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

disk problem

Kranti Mahmud — Tue, 21 Sep 2010 05:21:01 GMT

Hi there,

In one of our production server, the LV status of few LV become stale instead of syncd automatically. Output is attached here. Any suggestion???

Rgds-Kranti

Re: disk problem

Kranti Mahmud — Tue, 21 Sep 2010 05:22:39 GMT

Hi,

Server model: rp4440
OS: HPUX 11.1

Rgds-Kranti

Re: disk problem

Bijeesh — Tue, 21 Sep 2010 06:01:00 GMT

Hi,
From your vgdisplay o/p, one of your root disk is 'unavailable'
PV Name /dev/dsk/c3t6d0
PV Status unavailable

May be the disk is going bad.Check the status of the disk using dikinfo.

Re: disk problem

Horia Chirculescu — Tue, 21 Sep 2010 06:49:58 GMT

You can test the disk's accessibility like this:

dd if=/dev/rdsk/c3t6d0 of=/dev/null bs=64k count=100

If you get some error, you should check connectivity cables (maybe pull out the disk from the encloser then put it back). If all looks ok, replace the disk.

Best regards
Horia.

Re: disk problem

Bhadresh — Tue, 21 Sep 2010 06:59:18 GMT

Hi Kranti,

Looks like disk is faulty one from the following o/p.
PV Name /dev/dsk/c3t6d0
PV Status unavailable

Have a look at following document:

http://docs.hp.com/en/5991-1236/When_Good_Disks_Go_Bad_WP.pdf

Regards,
Bhadresh

Re: disk problem

Hakki Aydin Ucar — Tue, 21 Sep 2010 07:24:39 GMT

Hi,
/dev/dsk/c3t6d0 seems problematic as already stated others;

You can also check this way;
echo 2400?20X | adb /dev/dsk/c3t6d0

Command output should be as follows (if there are no disk errors).

2400: 44454645 43543031 0 0
0 0 0 0
0 0 0 0
0 0 0 0
0 0 0 0

Those counters indicate of BBDIR that BadBlockDirectory any Bad Sector occurs in any disk , these numbers will be registered into these counters;
So, any non zero numbers indicate bad blocks and that disk should be changed on the spot !

Re: disk problem

Viktor Balogh — Wed, 22 Sep 2010 10:27:32 GMT

Hi Hakki,

On my system it doesn't work:

# echo 2400?20x | adb /dev/dsk/c0t0d0
cannot open `/dev/dsk/c0t0d0'
2400:
text address not found
#

What could be wrong?

Re: disk problem

Chandrahasa s — Wed, 22 Sep 2010 15:33:01 GMT

Hi,

PV Name /dev/dsk/c3t6d0
PV Status unavailable

Pvstatus show one of vg00 is unavailable.
do ioscan -fnC disk

verify vgdisplay -v vg00
if still problem persists

so verify disk using dd if=/dev/dsk/c3t6d0 of=/dev/null bs=1024

diskinfo /dev/rdsk/c3t6d0

verify syslog for any io error.

if disk fail confirmed proceed with replacement.

Re: disk problem

Hakki Aydin Ucar — Mon, 27 Sep 2010 11:12:55 GMT

>Victor:
On my system it doesn't work:

It is probably you put wrong device name as if CD ROM or DVD ROM.
Command syntax is right, try to find correct device name with ;
# ioscan -fnCdisk

then try again