link
[ 2441.372352] ata8.02: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
[ 2441.372357] ata8.03: hard resetting link
[ 2441.692335] ata8.03: SATA link down (SStatus 0 SControl 320)
[ 2441.692340] ata8.04: hard resetting link
[ 2442.012349] ata8.04: SATA link down (SStatus 0 SControl 320)
[ 2442.012353] ata8.05: hard resetting link
[ 2442.332353] ata8.05: SATA link up 1.5 Gbps (SStatus 113 SControl 320)
[ 2442.444018] ata8.00: failed to IDENTIFY (I/O error, err_mask=0x11)
[ 2442.444022] ata8.15: hard resetting link
[ 2442.444025] ata8: controller in dubious state, performing PORT_RST
[ 2444.676039] ata8.15: SATA link up 3.0 Gbps (SStatus 123 SControl 0)
[ 2445.732012] ata8.00: hard resetting link
[ 2446.052351] ata8.00: SATA link up 3.0 Gbps (SStatus 123 SControl 320)
[ 2446.372010] ata8.02: hard resetting link
[ 2446.692342] ata8.02: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
[ 2447.332011] ata8.05: hard resetting link
[ 2447.652327] ata8.05: SATA link up 1.5 Gbps (SStatus 113 SControl 320)
[ 2447.664104] ata8.00: ATA-8: SAMSUNG HD501LJ, CR100-10, max UDMA7
[ 2447.664108] ata8.00: 976773168 sectors, multi 0: LBA48 NCQ (depth 31/32)
[ 2447.666162] ata8.00: configured for UDMA/100
[ 2447.677536] ata8.02: ATA-8: WDC WD5000AAKS-00YGA0, 12.01C02, max UDMA/133
[ 2447.677539] ata8.02: 976773168 sectors, multi 0: LBA48 NCQ (depth 31/32)
[ 2447.678487] ata8.02: configured for UDMA/100
[ 2447.678853] ata8: EH complete
[ 2447.678936] scsi 9:0:0:0: Direct-Access     ATA      SAMSUNG HD501LJ  CR10 PQ: 0 ANSI: 5
[ 2447.679618] sd 9:0:0:0: [sdb] 976773168 512-byte hardware sectors: (500 GB/465 GiB)
[ 2447.679630] sd 9:0:0:0: [sdb] Write Protect is off
[ 2447.679632] sd 9:0:0:0: [sdb] Mode Sense: 00 3a 00 00
[ 2447.679649] sd 9:0:0:0: [sdb] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
[ 2447.679699] sd 9:0:0:0: [sdb] 976773168 512-byte hardware sectors: (500 GB/465 GiB)
[ 2447.679709] sd 9:0:0:0: [sdb] Write Protect is off
[ 2447.679710] sd 9:0:0:0: [sdb] Mode Sense: 00 3a 00 00
[ 2447.679727] sd 9:0:0:0: [sdb] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
[ 2447.679730]  sdb: sdb1
[ 2447.685145] sd 9:0:0:0: [sdb] Attached SCSI disk
[ 2447.685198] sd 9:0:0:0: Attached scsi generic sg1 type 0
[ 2447.685285] scsi 9:2:0:0: Direct-Access     ATA      WDC WD5000AAKS-0 12.0 PQ: 0 ANSI: 5
[ 2447.685395] sd 9:2:0:0: [sdc] 976773168 512-byte hardware sectors: (500 GB/465 GiB)
[ 2447.685406] sd 9:2:0:0: [sdc] Write Protect is off
[ 2447.685408] sd 9:2:0:0: [sdc] Mode Sense: 00 3a 00 00
[ 2447.685425] sd 9:2:0:0: [sdc] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
[ 2447.685486] sd 9:2:0:0: [sdc] 976773168 512-byte hardware sectors: (500 GB/465 GiB)
[ 2447.685496] sd 9:2:0:0: [sdc] Write Protect is off
[ 2447.685497] sd 9:2:0:0: [sdc] Mode Sense: 00 3a 00 00
[ 2447.685514] sd 9:2:0:0: [sdc] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
[ 2447.685516]  sdc: sdc1 sdc2 sdc3 sdc4
[ 2447.697161] sd 9:2:0:0: [sdc] Attached SCSI disk
[ 2447.697213] sd 9:2:0:0: Attached scsi generic sg2 type 0

So now both drives are visible again:

I unplug port 2:

[ 2544.467211] ata8.02: exception Emask 0x10 SAct 0x0 SErr 0x4010000 action 0xf
[ 2544.467217] ata8.02: SError: { PHYRdyChg DevExch }
[ 2544.467291] ata8.02: hard resetting link
[ 2545.188325] ata8.02: SATA link down (SStatus 0 SControl 320)
[ 2550.188026] ata8.02: hard resetting link
[ 2550.508351] ata8.02: SATA link down (SStatus 0 SControl 320)
[ 2550.508424] ata8.02: limiting SATA link speed to 1.5 Gbps
[ 2555.508019] ata8.02: hard resetting link
[ 2555.828350] ata8.02: SATA link down (SStatus 0 SControl 310)
[ 2555.828385] ata8.02: disabled
[ 2555.828482] ata8: EH complete
[ 2555.828487] ata8.02: detaching (SCSI 9:2:0:0)
[ 2555.828837] sd 9:2:0:0: [sdc] Synchronizing SCSI cache
[ 2555.829165] sd 9:2:0:0: [sdc] Result: hostbyte=DID_BAD_TARGET driverbyte=DRIVER_OK,SUGGEST_OK
[ 2555.829168] sd 9:2:0:0: [sdc] Stopping disk
[ 2555.829175] sd 9:2:0:0: [sdc] START_STOP FAILED
[ 2555.829176] sd 9:2:0:0: [sdc] Result: hostbyte=DID_BAD_TARGET driverbyte=DRIVER_OK,SUGGEST_OK

and insert it again:

