topic Re: Checking tape drive in Operating System - HP-UX

Checking tape drive

csreenivas — Fri, 18 May 2007 15:09:13 GMT

Bad tape drive has been replaced by vendor on server.How to check whether he replaced correct one or not from remote?

Re: Checking tape drive

A. Clay Stephenson — Fri, 18 May 2007 15:15:06 GMT

State with an ioscan -C tape -fn. Does the drive appear? The model should be listed.

Next issue an "mt -f /dev/rmt/Xm stat" preferably with a tape loaded.

Re: Checking tape drive

mavrick — Fri, 18 May 2007 16:22:38 GMT

Hi,
Check the H/W path of the drive is matching with your old configuration.
then try by
ioscan -fnH
this will give you the full path and device

pl keep post ur reply

Re: Checking tape drive

csreenivas — Mon, 21 May 2007 12:36:44 GMT

My ioscan output is showing like this...I am not sure that vendor replaced the tape drive correctly.(tape1 or tape2)

------------
Class I H/W Path Driver S/W State H/W Type Description
=====================================================================
tape 1 0/4/0/0.2.0 stape NO_HW DEVICE QUANTUM DLT8000
/dev/rmt/1m /dev/rmt/c4t2d0BEST
/dev/rmt/1mb /dev/rmt/c4t2d0BESTb
/dev/rmt/1mn /dev/rmt/c4t2d0BESTn
/dev/rmt/1mnb /dev/rmt/c4t2d0BESTnb
tape 2 0/4/0/0.4.0 stape CLAIMED DEVICE QUANTUM DLT8000
------------------------------------

Re: Checking tape drive

A. Clay Stephenson — Mon, 21 May 2007 12:41:19 GMT

My best guess is that he changed the SCSI ID from 2 to 4 so either change the SCSI ID or do a rmsf to remove the original tape drive device nodes or run insf to install new tape device nodes but if you do that without doing an rmsf, what was /dev/rmt/1mn, for example, will now be /dev/rmt/2mn or some other value).

Re: Checking tape drive

csreenivas — Tue, 22 May 2007 12:46:16 GMT

Thank You.
Can you please send me the commands with options how to use rmsf and insf to remove and create device files.
#insf -e -H 0/4/0/0.4.0 Is it correct?

Re: Checking tape drive

A. Clay Stephenson — Tue, 22 May 2007 13:59:23 GMT

tape 1 0/4/0/0.2.0 stape NO_HW DEVICE QUANTUM DLT8000
/dev/rmt/1m /dev/rmt/c4t2d0BEST
/dev/rmt/1mb /dev/rmt/c4t2d0BESTb
/dev/rmt/1mn /dev/rmt/c4t2d0BESTn
/dev/rmt/1mnb /dev/rmt/c4t2d0BESTnb
tape 2 0/4/0/0.4.0 stape CLAIMED DEVICE QUANTUM DLT8000

If this were me, I would have Mr. Goodwrench come back and change the SCSI ID from 4 back to the original 2. Of course, YOU should have checked this before he left. I never assume that my Mr. Goodwrenches can do anything although, generally, most of them know something. Then all you would need to do is:

rmsf -H 0/4/0/0.4.0 -v

However, you can:

rmsf -H 0/4/0/0.2.0 -v
insf -d stape -I 1 -H 0/4/0/0.4.0

Re: Checking tape drive

csreenivas — Wed, 23 May 2007 14:27:44 GMT

Thank You.
Is it compulsory to use the insf command in single user mode?

Re: Checking tape drive

A. Clay Stephenson — Wed, 23 May 2007 14:35:33 GMT

No. It is more risky for disk drives but as long as your are careful about the hardware paths, you should be fine. Again, if this were me, I would yank the tape drive out (if it is internal) and change the SCSI ID or if it's external then it's typically just changing a thumbwheel switch setting so that your old device nodes continue to work.

Re: Checking tape drive

csreenivas — Wed, 30 May 2007 12:33:45 GMT

Thank You solved the issue.
by creating the device files on scscid 4 and removed the devicefiles on scscid 2.
now backup is running successfully.