aacraid: Host adapter reset request. SCSI hang ? Adaptec 2820SA

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I am seeing the above message in logs.

Some times the system locks up, some times it continues. The OS
resides on the RAID array, so if the controller goes offline, the
system cannot continue running.

Any ideas what might be causing this?

I am running a RedHat AMD64 system, with kernel: 2.6.9-34.EL and
aacraid module version 1.1-5[2425].

More info:
#   grep aac /var/log/dmesg
Adaptec aacraid driver (1.1-5[2425])
aacraid0: kernel 5.1-0[9117]
aacraid0: monitor 5.1-0[9117]
aacraid0: bios 5.1-0[9117]
aacraid0: serial 504e8b
scsi0 : aacraid

Does anyone have any suggestions? The system has hung twice within the
space of 2 hours, so this is not good!

Regards,
Simon
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