kernel: aacraid: Host adapter abort request (0,0,0,0)

ervers are running Adaptec 5405 RAID cards with 2×300 GB SAS disks.

Everytime in /var/log/messages I get information about SCSI hang:

kernel: aacraid: Host adapter abort request (0,0,0,0)
kernel: aacraid: Host adapter reset request. SCSI hang ?
kernel: aacraid: SCSI bus appears hung

I reviewed controller logs, and I saw that each time the controller tried to resolve this several times without success. Then I saw a controller reboot, which finally sorted the problem. This all happend on working server, without server panic, there were only very high load when server was unable to write information to HDDs and it then it started to use SWAP.

The last thing I’ve observed after such controller reset is that [aacraid] server process changed into [AAC] process – I have not installed any additional drivers for Adaptec cards on my server! And process name changes!

I don’t know if anyone has simmilar problems with Adaptec RAID cards?

echo 1 > /sys/module/processor/parameters/max_cstate