topic Re: suspect disk in Operating System - HP-UX

suspect disk

TMcB — Tue, 12 Feb 2002 14:30:26 GMT

Hi folks

Does anyone know of a way I can check to see f one of my disks is faulty
eg by scanning it, etc.

It is mounted OK, but funny things have been hapenning to some files, and I would like to rule out a disk fault.

Thanks

Re: suspect disk

Patrick Wallek — Tue, 12 Feb 2002 14:34:26 GMT

A couple of things you can do:

1) Use STM (cstm,xstm) to look at the disk and look at its logs.

2) You can do a dd of the disk, and if the dd doesn't complete successfully then you probably have a problem.

# dd if=/dev/dsk/c?t?d0 of=/dev/null bs=512k

Re: suspect disk

Sanjay_6 — Tue, 12 Feb 2002 14:34:28 GMT

Hi Terry,

you can do a dd on the disk and check if the disk is having any problem,

dd if=/dev/rdsk/cxtydz of=/dev/null bs=1024k

If this completes with the message so many records in and so many record out, it should be okay. Else you should see some errors.

Hope this helps.

Regds

Re: suspect disk

Helen French — Tue, 12 Feb 2002 14:38:07 GMT

Hi,

Several things to try:

1) Run STM and check the disk utilities. Check out the log files.

2) Run dd command:

# dd if=/dev/dsk/cxtxdx of=/dev/null

3) Run fsck - for file system checks, if LVM. Check it for all file systems with full option ( fsck -o full)

4) Check the output of 'diskinfo', 'pvdisplay' and 'ioscan -fnC disk'

5) Check disk through offline diag.

HTH,
Shiju

Re: suspect disk

TMcB — Tue, 12 Feb 2002 14:50:18 GMT

Hi

What does dd do?

Re: suspect disk

Patrick Wallek — Tue, 12 Feb 2002 14:52:30 GMT

dd will go through the entire disk and read each block, and then discard into /dev/null (ie. bit bucket). If dd runs into a problem reading one of the blocks on the disk, then it will immediately error out.

Re: suspect disk

Helen French — Tue, 12 Feb 2002 15:01:08 GMT

Hi,

This is a guide for dd:

http://www.docs.hp.com/cgi-bin/fsearch/framedisplay?top=/hpux/onlinedocs/B2355-90680/B2355-90680_top.html&con=/hpux/onlinedocs/B2355-90680/00/00/67-con.html&toc=/hpux/onlinedocs/B2355-90680/00/00/67-toc.html&searchterms=dd&queryid=20020212-070303

HTH,
Shiju

Re: suspect disk

TMcB — Tue, 12 Feb 2002 15:02:44 GMT

Thanks everyone
It came back with no errors