hi there,

we find ourself in the same situation as posted on this list before [1]

first of all, the hardware details:

System:
 > Tyan Transport GT24-B3992
 > Motherboard: Tyan B3992
 > Dual Opteron 2218 (Dual-Core)
 > 8GB RAM

SAS Controller:
 > product: AIC-9410W SAS (Razor ASIC RAID)=20
 > vendor: Adaptec

 > controler-bios: BIOS present (1,1), 1820
 > controler-sequencer: Firmware version 1.1 (V30)

Harddisks:
 > 4x Seagate Cheetah 15K.5 ST373455SS

There is a Software Raid10 on top of those 4 disks.
 > vanilla kernel 2.6.25-rc5
 > Debian GNU/Linux 4.0, AMD64


coming to the problem description itself:

the server is booted, the raid is working as intended
 > md4 : active raid10 sdb9[1] sda9[0] sdd9[3] sdc9[2]
 >       100181120 blocks 64K chunks 2 near-copies [4/4] [UUUU]

now we mount /dev/md4 to /home, cd there and run an io intensive task
such as stress, tiobench (or even raid-reinit is enough)
 > stress --hdd 20 --hdd-bytes 2gb --hdd-noclean

soon we see:
 > aic94xx: escb_tasklet_complete: REQ_TASK_ABORT, reason=0x6
 > sas: command 0xffff81023fb2ca80, task 0xffff81023ea7ab40, timed out: 
EH_NOT_HANDLED
 > ...
 > sas: Enter sas_scsi_recover_host
 > sas: trying to find task 0xffff81023ea7ab40
 > sas: sas_scsi_find_task: aborting task 0xffff81023ea7ab40
 > ...
 > sas: --- Exit sas_scsi_recover_host

please se the attached logfile.

sometimes even a disk is kicked out of the raid configuration.

any idea what is causing this? maybe some of the folks who provide code
for the aic94xx module can help us out.

i am available for provoding more data, enabling debug code, giving
access to a test-server with this hardware, etc.

cheers,
raoul

[1] http://www.mail-archive.com/linux-scsi@vger.kernel.org/msg06332.html
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