[ 2583.535671] ata8.02: exception Emask 0x10 SAct 0x0 SErr 0x4050000 
action 0xf
[ 2583.535676] ata8.02: SError: { PHYRdyChg CommWake DevExch }
[ 2583.535745] ata8.02: hard resetting link
[ 2584.256347] ata8.02: SATA link up 3.0 Gbps (SStatus 123 SControl 320)
[ 2584.368019] ata8.02: failed to IDENTIFY (I/O error, err_mask=0x11)
[ 2584.368024] ata8.15: hard resetting link
[ 2584.368026] ata8: controller in dubious state, performing PORT_RST
[ 2586.600039] ata8.15: SATA link up 3.0 Gbps (SStatus 123 SControl 0)
[ 2586.600287] ata8.00: hard resetting link
[ 2586.920342] ata8.00: SATA link up 3.0 Gbps (SStatus 123 SControl 320)
[ 2586.920347] ata8.01: hard resetting link
[ 2587.240340] ata8.01: SATA link down (SStatus 0 SControl 320)
[ 2589.256008] ata8.02: hard resetting link
[ 2589.576327] ata8.02: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
[ 2589.576332] ata8.03: hard resetting link
[ 2589.896343] ata8.03: SATA link down (SStatus 0 SControl 320)
[ 2589.896347] ata8.04: hard resetting link
[ 2590.216324] ata8.04: SATA link down (SStatus 0 SControl 320)
[ 2590.216329] ata8.05: hard resetting link
[ 2590.536352] ata8.05: SATA link up 1.5 Gbps (SStatus 113 SControl 320)
[ 2590.558972] ata8.00: configured for UDMA/100
[ 2590.669019] ata8.02: failed to IDENTIFY (I/O error, err_mask=0x11)
[ 2590.669023] ata8.15: hard resetting link
[ 2590.669026] ata8: controller in dubious state, performing PORT_RST
[ 2592.901040] ata8.15: SATA link up 3.0 Gbps (SStatus 123 SControl 0)
[ 2592.901291] ata8.00: hard resetting link
[ 2593.221323] ata8.00: SATA link up 3.0 Gbps (SStatus 123 SControl 320)
[ 2593.221327] ata8.01: hard resetting link
[ 2593.540357] ata8.01: SATA link down (SStatus 0 SControl 320)
[ 2594.577017] ata8.02: hard resetting link
[ 2594.897334] ata8.02: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
[ 2595.537018] ata8.05: hard resetting link
[ 2595.856356] ata8.05: SATA link up 1.5 Gbps (SStatus 113 SControl 320)
[ 2595.878945] ata8.00: configured for UDMA/100
[ 2595.886571] ata8.02: ATA-8: WDC WD5000AAKS-00YGA0, 12.01C02, max 
UDMA/133
[ 2595.886575] ata8.02: 976773168 sectors, multi 0: LBA48 NCQ (depth 
31/32)
[ 2595.887523] ata8.02: configured for UDMA/100
[ 2595.887890] ata8: EH complete
[ 2595.887937] sd 9:0:0:0: [sdb] 976773168 512-byte hardware sectors: (500 
GB/465 GiB)
[ 2595.887955] sd 9:0:0:0: [sdb] Write Protect is off
[ 2595.887958] sd 9:0:0:0: [sdb] Mode Sense: 00 3a 00 00
[ 2595.887983] sd 9:0:0:0: [sdb] Write cache: enabled, read cache: 
enabled, doesn't support DPO or FUA
[ 2595.888013] sd 9:0:0:0: [sdb] 976773168 512-byte hardware sectors: (500 
GB/465 GiB)
[ 2595.888028] sd 9:0:0:0: [sdb] Write Protect is off
[ 2595.888030] sd 9:0:0:0: [sdb] Mode Sense: 00 3a 00 00
[ 2595.888055] sd 9:0:0:0: [sdb] Write cache: enabled, read cache: 
enabled, doesn't support DPO or FUA
[ 2595.888114] scsi 9:2:0:0: Direct-Access     ATA      WDC WD5000AAKS-0 
12.0 PQ: 0 ANSI: 5
[ 2595.888450] sd 9:2:0:0: [sdc] 976773168 512-byte hardware sectors: (500 
GB/465 GiB)
[ 2595.888461] sd 9:2:0:0: [sdc] Write Protect is off
[ 2595.888463] sd 9:2:0:0: [sdc] Mode Sense: 00 3a 00 00
[ 2595.888479] sd 9:2:0:0: [sdc] Write cache: enabled, read cache: 
enabled, doesn't support DPO or FUA
[ 2595.888529] sd 9:2:0:0: [sdc] 976773168 512-byte hardware sectors: (500 
GB/465 GiB)
[ 2595.888544] sd 9:2:0:0: [sdc] Write Protect is off
[ 2595.888545] sd 9:2:0:0: [sdc] Mode Sense: 00 3a 00 00
[ 2595.890701] sd 9:2:0:0: [sdc] Write cache: enabled, read cache: 
enabled, doesn't support DPO or FUA
[ 2595.890705]  sdc: sdc1 sdc2 sdc3 sdc4
[ 2595.906229] sd 9:2:0:0: [sdc] Attached SCSI disk
[ 2595.906278] sd 9:2:0:0: Attached scsi generic sg2 type 0

Unplug port 2:

  2622.989543] ata8.02: exception Emask 0x10 SAct 0x0 SErr 0x4010000 action 0xf
[ 2622.989549] ata8.02: SError: { PHYRdyChg DevExch }
[ 2622.989617] ata8.02: hard resetting link
[ 2623.712341] ata8.02: SATA link down (SStatus 0 SControl 320)
[ 2628.712011] ata8.02: hard resetting link
[ 2629.032325] ata8.02: SATA link down (SStatus 0 SControl 320)
[ 2629.032387] ata8.02: limiting SATA link speed to 1.5 Gbps
[ 2634.032027] ata8.02: hard resetting link
[ 2634.352350] ata8.02: SATA link down (SStatus 0 SControl 310)
[ 2634.352385] ata8.02: disabled
[ 2634.352483] ata8: EH complete
[ 2634.352493] ata8.02: detaching (SCSI 9:2:0:0)
[ 2634.352839] sd 9:2:0:0: [sdc] Synchronizing SCSI cache
[ 2634.353647] sd 9:2:0:0: [sdc] Result: hostbyte=DID_BAD_TARGET driverbyte=DRIVER_OK,SUGGEST_OK
[ 2634.353651] sd 9:2:0:0: [sdc] Stopping disk
[ 2634.353657] sd 9:2:0:0: [sdc] START_STOP FAILED

and put it in port 3, nothing happens.

I remove it from port 3 and put it back in, still nothing happens.

I remove it from port 3 and put it in port 2:

[ 2780.275439] ata8.02: exception Emask 0x10 SAct 0x0 SErr 0x4050000 
action 0xf
[ 2780.275444] ata8.02: SError: { PHYRdyChg CommWake DevExch }
[ 2780.275511] ata8.02: hard resetting link
[ 2780.996352] ata8.02: SATA link up 3.0 Gbps (SStatus 123 SControl 320)
[ 2781.108018] ata8.02: failed to IDENTIFY (I/O error, err_mask=0x11)
[ 2781.108024] ata8.15: hard resetting link
[ 2781.108026] ata8: controller in dubious state, performing PORT_RST
[ 2783.340039] ata8.15: SATA link up 3.0 Gbps (SStatus 123 SControl 0)
[ 2783.340285] ata8.00: hard resetting link
[ 2783.660341] ata8.00: SATA link up 3.0 Gbps (SStatus 123 SControl 320)
[ 2783.660346] ata8.01: hard resetting link
[ 2783.980325] ata8.01: SATA link down (SStatus 0 SControl 320)
[ 2785.996027] ata8.02: hard resetting link
[ 2786.316349] ata8.02: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
[ 2786.316354] ata8.03: hard resetting link
[ 2786.636326] ata8.03: SATA link down (SStatus 0 SControl 320)
[ 2786.636331] ata8.04: hard resetting link
[ 2786.956343] ata8.04: SATA link down (SStatus 0 SControl 320)
[ 2786.956347] ata8.05: hard resetting link
[ 2787.276333] ata8.05: SATA link up 1.5 Gbps (SStatus 113 SControl 320)
[ 2787.281951] ata8.00: configured for UDMA/100
[ 2787.392049] ata8.02: failed to IDENTIFY (I/O error, err_mask=0x11)
[ 2787.392053] ata8.15: hard resetting link
[ 2787.392056] ata8: controller in dubious state, performing PORT_RST
[ 2789.624059] ata8.15: SATA link up 3.0 Gbps (SStatus 123 SControl 0)
[ 2789.624317] ata8.00: hard resetting link
[ 2789.944349] ata8.00: SATA link up 3.0 Gbps (SStatus 123 SControl 320)
[ 2789.944353] ata8.01: hard resetting link
[ 2790.264323] ata8.01: SATA link down (SStatus 0 SControl 320)
[ 2791.316407] ata8.02: hard resetting link
[ 2791.636349] ata8.02: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
[ 2792.276017] ata8.05: hard resetting link
[ 2792.596344] ata8.05: SATA link up 1.5 Gbps (SStatus 113 SControl 320)
[ 2792.618938] ata8.00: configured for UDMA/100
[ 2792.639846] ata8.02: ATA-8: WDC WD5000AAKS-00YGA0, 12.01C02, max 
UDMA/133
[ 2792.639849] ata8.02: 976773168 sectors, multi 0: LBA48 NCQ (depth 
31/32)
[ 2792.640763] ata8.02: configured for UDMA/100
[ 2792.641166] ata8: EH complete
[ 2792.641203] sd 9:0:0:0: [sdb] 976773168 512-byte hardware sectors: (500 
GB/465 GiB)
[ 2792.641220] sd 9:0:0:0: [sdb] Write Protect is off
[ 2792.641223] sd 9:0:0:0: [sdb] Mode Sense: 00 3a 00 00
[ 2792.641248] sd 9:0:0:0: [sdb] Write cache: enabled, read cache: 
enabled, doesn't support DPO or FUA
[ 2792.641277] sd 9:0:0:0: [sdb] 976773168 512-byte hardware sectors: (500 
GB/465 GiB)
[ 2792.641292] sd 9:0:0:0: [sdb] Write Protect is off
[ 2792.641295] sd 9:0:0:0: [sdb] Mode Sense: 00 3a 00 00
[ 2792.641319] sd 9:0:0:0: [sdb] Write cache: enabled, read cache: 
enabled, doesn't support DPO or FUA
[ 2792.641392] scsi 9:2:0:0: Direct-Access     ATA      WDC WD5000AAKS-0 
12.0 PQ: 0 ANSI: 5
[ 2792.642033] sd 9:2:0:0: [sdc] 976773168 512-byte hardware sectors: (500 
GB/465 GiB)
[ 2792.642044] sd 9:2:0:0: [sdc] Write Protect is off
[ 2792.642046] sd 9:2:0:0: [sdc] Mode Sense: 00 3a 00 00
[ 2792.642062] sd 9:2:0:0: [sdc] Write cache: enabled, read cache: 
enabled, doesn't support DPO or FUA
[ 2792.642112] sd 9:2:0:0: [sdc] 976773168 512-byte hardware sectors: (500 
GB/465 GiB)
[ 2792.642122] sd 9:2:0:0: [sdc] Write Protect is off
[ 2792.642123] sd 9:2:0:0: [sdc] Mode Sense: 00 3a 00 00
[ 2792.642140] sd 9:2:0:0: [sdc] Write cache: enabled, read cache: 
enabled, doesn't support DPO or FUA
[ 2792.642143]  sdc: sdc1 sdc2 sdc3 sdc4
[ 2792.651191] sd 9:2:0:0: [sdc] Attached SCSI disk
[ 2792.651243] sd 9:2:0:0: Attached scsi generic sg2 type 0

