Atif,
Do you have the Cleaning Tapesproperly configured? Are the Cleaning tapes part on the NONE Volume pool.
Dmesg is a command for ------------>
dmesg(1M) dmesg(1M)
NAME
dmesg - collect system diagnostic messages to form error log
Most likley its a coincidence that you see an error 5, you may want to copy and paste that error into the servers manufacturer's web site.
HP's would be
http://www1.itrc.hp.com
JD