Re: PMPs

[Tejun Heo <tj@kernel.org>]

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