Remove it again:

[ 2828.634009] ata8.02: exception Emask 0x10 SAct 0x0 SErr 0x4010000 
action 0xf
[ 2828.634014] ata8.02: SError: { PHYRdyChg DevExch }
[ 2828.634082] ata8.02: hard resetting link
[ 2829.356350] ata8.02: SATA link down (SStatus 0 SControl 320)
[ 2834.356010] ata8.02: hard resetting link
[ 2834.676328] ata8.02: SATA link down (SStatus 0 SControl 320)
[ 2834.676391] ata8.02: limiting SATA link speed to 1.5 Gbps
[ 2839.676011] ata8.02: hard resetting link
[ 2839.996334] ata8.02: SATA link down (SStatus 0 SControl 310)
[ 2839.996368] ata8.02: disabled
[ 2839.996464] ata8: EH complete
[ 2839.996468] ata8.02: detaching (SCSI 9:2:0:0)
[ 2839.996795] sd 9:2:0:0: [sdc] Synchronizing SCSI cache
[ 2839.998377] sd 9:2:0:0: [sdc] Result: hostbyte=DID_BAD_TARGET 
driverbyte=DRIVER_OK,SUGGEST_OK
[ 2839.998382] sd 9:2:0:0: [sdc] Stopping disk
[ 2839.998388] sd 9:2:0:0: [sdc] START_STOP FAILED
[ 2839.998389] sd 9:2:0:0: [sdc] Result: hostbyte=DID_BAD_TARGET 
driverbyte=DRIVER_OK,SUGGEST_OK

Put it back in:

[ 2861.359940] ata8.02: exception Emask 0x10 SAct 0x0 SErr 0x4050000 
action 0xf
[ 2861.359946] ata8.02: SError: { PHYRdyChg CommWake DevExch }
[ 2861.360015] ata8.02: hard resetting link
[ 2862.084324] ata8.02: SATA link up 3.0 Gbps (SStatus 123 SControl 320)
[ 2862.196018] ata8.02: failed to IDENTIFY (I/O error, err_mask=0x11)
[ 2862.196023] ata8.15: hard resetting link
[ 2862.196026] ata8: controller in dubious state, performing PORT_RST
[ 2864.428038] ata8.15: SATA link up 3.0 Gbps (SStatus 123 SControl 0)
[ 2864.428281] ata8.00: hard resetting link
[ 2864.748324] ata8.00: SATA link up 3.0 Gbps (SStatus 123 SControl 320)
[ 2864.748329] ata8.01: hard resetting link
[ 2865.068335] ata8.01: SATA link down (SStatus 0 SControl 320)
[ 2867.084016] ata8.02: hard resetting link
[ 2867.404340] ata8.02: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
[ 2867.404345] ata8.03: hard resetting link
[ 2867.724323] ata8.03: SATA link down (SStatus 0 SControl 320)
[ 2867.724327] ata8.04: hard resetting link
[ 2868.044337] ata8.04: SATA link down (SStatus 0 SControl 320)
[ 2868.044342] ata8.05: hard resetting link
[ 2868.364343] ata8.05: SATA link up 1.5 Gbps (SStatus 113 SControl 320)
[ 2868.386951] ata8.00: configured for UDMA/100
[ 2868.497523] ata8.02: failed to IDENTIFY (I/O error, err_mask=0x11)
[ 2868.497527] ata8.15: hard resetting link
[ 2868.497530] ata8: controller in dubious state, performing PORT_RST
[ 2870.729542] ata8.15: SATA link up 3.0 Gbps (SStatus 123 SControl 0)
[ 2870.729783] ata8.00: hard resetting link
[ 2871.053843] ata8.00: SATA link up 3.0 Gbps (SStatus 123 SControl 320)
[ 2871.053847] ata8.01: hard resetting link
[ 2871.385345] ata8.01: SATA link down (SStatus 0 SControl 320)
[ 2872.404009] ata8.02: hard resetting link
[ 2872.724320] ata8.02: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
[ 2873.365529] ata8.05: hard resetting link
[ 2873.684319] ata8.05: SATA link up 1.5 Gbps (SStatus 113 SControl 320)
[ 2873.706915] ata8.00: configured for UDMA/100
[ 2873.716621] ata8.02: ATA-8: WDC WD5000AAKS-00YGA0, 12.01C02, max 
UDMA/133
[ 2873.716625] ata8.02: 976773168 sectors, multi 0: LBA48 NCQ (depth 
31/32)
[ 2873.717577] ata8.02: configured for UDMA/100
[ 2873.717950] ata8: EH complete
[ 2873.717981] sd 9:0:0:0: [sdb] 976773168 512-byte hardware sectors: (500 
GB/465 GiB)
[ 2873.717993] sd 9:0:0:0: [sdb] Write Protect is off
[ 2873.717994] sd 9:0:0:0: [sdb] Mode Sense: 00 3a 00 00
[ 2873.718011] sd 9:0:0:0: [sdb] Write cache: enabled, read cache: 
enabled, doesn't support DPO or FUA
[ 2873.718032] sd 9:0:0:0: [sdb] 976773168 512-byte hardware sectors: (500 
GB/465 GiB)
[ 2873.718042] sd 9:0:0:0: [sdb] Write Protect is off
[ 2873.718044] sd 9:0:0:0: [sdb] Mode Sense: 00 3a 00 00
[ 2873.718060] sd 9:0:0:0: [sdb] Write cache: enabled, read cache: 
enabled, doesn't support DPO or FUA
[ 2873.718113] scsi 9:2:0:0: Direct-Access     ATA      WDC WD5000AAKS-0 
12.0 PQ: 0 ANSI: 5
[ 2873.718428] sd 9:2:0:0: [sdc] 976773168 512-byte hardware sectors: (500 
GB/465 GiB)
[ 2873.718439] sd 9:2:0:0: [sdc] Write Protect is off
[ 2873.718441] sd 9:2:0:0: [sdc] Mode Sense: 00 3a 00 00
[ 2873.718458] sd 9:2:0:0: [sdc] Write cache: enabled, read cache: 
enabled, doesn't support DPO or FUA
[ 2873.718510] sd 9:2:0:0: [sdc] 976773168 512-byte hardware sectors: (500 
GB/465 GiB)
[ 2873.718520] sd 9:2:0:0: [sdc] Write Protect is off
[ 2873.718522] sd 9:2:0:0: [sdc] Mode Sense: 00 3a 00 00
[ 2873.718539] sd 9:2:0:0: [sdc] Write cache: enabled, read cache: 
enabled, doesn't support DPO or FUA
[ 2873.718542]  sdc: sdc1 sdc2 sdc3 sdc4
[ 2873.727984] sd 9:2:0:0: [sdc] Attached SCSI disk

