CPQCISSM1 error

[rich craxton]

Can anyone tell me the best way to hunt this problem down - The device \Device\scsi\cpqcissm1, did not respond within the time out period. Keep in mind, equipment has been setup this way and working for about 1 year now. Have HP storageworks aio400 running windows storage server 2003 sp2. 1 scsi external card with 2 ports, 1 going to a hp storageworks MSA20 and the other to an exabyte 1x7 tape drive. These errors seem to pop up randomly. Read articles of the similiar saying it could be cables, machines, drives, firmware etc... where do you start?

Thanks for any help
rich