[Bug 14534] New: mvsas : repeatably disconnects all disks during RAID6 resync

[Bug 14534] New: mvsas : repeatably disconnects all disks during RAID6 resync

[bugzilla-daemon]

http://bugzilla.kernel.org/show_bug.cgi?id=14534

           Summary: mvsas : repeatably disconnects all disks during RAID6
                    resync
           Product: IO/Storage
           Version: 2.5
    Kernel Version: 2.6.31.5
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: SCSI
        AssignedTo: linux-scsi@vger.kernel.org
        ReportedBy: wagner@tik.ee.ethz.ch
        Regression: No


Created an attachment (id=23624)
 --> (http://bugzilla.kernel.org/attachment.cgi?id=23624)
Error log from /var/log/kern.log

I am in the process of evaluating 8 port SATA/SAS PCI-E controllers for 
a storage server. I started with a Supermicro AOC-SASLP-MV8 which runs 
on a Marvell 6480 host controller. 
- Direct storage access was fine.
- RAID1 with 2 disks was fine. 
- A RAID6 with 4 disks disconnected all drives within a very 
  short time directly after creation, error log attached. The 
  disks only become accessible again after cold reboot and I 
  had to manually disconnect 2 of them in order to be able to 
  access them at all, since  the disks were immediately 
  disconnected again by the resync process.

The disks had no errors in their logs. 3 have seen extended use without 
problems and one is new, but also has a long SMART selftest and some 
hours of use without problems. They are all different, which should 
rule out a controller/disk interaction issue, unless such a problem 
on one port can kill all four ports.

Disk list:
=========
sda: 160GB Samsung SP1614C
sdb: 500GB Seagate Barracuda 7200.12  (new)
sdc: 80 GB Seagate ST380021A, attached via RockerHead 100 SATA->IDE converter
sdd: 40 GB Hitachi Travelstar 5K100 HTS541040G9SA00
sde (system drive, not in RAID): Same as sdc

Output from lspci:
=================
exp:root ~>lspci
00:00.0 Host bridge: Advanced Micro Devices [AMD] RS780 Host Bridge
00:01.0 PCI bridge: Advanced Micro Devices [AMD] RS780 PCI to PCI bridge (int
gfx)
00:03.0 PCI bridge: Advanced Micro Devices [AMD] RS780 PCI to PCI bridge (ext
gfx port 1)
00:06.0 PCI bridge: Advanced Micro Devices [AMD] RS780 PCI to PCI bridge (PCIE
port 2)
00:11.0 SATA controller: ATI Technologies Inc SB700/SB800 SATA Controller [IDE
mode]
00:12.0 USB Controller: ATI Technologies Inc SB700/SB800 USB OHCI0 Controller
00:12.1 USB Controller: ATI Technologies Inc SB700 USB OHCI1 Controller
00:12.2 USB Controller: ATI Technologies Inc SB700/SB800 USB EHCI Controller
00:13.0 USB Controller: ATI Technologies Inc SB700/SB800 USB OHCI0 Controller
00:13.1 USB Controller: ATI Technologies Inc SB700 USB OHCI1 Controller
00:13.2 USB Controller: ATI Technologies Inc SB700/SB800 USB EHCI Controller
00:14.0 SMBus: ATI Technologies Inc SBx00 SMBus Controller (rev 3a)
00:14.1 IDE interface: ATI Technologies Inc SB700/SB800 IDE Controller
00:14.2 Audio device: ATI Technologies Inc SBx00 Azalia (Intel HDA)
00:14.3 ISA bridge: ATI Technologies Inc SB700/SB800 LPC host controller
00:14.4 PCI bridge: ATI Technologies Inc SBx00 PCI to PCI Bridge
00:14.5 USB Controller: ATI Technologies Inc SB700/SB800 USB OHCI2 Controller
00:18.0 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron]
HyperTransport Technology Configuration
00:18.1 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] Address
Map
00:18.2 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] DRAM
Controller
00:18.3 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron]
Miscellaneous Control
01:05.0 VGA compatible controller: ATI Technologies Inc Radeon HD 3300 Graphics
01:05.1 Audio device: ATI Technologies Inc RS780 Azalia controller
02:00.0 SCSI storage controller: Marvell Technology Group Ltd.
MV64460/64461/64462 System Controller, Revision B (rev 01)
03:00.0 Ethernet controller: Attansic Technology Corp. L1 Gigabit Ethernet
Adapter (rev b0)
exp:root ~>