Remove it from slot 2, put it in slot 3:

nothing happens (apart from that the disconnection from slot 2 is 
detected)

I unplug port 0:

[ 2948.904873] ata8.00: exception Emask 0x10 SAct 0x0 SErr 0x4010000 
action 0xf
[ 2948.904879] ata8.00: SError: { PHYRdyChg DevExch }
[ 2948.904946] ata8.00: hard resetting link
[ 2949.628361] ata8.00: SATA link down (SStatus 0 SControl 320)
[ 2954.628015] ata8.00: hard resetting link
[ 2954.948351] ata8.00: SATA link down (SStatus 0 SControl 320)
[ 2954.948413] ata8.00: limiting SATA link speed to 1.5 Gbps
[ 2959.948012] ata8.00: hard resetting link
[ 2960.268324] ata8.00: SATA link down (SStatus 0 SControl 310)
[ 2960.268359] ata8.00: disabled
[ 2960.268455] ata8: EH complete
[ 2960.268460] ata8.00: detaching (SCSI 9:0:0:0)
[ 2960.268714] sd 9:0:0:0: [sdb] Synchronizing SCSI cache
[ 2960.268738] sd 9:0:0:0: [sdb] Result: hostbyte=DID_BAD_TARGET 
driverbyte=DRIVER_OK,SUGGEST_OK
[ 2960.268741] sd 9:0:0:0: [sdb] Stopping disk
[ 2960.268747] sd 9:0:0:0: [sdb] START_STOP FAILED
[ 2960.268748] sd 9:0:0:0: [sdb] Result: hostbyte=DID_BAD_TARGET 
driverbyte=DRIVER_OK,SUGGEST_OK

and put it back in again:

[ 2988.556210] ata8.00: exception Emask 0x10 SAct 0x0 SErr 0x4050000 
action 0xf
[ 2988.556215] ata8.00: SError: { PHYRdyChg CommWake DevExch }
[ 2988.556298] ata8.00: hard resetting link
[ 2989.280352] ata8.00: SATA link up 3.0 Gbps (SStatus 123 SControl 320)
[ 2989.392018] ata8.00: failed to IDENTIFY (I/O error, err_mask=0x11)
[ 2989.392023] ata8.15: hard resetting link
[ 2989.392026] ata8: controller in dubious state, performing PORT_RST
[ 2991.624039] ata8.15: SATA link up 3.0 Gbps (SStatus 123 SControl 0)
[ 2994.280009] ata8.00: hard resetting link
[ 2994.600351] ata8.00: SATA link up 3.0 Gbps (SStatus 123 SControl 320)
[ 2994.600356] ata8.01: hard resetting link
[ 2994.920335] ata8.01: SATA link down (SStatus 0 SControl 320)
[ 2994.920339] ata8.02: hard resetting link
[ 2995.240342] ata8.02: SATA link down (SStatus 0 SControl 320)
[ 2995.240346] ata8.03: hard resetting link
[ 2995.560350] ata8.03: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
[ 2995.560355] ata8.04: hard resetting link
[ 2995.880333] ata8.04: SATA link down (SStatus 0 SControl 320)
[ 2995.880337] ata8.05: hard resetting link
[ 2996.200348] ata8.05: SATA link up 1.5 Gbps (SStatus 113 SControl 320)
[ 2996.312018] ata8.00: failed to IDENTIFY (I/O error, err_mask=0x11)
[ 2996.312022] ata8.15: hard resetting link
[ 2996.312025] ata8: controller in dubious state, performing PORT_RST
[ 2998.544039] ata8.15: SATA link up 3.0 Gbps (SStatus 123 SControl 0)
[ 2999.600011] ata8.00: hard resetting link
[ 2999.920349] ata8.00: SATA link up 3.0 Gbps (SStatus 123 SControl 320)
[ 3000.560017] ata8.03: hard resetting link
[ 3000.880348] ata8.03: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
[ 3001.200010] ata8.05: hard resetting link
[ 3001.520325] ata8.05: SATA link up 1.5 Gbps (SStatus 113 SControl 320)
[ 3001.522278] ata8.00: ATA-8: SAMSUNG HD501LJ, CR100-10, max UDMA7
[ 3001.522282] ata8.00: 976773168 sectors, multi 0: LBA48 NCQ (depth 
31/32)
[ 3001.524349] ata8.00: configured for UDMA/100
[ 3001.538285] ata8.03: ATA-8: WDC WD5000AAKS-00YGA0, 12.01C02, max 
UDMA/133
[ 3001.538288] ata8.03: 976773168 sectors, multi 0: LBA48 NCQ (depth 
31/32)
[ 3001.539229] ata8.03: configured for UDMA/100
[ 3001.539611] ata8: EH complete
[ 3001.539692] scsi 9:0:0:0: Direct-Access     ATA      SAMSUNG HD501LJ 
CR10 PQ: 0 ANSI: 5
[ 3001.540318] sd 9:0:0:0: [sdb] 976773168 512-byte hardware sectors: (500 
GB/465 GiB)
[ 3001.540331] sd 9:0:0:0: [sdb] Write Protect is off
[ 3001.540333] sd 9:0:0:0: [sdb] Mode Sense: 00 3a 00 00
[ 3001.540350] sd 9:0:0:0: [sdb] Write cache: enabled, read cache: 
enabled, doesn't support DPO or FUA
[ 3001.540402] sd 9:0:0:0: [sdb] 976773168 512-byte hardware sectors: (500 
GB/465 GiB)
[ 3001.540413] sd 9:0:0:0: [sdb] Write Protect is off
[ 3001.540415] sd 9:0:0:0: [sdb] Mode Sense: 00 3a 00 00
[ 3001.540432] sd 9:0:0:0: [sdb] Write cache: enabled, read cache: 
enabled, doesn't support DPO or FUA
[ 3001.540436]  sdb: sdb1
[ 3001.546841] sd 9:0:0:0: [sdb] Attached SCSI disk
[ 3001.546896] sd 9:0:0:0: Attached scsi generic sg1 type 0
[ 3001.546980] scsi 9:3:0:0: Direct-Access     ATA      WDC WD5000AAKS-0 
12.0 PQ: 0 ANSI: 5
[ 3001.547054] sd 9:3:0:0: [sdc] 976773168 512-byte hardware sectors: (500 
GB/465 GiB)
[ 3001.547065] sd 9:3:0:0: [sdc] Write Protect is off
[ 3001.547066] sd 9:3:0:0: [sdc] Mode Sense: 00 3a 00 00
[ 3001.547083] sd 9:3:0:0: [sdc] Write cache: enabled, read cache: 
enabled, doesn't support DPO or FUA
[ 3001.547125] sd 9:3:0:0: [sdc] 976773168 512-byte hardware sectors: (500 
GB/465 GiB)
[ 3001.547135] sd 9:3:0:0: [sdc] Write Protect is off
[ 3001.547136] sd 9:3:0:0: [sdc] Mode Sense: 00 3a 00 00
[ 3001.547153] sd 9:3:0:0: [sdc] Write cache: enabled, read cache: 
enabled, doesn't support DPO or FUA
[ 3001.547155]  sdc: sdc1 sdc2 sdc3 sdc4
[ 3001.557923] sd 9:3:0:0: [sdc] Attached SCSI disk
[ 3001.557998] sd 9:3:0:0: Attached scsi generic sg2 type 0

