the disk will displayed as /dev/dsk/c#t#d#
identify the disk which you need to check
use dd command to identify the disk as well as check for bad blocks
#dd if=/dev/dsk/c#t#d# of=/dev/null bs=512 (The disk will start blinking once i/o operations will start)
I would rather dd from the raw device and read bigger chunks
dd if=/dev/rdsk/c?t?d? of=/dev/null bs=1024k
If your disk is defunct then the command would probably hang and could not be killed.
Therefore better start it as a batch job,
or if run from the console run tsm before
to have another virtual terminal to leave you a prompt.
You could also let the device try to identify
diskinfo -v /dev/rdsk/c?t?d?
If not all fields are populated there might be a problem with the disk.
Also see if ioscan reports loss of hardware
/usr/sbin/ioscan -fCdisk|grep NO_HW
If you have OnlineDiag installed (swlist OnlineDiag)
you could run stm and read info logs of disk.
If you have EMS running you should check its log for any
But if you had it should have warned you by some notification email.
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