Attached files:

relevant part of /var/log/kern.log
.config in followup

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[Bug 14534] mvsas : repeatably disconnects all disks during RAID6 resync

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http://bugzilla.kernel.org/show_bug.cgi?id=14534





--- Comment #1 from Arno Wagner <wagner@tik.ee.ethz.ch>  2009-11-03 02:10:23 ---
Created an attachment (id=23625)
 --> (http://bugzilla.kernel.org/attachment.cgi?id=23625)
kernel .config

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[Bug 14534] mvsas : repeatably disconnects all disks during RAID6 resync

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quig48pak6ui <arno@wagner.name> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |arno@wagner.name




--- Comment #2 from quig48pak6ui <arno@wagner.name>  2009-11-03 02:22:02 ---
Please send email to arno@wagner.name. I accidentially posted from the wrong
account and the forwarding for my old email seems not to work anymore.

Arno

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[Bug 14534] mvsas : repeatably disconnects all disks during RAID6 resync

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http://bugzilla.kernel.org/show_bug.cgi?id=14534


andy yan <ayan@marvell.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |ayan@marvell.com




--- Comment #3 from andy yan <ayan@marvell.com>  2009-11-03 09:41:02 ---
I will commit a patch to update the mvsas code to latest version, this version
fixed some issue with disk IO.

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[Bug 14534] mvsas : repeatably disconnects all disks during RAID6 resync

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--- Comment #4 from quig48pak6ui <arno@wagner.name>  2009-11-03 12:45:56 ---
I will give it a try when I have it.

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[Bug 14534] mvsas : repeatably disconnects all disks during RAID6 resync

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--- Comment #5 from andy yan <ayan@marvell.com>  2009-11-10 01:29:32 ---
I committed patch, please check it.

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[Bug 14534] mvsas : repeatably disconnects all disks during RAID6 resync

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--- Comment #6 from quig48pak6ui <arno@wagner.name>  2009-11-10 15:23:05 ---
Seems not to be in git yet, at least I cannot find it anywhere. Can you mail me
the patch directly and tell me what to apply it to?

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[Bug 14534] mvsas : repeatably disconnects all disks during RAID6 resync

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http://bugzilla.kernel.org/show_bug.cgi?id=14534





--- Comment #7 from andy yan <ayan@marvell.com>  2009-11-11 01:14:53 ---
Are you in the SCSI mail list, if yes, you should have received it. OK, I will
forward it to you.

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[Bug 14534] mvsas : repeatably disconnects all disks during RAID6 resync

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http://bugzilla.kernel.org/show_bug.cgi?id=14534


Christian Vilhelm <christian.vilhelm@univ-lille2.fr> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |christian.vilhelm@univ-lill
                   |                            |e2.fr




--- Comment #8 from Christian Vilhelm <christian.vilhelm@univ-lille2.fr>  2009-11-11 20:50:40 ---
I just tried the patches on 2.6.32-rc6, I did not apply the 7th patch as the
new libsas version is not in -rc6.
I could create a raid 5 array just fine on 6 SATA disks, using a 64xx based
card (Areca 1300). The raid-5 build was not possible without the patches (tried
many times with different configurations).
I will do some more tests in the coming days to confirm this.
Many thanks Andy for fixing this.

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[Bug 14534] mvsas : repeatably disconnects all disks during RAID6 resync

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--- Comment #9 from quig48pak6ui <arno@wagner.name>  2009-11-14 05:01:40 ---
Just found the patches in the SCSI mailing list archives at 
http://marc.info. I am in the process of trying them out 
on a 4 disk RAID6 setup.

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[Bug 14534] mvsas : repeatably disconnects all disks during RAID6 resync

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--- Comment #10 from Arno Wagner <arno@wagner.name>  2009-11-14 11:03:55 ---
I did apply patches 1...6 to 2.6.32-rc7 successfully. Patch 7 applies but then
causes a compile error (looks like the same thing Christian found).

Function looks good. No issues on building the RAID6. No issues during fast
sequential reading or writing. No issues when compiling kernels in a loop. Hot
plugging works. Performance looks about right and is at roughly 1.5 times the
throughput of the slowest disk for sequential reading and writing.

I will do some more tests and if anything shows up, I will post it here.

Thanks for the quick fix, Andy!

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