I then unplug port 3:

[ 3042.308009] ata8.03: hard resetting link
[ 3042.628343] ata8.03: SATA link down (SStatus 0 SControl 310)
[ 3042.628378] ata8.03: disabled
[ 3042.628474] ata8: EH complete
[ 3042.628483] ata8.03: detaching (SCSI 9:3:0:0)
[ 3042.628816] sd 9:3:0:0: [sdc] Synchronizing SCSI cache
[ 3042.629167] sd 9:3:0:0: [sdc] Result: hostbyte=DID_BAD_TARGET 
driverbyte=DRIVER_OK,SUGGEST_OK
[ 3042.629170] sd 9:3:0:0: [sdc] Stopping disk
[ 3042.629176] sd 9:3:0:0: [sdc] START_STOP FAILED
[ 3042.629178] sd 9:3:0:0: [sdc] Result: hostbyte=DID_BAD_TARGET 
driverbyte=DRIVER_OK,SUGGEST_OK

and put it back in:

[ 3063.050104] ata8.03: exception Emask 0x10 SAct 0x0 SErr 0x4050000 
action 0xf
[ 3063.050109] ata8.03: SError: { PHYRdyChg CommWake DevExch }
[ 3063.050185] ata8.03: hard resetting link
[ 3063.772345] ata8.03: SATA link up 3.0 Gbps (SStatus 123 SControl 320)
[ 3063.884018] ata8.03: failed to IDENTIFY (I/O error, err_mask=0x11)
[ 3063.884023] ata8.15: hard resetting link
[ 3063.884026] ata8: controller in dubious state, performing PORT_RST
[ 3066.116039] ata8.15: SATA link up 3.0 Gbps (SStatus 123 SControl 0)
[ 3066.116286] ata8.00: hard resetting link
[ 3066.436331] ata8.00: SATA link up 3.0 Gbps (SStatus 123 SControl 320)
[ 3066.436336] ata8.01: hard resetting link
[ 3066.756341] ata8.01: SATA link down (SStatus 0 SControl 320)
[ 3066.756346] ata8.02: hard resetting link
[ 3067.076335] ata8.02: SATA link down (SStatus 0 SControl 320)
[ 3068.772008] ata8.03: hard resetting link
[ 3069.092325] ata8.03: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
[ 3069.092330] ata8.04: hard resetting link
[ 3069.412347] ata8.04: SATA link down (SStatus 0 SControl 320)
[ 3069.412350] ata8.05: hard resetting link
[ 3069.732335] ata8.05: SATA link up 1.5 Gbps (SStatus 113 SControl 320)
[ 3069.754950] ata8.00: configured for UDMA/100
[ 3069.865520] ata8.03: failed to IDENTIFY (I/O error, err_mask=0x11)
[ 3069.865524] ata8.15: hard resetting link
[ 3069.865526] ata8: controller in dubious state, performing PORT_RST
[ 3072.097540] ata8.15: SATA link up 3.0 Gbps (SStatus 123 SControl 0)
[ 3072.097788] ata8.00: hard resetting link
[ 3072.416370] ata8.00: SATA link up 3.0 Gbps (SStatus 123 SControl 320)
[ 3072.416375] ata8.01: hard resetting link
[ 3072.741837] ata8.01: SATA link down (SStatus 0 SControl 320)
[ 3072.741842] ata8.02: hard resetting link
[ 3073.060344] ata8.02: SATA link down (SStatus 0 SControl 320)
[ 3074.093518] ata8.03: hard resetting link
[ 3074.412849] ata8.03: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
[ 3074.732597] ata8.05: hard resetting link
[ 3075.052353] ata8.05: SATA link up 1.5 Gbps (SStatus 113 SControl 320)
[ 3075.074950] ata8.00: configured for UDMA/100
[ 3075.082664] ata8.03: ATA-8: WDC WD5000AAKS-00YGA0, 12.01C02, max 
UDMA/133
[ 3075.082668] ata8.03: 976773168 sectors, multi 0: LBA48 NCQ (depth 
31/32)
[ 3075.083618] ata8.03: configured for UDMA/100
[ 3075.084001] ata8: EH complete
[ 3075.084048] sd 9:0:0:0: [sdb] 976773168 512-byte hardware sectors: (500 
GB/465 GiB)
[ 3075.084070] sd 9:0:0:0: [sdb] Write Protect is off
[ 3075.084076] sd 9:0:0:0: [sdb] Mode Sense: 00 3a 00 00
[ 3075.084105] sd 9:0:0:0: [sdb] Write cache: enabled, read cache: 
enabled, doesn't support DPO or FUA
[ 3075.084140] sd 9:0:0:0: [sdb] 976773168 512-byte hardware sectors: (500 
GB/465 GiB)
[ 3075.084160] sd 9:0:0:0: [sdb] Write Protect is off
[ 3075.084166] sd 9:0:0:0: [sdb] Mode Sense: 00 3a 00 00
[ 3075.084205] sd 9:0:0:0: [sdb] Write cache: enabled, read cache: 
enabled, doesn't support DPO or FUA
[ 3075.084264] scsi 9:3:0:0: Direct-Access     ATA      WDC WD5000AAKS-0 
12.0 PQ: 0 ANSI: 5
[ 3075.084877] sd 9:3:0:0: [sdc] 976773168 512-byte hardware sectors: (500 
GB/465 GiB)
[ 3075.084893] sd 9:3:0:0: [sdc] Write Protect is off
[ 3075.084899] sd 9:3:0:0: [sdc] Mode Sense: 00 3a 00 00
[ 3075.084919] sd 9:3:0:0: [sdc] Write cache: enabled, read cache: 
enabled, doesn't support DPO or FUA
[ 3075.084975] sd 9:3:0:0: [sdc] 976773168 512-byte hardware sectors: (500 
GB/465 GiB)
[ 3075.084990] sd 9:3:0:0: [sdc] Write Protect is off
[ 3075.084995] sd 9:3:0:0: [sdc] Mode Sense: 00 3a 00 00
[ 3075.085015] sd 9:3:0:0: [sdc] Write cache: enabled, read cache: 
enabled, doesn't support DPO or FUA
[ 3075.085024]  sdc: sdc1 sdc2 sdc3 sdc4
[ 3075.094031] sd 9:3:0:0: [sdc] Attached SCSI disk
[ 3075.094083] sd 9:3:0:0: Attached scsi generic sg2 type 0

Unplug port 3:

[ 3096.959797] ata8.03: exception Emask 0x10 SAct 0x0 SErr 0x4010000 
action 0xf
[ 3096.959803] ata8.03: SError: { PHYRdyChg DevExch }
[ 3096.959870] ata8.03: hard resetting link
[ 3097.684321] ata8.03: SATA link down (SStatus 0 SControl 320)
[ 3102.684030] ata8.03: hard resetting link
[ 3103.004350] ata8.03: SATA link down (SStatus 0 SControl 320)
[ 3103.004414] ata8.03: limiting SATA link speed to 1.5 Gbps
[ 3108.004028] ata8.03: hard resetting link
[ 3108.324348] ata8.03: SATA link down (SStatus 0 SControl 310)
[ 3108.324382] ata8.03: disabled
[ 3108.324478] ata8: EH complete
[ 3108.324484] ata8.03: detaching (SCSI 9:3:0:0)
[ 3108.324837] sd 9:3:0:0: [sdc] Synchronizing SCSI cache
[ 3108.325299] sd 9:3:0:0: [sdc] Result: hostbyte=DID_BAD_TARGET 
driverbyte=DRIVER_OK,SUGGEST_OK
[ 3108.325303] sd 9:3:0:0: [sdc] Stopping disk
[ 3108.325309] sd 9:3:0:0: [sdc] START_STOP FAILED
[ 3108.325311] sd 9:3:0:0: [sdc] Result: hostbyte=DID_BAD_TARGET 
driverbyte=DRIVER_OK,SUGGEST_OK

Insert into port 4:

nothing happens.

Remove slot 0:

[ 3154.126800] ata8.00: exception Emask 0x10 SAct 0x0 SErr 0x4010000 
action 0xf
[ 3154.126805] ata8.00: SError: { PHYRdyChg DevExch }
[ 3154.126873] ata8.00: hard resetting link
[ 3154.848327] ata8.00: SATA link down (SStatus 0 SControl 320)
[ 3159.848014] ata8.00: hard resetting link
[ 3160.168331] ata8.00: SATA link down (SStatus 0 SControl 320)
[ 3160.168393] ata8.00: limiting SATA link speed to 1.5 Gbps
[ 3165.168030] ata8.00: hard resetting link
[ 3165.488328] ata8.00: SATA link down (SStatus 0 SControl 310)
[ 3165.488364] ata8.00: disabled
[ 3165.488473] ata8: EH complete
[ 3165.488484] ata8.00: detaching (SCSI 9:0:0:0)
[ 3165.488729] sd 9:0:0:0: [sdb] Synchronizing SCSI cache
[ 3165.488756] sd 9:0:0:0: [sdb] Result: hostbyte=DID_BAD_TARGET 
driverbyte=DRIVER_OK,SUGGEST_OK
[ 3165.488766] sd 9:0:0:0: [sdb] Stopping disk
[ 3165.488777] sd 9:0:0:0: [sdb] START_STOP FAILED
[ 3165.488782] sd 9:0:0:0: [sdb] Result: hostbyte=DID_BAD_TARGET 
driverbyte=DRIVER_OK,SUGGEST_OK

Put slot 0 back in:

[ 3181.810530] ata8.00: exception Emask 0x10 SAct 0x0 SErr 0x4050000 
action 0xf
[ 3181.810536] ata8.00: SError: { PHYRdyChg CommWake DevExch }
[ 3181.810604] ata8.00: hard resetting link
[ 3182.532338] ata8.00: SATA link up 3.0 Gbps (SStatus 123 SControl 320)
[ 3182.644018] ata8.00: failed to IDENTIFY (I/O error, err_mask=0x11)
[ 3182.644022] ata8.15: hard resetting link
[ 3182.644025] ata8: controller in dubious state, performing PORT_RST
[ 3184.876039] ata8.15: SATA link up 3.0 Gbps (SStatus 123 SControl 0)
[ 3187.532016] ata8.00: hard resetting link
[ 3187.852349] ata8.00: SATA link up 3.0 Gbps (SStatus 123 SControl 320)
[ 3187.852355] ata8.01: hard resetting link
[ 3188.172349] ata8.01: SATA link down (SStatus 0 SControl 320)
[ 3188.172353] ata8.02: hard resetting link
[ 3188.492349] ata8.02: SATA link down (SStatus 0 SControl 320)
[ 3188.492353] ata8.03: hard resetting link
[ 3188.812350] ata8.03: SATA link down (SStatus 0 SControl 320)
[ 3188.812355] ata8.04: hard resetting link
[ 3189.132357] ata8.04: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
[ 3189.132360] ata8.05: hard resetting link
[ 3189.452348] ata8.05: SATA link up 1.5 Gbps (SStatus 113 SControl 320)
[ 3189.564018] ata8.00: failed to IDENTIFY (I/O error, err_mask=0x11)
[ 3189.564022] ata8.15: hard resetting link
[ 3189.564025] ata8: controller in dubious state, performing PORT_RST
[ 3191.796038] ata8.15: SATA link up 3.0 Gbps (SStatus 123 SControl 0)
[ 3192.852008] ata8.00: hard resetting link
[ 3193.172334] ata8.00: SATA link up 3.0 Gbps (SStatus 123 SControl 320)
[ 3194.132009] ata8.04: hard resetting link
[ 3194.452350] ata8.04: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
[ 3194.452355] ata8.05: hard resetting link
[ 3194.772342] ata8.05: SATA link up 1.5 Gbps (SStatus 113 SControl 320)
[ 3194.786265] ata8.00: ATA-8: SAMSUNG HD501LJ, CR100-10, max UDMA7
[ 3194.786269] ata8.00: 976773168 sectors, multi 0: LBA48 NCQ (depth 
31/32)
[ 3194.788316] ata8.00: configured for UDMA/100
[ 3194.799671] ata8.04: ATA-8: WDC WD5000AAKS-00YGA0, 12.01C02, max 
UDMA/133
[ 3194.799675] ata8.04: 976773168 sectors, multi 0: LBA48 NCQ (depth 
31/32)
[ 3194.800760] ata8.04: configured for UDMA/100
[ 3194.801146] ata8: EH complete
[ 3194.801228] scsi 9:0:0:0: Direct-Access     ATA      SAMSUNG HD501LJ 
CR10 PQ: 0 ANSI: 5
[ 3194.801318] sd 9:0:0:0: [sdb] 976773168 512-byte hardware sectors: (500 
GB/465 GiB)
[ 3194.801329] sd 9:0:0:0: [sdb] Write Protect is off
[ 3194.801331] sd 9:0:0:0: [sdb] Mode Sense: 00 3a 00 00
[ 3194.801348] sd 9:0:0:0: [sdb] Write cache: enabled, read cache: 
enabled, doesn't support DPO or FUA
[ 3194.801396] sd 9:0:0:0: [sdb] 976773168 512-byte hardware sectors: (500 
GB/465 GiB)
[ 3194.801406] sd 9:0:0:0: [sdb] Write Protect is off
[ 3194.801407] sd 9:0:0:0: [sdb] Mode Sense: 00 3a 00 00
[ 3194.801424] sd 9:0:0:0: [sdb] Write cache: enabled, read cache: 
enabled, doesn't support DPO or FUA
[ 3194.801428]  sdb: sdb1
[ 3194.807183] sd 9:0:0:0: [sdb] Attached SCSI disk
[ 3194.807249] sd 9:0:0:0: Attached scsi generic sg1 type 0
[ 3194.807330] scsi 9:4:0:0: Direct-Access     ATA      WDC WD5000AAKS-0 
12.0 PQ: 0 ANSI: 5
[ 3194.807397] sd 9:4:0:0: [sdc] 976773168 512-byte hardware sectors: (500 
GB/465 GiB)
[ 3194.807408] sd 9:4:0:0: [sdc] Write Protect is off
[ 3194.807410] sd 9:4:0:0: [sdc] Mode Sense: 00 3a 00 00
[ 3194.807427] sd 9:4:0:0: [sdc] Write cache: enabled, read cache: 
enabled, doesn't support DPO or FUA
[ 3194.807467] sd 9:4:0:0: [sdc] 976773168 512-byte hardware sectors: (500 
GB/465 GiB)
[ 3194.807477] sd 9:4:0:0: [sdc] Write Protect is off
[ 3194.807478] sd 9:4:0:0: [sdc] Mode Sense: 00 3a 00 00
[ 3194.807495] sd 9:4:0:0: [sdc] Write cache: enabled, read cache: 
enabled, doesn't support DPO or FUA
[ 3194.807497]  sdc: sdc1 sdc2 sdc3 sdc4
[ 3194.819337] sd 9:4:0:0: [sdc] Attached SCSI disk
[ 3194.819390] sd 9:4:0:0: Attached scsi generic sg2 type 0

Remove slot 4:

[ 3212.728880] ata8.04: exception Emask 0x10 SAct 0x0 SErr 0x4010000 
action 0xf
[ 3212.728886] ata8.04: SError: { PHYRdyChg DevExch }
[ 3212.728953] ata8.04: hard resetting link
[ 3213.452339] ata8.04: SATA link down (SStatus 0 SControl 320)
[ 3218.452009] ata8.04: hard resetting link
[ 3218.772347] ata8.04: SATA link down (SStatus 0 SControl 320)
[ 3218.772412] ata8.04: limiting SATA link speed to 1.5 Gbps
[ 3223.772012] ata8.04: hard resetting link
[ 3224.092346] ata8.04: SATA link down (SStatus 0 SControl 310)
[ 3224.092383] ata8.04: disabled
[ 3224.092480] ata8: EH complete
[ 3224.092489] ata8.04: detaching (SCSI 9:4:0:0)
[ 3224.092837] sd 9:4:0:0: [sdc] Synchronizing SCSI cache
[ 3224.092859] sd 9:4:0:0: [sdc] Result: hostbyte=DID_BAD_TARGET 
driverbyte=DRIVER_OK,SUGGEST_OK
[ 3224.092862] sd 9:4:0:0: [sdc] Stopping disk
[ 3224.092868] sd 9:4:0:0: [sdc] START_STOP FAILED
[ 3224.092869] sd 9:4:0:0: [sdc] Result: hostbyte=DID_BAD_TARGET 
driverbyte=DRIVER_OK,SUGGEST_OK

insert back into slot 4:

[ 3245.277437] ata8.04: exception Emask 0x10 SAct 0x0 SErr 0x4050000 
action 0xf
[ 3245.277443] ata8.04: SError: { PHYRdyChg CommWake DevExch }
[ 3245.277509] ata8.04: hard resetting link
[ 3246.000353] ata8.04: SATA link up 3.0 Gbps (SStatus 123 SControl 320)
[ 3246.112018] ata8.04: failed to IDENTIFY (I/O error, err_mask=0x11)
[ 3246.112022] ata8.15: hard resetting link
[ 3246.112025] ata8: controller in dubious state, performing PORT_RST
[ 3248.344039] ata8.15: SATA link up 3.0 Gbps (SStatus 123 SControl 0)
[ 3248.344293] ata8.00: hard resetting link
[ 3248.664328] ata8.00: SATA link up 3.0 Gbps (SStatus 123 SControl 320)
[ 3248.664333] ata8.01: hard resetting link
[ 3248.984336] ata8.01: SATA link down (SStatus 0 SControl 320)
[ 3248.984341] ata8.02: hard resetting link
[ 3249.304336] ata8.02: SATA link down (SStatus 0 SControl 320)
[ 3249.304340] ata8.03: hard resetting link
[ 3249.624348] ata8.03: SATA link down (SStatus 0 SControl 320)
[ 3251.000014] ata8.04: hard resetting link
[ 3251.320346] ata8.04: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
[ 3251.320350] ata8.05: hard resetting link
[ 3251.640335] ata8.05: SATA link up 1.5 Gbps (SStatus 113 SControl 320)
[ 3251.661160] ata8.00: configured for UDMA/100
[ 3251.772023] ata8.04: failed to IDENTIFY (I/O error, err_mask=0x11)
[ 3251.772027] ata8.15: hard resetting link
[ 3251.772030] ata8: controller in dubious state, performing PORT_RST
[ 3254.004044] ata8.15: SATA link up 3.0 Gbps (SStatus 123 SControl 0)
[ 3254.004302] ata8.00: hard resetting link
[ 3254.324342] ata8.00: SATA link up 3.0 Gbps (SStatus 123 SControl 320)
[ 3254.324346] ata8.01: hard resetting link
[ 3254.644359] ata8.01: SATA link down (SStatus 0 SControl 320)
[ 3254.644363] ata8.02: hard resetting link
[ 3254.964376] ata8.02: SATA link down (SStatus 0 SControl 320)
[ 3254.964380] ata8.03: hard resetting link
[ 3255.285837] ata8.03: SATA link down (SStatus 0 SControl 320)
[ 3256.320819] ata8.04: hard resetting link
[ 3256.640357] ata8.04: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
[ 3256.640362] ata8.05: hard resetting link
[ 3256.960377] ata8.05: SATA link up 1.5 Gbps (SStatus 113 SControl 320)
[ 3256.974186] ata8.00: configured for UDMA/100
[ 3256.984713] ata8.04: ATA-8: WDC WD5000AAKS-00YGA0, 12.01C02, max 
UDMA/133
[ 3256.984716] ata8.04: 976773168 sectors, multi 0: LBA48 NCQ (depth 
31/32)
[ 3256.985670] ata8.04: configured for UDMA/100
[ 3256.986051] ata8: EH complete
[ 3256.986087] sd 9:0:0:0: [sdb] 976773168 512-byte hardware sectors: (500 
GB/465 GiB)
[ 3256.986104] sd 9:0:0:0: [sdb] Write Protect is off
[ 3256.986107] sd 9:0:0:0: [sdb] Mode Sense: 00 3a 00 00
[ 3256.986132] sd 9:0:0:0: [sdb] Write cache: enabled, read cache: 
enabled, doesn't support DPO or FUA
[ 3256.986161] sd 9:0:0:0: [sdb] 976773168 512-byte hardware sectors: (500 
GB/465 GiB)
[ 3256.986176] sd 9:0:0:0: [sdb] Write Protect is off
[ 3256.986178] sd 9:0:0:0: [sdb] Mode Sense: 00 3a 00 00
[ 3256.986203] sd 9:0:0:0: [sdb] Write cache: enabled, read cache: 
enabled, doesn't support DPO or FUA
[ 3256.986278] scsi 9:4:0:0: Direct-Access     ATA      WDC WD5000AAKS-0 
12.0 PQ: 0 ANSI: 5
[ 3256.986363] sd 9:4:0:0: [sdc] 976773168 512-byte hardware sectors: (500 
GB/465 GiB)
[ 3256.986373] sd 9:4:0:0: [sdc] Write Protect is off
[ 3256.986375] sd 9:4:0:0: [sdc] Mode Sense: 00 3a 00 00
[ 3256.986392] sd 9:4:0:0: [sdc] Write cache: enabled, read cache: 
enabled, doesn't support DPO or FUA
[ 3256.986438] sd 9:4:0:0: [sdc] 976773168 512-byte hardware sectors: (500 
GB/465 GiB)
[ 3256.986448] sd 9:4:0:0: [sdc] Write Protect is off
[ 3256.986449] sd 9:4:0:0: [sdc] Mode Sense: 00 3a 00 00
[ 3256.986466] sd 9:4:0:0: [sdc] Write cache: enabled, read cache: 
enabled, doesn't support DPO or FUA
[ 3256.986469]  sdc: sdc1 sdc2 sdc3 sdc4
[ 3256.996065] sd 9:4:0:0: [sdc] Attached SCSI disk
[ 3256.996119] sd 9:4:0:0: Attached scsi generic sg2 type 0

remove it from slot 4:

[ 3279.547817] ata8.04: exception Emask 0x10 SAct 0x0 SErr 0x4010000 
action 0xf
[ 3279.547822] ata8.04: SError: { PHYRdyChg DevExch }
[ 3279.547889] ata8.04: hard resetting link
[ 3280.272329] ata8.04: SATA link down (SStatus 0 SControl 320)
[ 3285.272011] ata8.04: hard resetting link
[ 3285.592343] ata8.04: SATA link down (SStatus 0 SControl 320)
[ 3285.592407] ata8.04: limiting SATA link speed to 1.5 Gbps
[ 3290.592014] ata8.04: hard resetting link
[ 3290.912353] ata8.04: SATA link down (SStatus 0 SControl 310)
[ 3290.912388] ata8.04: disabled
[ 3290.912486] ata8: EH complete
[ 3290.912493] ata8.04: detaching (SCSI 9:4:0:0)
[ 3290.912842] sd 9:4:0:0: [sdc] Synchronizing SCSI cache
[ 3290.913199] sd 9:4:0:0: [sdc] Result: hostbyte=DID_BAD_TARGET 
driverbyte=DRIVER_OK,SUGGEST_OK
[ 3290.913204] sd 9:4:0:0: [sdc] Stopping disk
[ 3290.913211] sd 9:4:0:0: [sdc] START_STOP FAILED
[ 3290.913212] sd 9:4:0:0: [sdc] Result: hostbyte=DID_BAD_TARGET 
driverbyte=DRIVER_OK,SUGGEST_OK

insert it into slot 1:

[ 3303.617230] ata8.01: exception Emask 0x10 SAct 0x0 SErr 0x4000000 
action 0xf
[ 3303.617235] ata8.01: SError: { DevExch }
[ 3303.617307] ata8.01: hard resetting link
[ 3304.340351] ata8.01: SATA link up 3.0 Gbps (SStatus 123 SControl 320)
[ 3304.452018] ata8.01: failed to IDENTIFY (I/O error, err_mask=0x11)
[ 3304.452023] ata8.15: hard resetting link
[ 3304.452025] ata8: controller in dubious state, performing PORT_RST
[ 3306.684039] ata8.15: SATA link up 3.0 Gbps (SStatus 123 SControl 0)
[ 3306.684292] ata8.00: hard resetting link
[ 3307.005330] ata8.00: SATA link up 3.0 Gbps (SStatus 123 SControl 320)
[ 3309.340020] ata8.01: hard resetting link
[ 3309.660352] ata8.01: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
[ 3309.660356] ata8.02: hard resetting link
[ 3309.981335] ata8.02: SATA link down (SStatus 0 SControl 320)
[ 3309.981339] ata8.03: hard resetting link
[ 3310.300350] ata8.03: SATA link down (SStatus 0 SControl 320)
[ 3310.300354] ata8.04: hard resetting link
[ 3310.620341] ata8.04: SATA link down (SStatus 0 SControl 320)
[ 3310.620346] ata8.05: hard resetting link
[ 3310.940335] ata8.05: SATA link up 1.5 Gbps (SStatus 113 SControl 320)
[ 3310.962930] ata8.00: configured for UDMA/100
[ 3311.073023] ata8.01: failed to IDENTIFY (I/O error, err_mask=0x11)
[ 3311.073027] ata8.15: hard resetting link
[ 3311.073030] ata8: controller in dubious state, performing PORT_RST
[ 3313.305043] ata8.15: SATA link up 3.0 Gbps (SStatus 123 SControl 0)
[ 3313.305280] ata8.00: hard resetting link
[ 3313.624358] ata8.00: SATA link up 3.0 Gbps (SStatus 123 SControl 320)
[ 3314.661021] ata8.01: hard resetting link
[ 3314.984857] ata8.01: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
[ 3315.941095] ata8.05: hard resetting link
[ 3316.261331] ata8.05: SATA link up 1.5 Gbps (SStatus 113 SControl 320)
[ 3316.265343] ata8.00: configured for UDMA/100
[ 3316.272185] ata8.01: ATA-8: WDC WD5000AAKS-00YGA0, 12.01C02, max 
UDMA/133
[ 3316.272189] ata8.01: 976773168 sectors, multi 0: LBA48 NCQ (depth 
31/32)
[ 3316.273118] ata8.01: configured for UDMA/100
[ 3316.273496] ata8: EH complete
[ 3316.273533] sd 9:0:0:0: [sdb] 976773168 512-byte hardware sectors: (500 
GB/465 GiB)
[ 3316.273550] sd 9:0:0:0: [sdb] Write Protect is off
[ 3316.273553] sd 9:0:0:0: [sdb] Mode Sense: 00 3a 00 00
[ 3316.273578] sd 9:0:0:0: [sdb] Write cache: enabled, read cache: 
enabled, doesn't support DPO or FUA
[ 3316.273607] sd 9:0:0:0: [sdb] 976773168 512-byte hardware sectors: (500 
GB/465 GiB)
[ 3316.273622] sd 9:0:0:0: [sdb] Write Protect is off
[ 3316.273625] sd 9:0:0:0: [sdb] Mode Sense: 00 3a 00 00
[ 3316.273649] sd 9:0:0:0: [sdb] Write cache: enabled, read cache: 
enabled, doesn't support DPO or FUA
[ 3316.273723] scsi 9:1:0:0: Direct-Access     ATA      WDC WD5000AAKS-0 
12.0 PQ: 0 ANSI: 5
[ 3316.273823] sd 9:1:0:0: [sdc] 976773168 512-byte hardware sectors: (500 
GB/465 GiB)
[ 3316.273833] sd 9:1:0:0: [sdc] Write Protect is off
[ 3316.273835] sd 9:1:0:0: [sdc] Mode Sense: 00 3a 00 00
[ 3316.273852] sd 9:1:0:0: [sdc] Write cache: enabled, read cache: 
enabled, doesn't support DPO or FUA
[ 3316.273901] sd 9:1:0:0: [sdc] 976773168 512-byte hardware sectors: (500 
GB/465 GiB)
[ 3316.273910] sd 9:1:0:0: [sdc] Write Protect is off
[ 3316.273912] sd 9:1:0:0: [sdc] Mode Sense: 00 3a 00 00
[ 3316.273929] sd 9:1:0:0: [sdc] Write cache: enabled, read cache: 
enabled, doesn't support DPO or FUA
[ 3316.273932]  sdc: sdc1 sdc2 sdc3 sdc4
[ 3316.283551] sd 9:1:0:0: [sdc] Attached SCSI disk
[ 3316.283601] sd 9:1:0:0: Attached scsi generic sg2 type 0


-- 
Mikael Abrahamsson    email: swmike@swm.pp.se

Re: PMPs

[Tejun Heo]

Hello,

Mikael Abrahamsson wrote:
> I have posted a boot time dmesg at <http://swm.pp.se/dmesg090416.txt>
> 
> Executive summary of everything that follows below (my opinion of what
> is happening):
> 
> If a drive isn't present at boot time in a slot, it's somehow
> "uninitialised". Inserting a drive into a slot not populated before,
> doesn't get detected. If I leave the "undetected" drive, and unplug slot
> 0 drive and insert it again, it's now detected and hotplugging of that
> drive works again. I verified this behaviour with slot 2, 3 and 4 below:
> 
> So, summary of events (first references the above dmesg file):
> 
> At 54s I unplug port1, at 65s I unplug port0, at ~90s I insert same disk
> in port0, at around 120s I insert port1, nothing happens, I then remove
> port0 again, and re-insert it at ~150 or so.
> 
> Since I am a bit uncertain about the times above, I'll do it one more
> time and mark each event. State when beginning, both drives are seen.

You need to keep port0 occupied all the time and even then hotplug
sometimes doesn't work.  The firmware on those PMPs are quite flaky.
If cold plug works, it would probably be best to just leave it at
that.

Thanks.

-- 
tejun