topic Re: vgscan doesn't update lvmtab correctly in Operating System - HP-UX

vgscan doesn't update lvmtab correctly

Tim Leong_1 — Tue, 13 Apr 2004 13:45:35 GMT

When I remove the current lvmtab and run vgscan -av, the new lvmtab doesn't show any information about vg00, which contains my root filesystem.

Is there anyway that I can update the lvmtab file to contain data about vg00?

Re: vgscan doesn't update lvmtab correctly

Sanjay_6 — Tue, 13 Apr 2004 13:48:16 GMT

Hi Tim,

Do you have Service Guard on the system ?

Regds

Re: vgscan doesn't update lvmtab correctly

Tim Leong_1 — Tue, 13 Apr 2004 13:50:04 GMT

No, I don't.

Re: vgscan doesn't update lvmtab correctly

Jeff Schussele — Tue, 13 Apr 2004 13:51:21 GMT

Hi Tim,

Could it be possible that the system was brought up in LVM maintenance mode & then not rebooted but instead init 3 was run?
If that's the case /dev/vg00 could be designated as /dev/root instead.
Is /dev/root listed in lvmtab now?

Rgds,
Jeff

Re: vgscan doesn't update lvmtab correctly

Sanjay_6 — Tue, 13 Apr 2004 13:52:20 GMT

Do a ll in /dev and see if there is a device file with the same minor no as /dev/vg00/group. Also do a ll /dev/*/group to see that there are no duplicate groups with the same minor number,

ll /dev |grep "0x000000"
ll /dev/*/group

Hope this helps.

Regds

Re: vgscan doesn't update lvmtab correctly

Tim Leong_1 — Tue, 13 Apr 2004 13:59:30 GMT

Jeff,
There is no /dev/root entry in lvmtab. But root is mounted from /dev/root.

Sanjay,
Lots of the same minor numbers in /dev, no same major numbers though. All of the group files have different minor numbers.

Re: vgscan doesn't update lvmtab correctly

Sanjay_6 — Tue, 13 Apr 2004 14:02:55 GMT

Hi Tim,

Try this,

cd /dev
ll |grep "0x000000" |grep "64"

Hope this helps.

Regds

Re: vgscan doesn't update lvmtab correctly

Tim Leong_1 — Tue, 13 Apr 2004 14:04:33 GMT

Returns nothing...

Re: vgscan doesn't update lvmtab correctly

Sanjay_6 — Tue, 13 Apr 2004 14:15:25 GMT

Hi,

Can you post your bdf output ?.

Regds

Re: vgscan doesn't update lvmtab correctly

Tim Leong_1 — Tue, 13 Apr 2004 14:30:20 GMT

/dev/root 143360 92469 48118 66% /
/dev/vg00/lvol1 83733 43404 31955 58% /stand
/dev/vg00/lvol7 1048576 169928 831122 17% /var
/dev/vg00/lvol6 1048576 954265 90692 91% /usr
/dev/vg00/lvol5 524288 16965 476092 3% /tmp
/dev/vg00/lvol4 1548288 1338397 196780 87% /opt
/dev/vg04/lvol 87947160 56113656 23038784 71% /disk3
/dev/vg03/lvol 87947160 59156088 19996352 75% /disk2
/dev/vg02/lvol 8847360 7304150 1496146 83% /apps

Re: vgscan doesn't update lvmtab correctly

Jeff Schussele — Tue, 13 Apr 2004 15:12:33 GMT

Hi (again) Tim,

Well that bdf output looks to me like the system was not rebooted properly from LVM maintenance mode. / is typically mounted from /dev/vg00/lvol3.
If that's the case you'll have to verify that /etc/fstab & /dev/vg00/* are correct & then schedule a reboot to correct the situation. You're going to have trouble because what's defined to the system & what's actually mounted don't match.

Rgds,
Jeff

Re: vgscan doesn't update lvmtab correctly

KapilRaj — Wed, 14 Apr 2004 00:25:33 GMT

rm /etc/mnttab
mount -a
vgscan

Can you try this way please

Kaps

Re: vgscan doesn't update lvmtab correctly

SureshKumar_2 — Wed, 14 Apr 2004 01:12:47 GMT

Hi

Before u removing /etc/mnttab, check whether u have entry /dev/root. If it exists then only u can proceed further.

Re: vgscan doesn't update lvmtab correctly

Tim Leong_1 — Wed, 14 Apr 2004 06:53:58 GMT

Thanks to everyone for your replies. This has been really helpful.

After removing mnttab and running mount -a, / is now mounted from vg00/lvol3. But vgscan -av still doesn't update the lvmtab correctly. Two of my volume groups are giving these errors:

Couldn't stat physical volume "/dev/dsk/c1t2d0":
Invalid argument
Couldn't stat physical volume "/dev/dsk/c2t0d0":
Invalid argument
Couldn't stat physical volume "/dev/dsk/c3t2d0":
Invalid argument

vgscan: has no correspoding valid raw device file under /dev/rdsk.
Verification of unique LVM disk id on each disk in the volume group
/dev/vg00 failed.

Do I need to boot into LVM maintenance mode to fix this? If I reboot, will / even mount?

Re: vgscan doesn't update lvmtab correctly

Elmar P. Kolkman — Wed, 14 Apr 2004 07:30:03 GMT

Depends on the output of lvlnboot -v.

Also make sure you're disks are still working (those messages about none-responding disks are alarming). Check the output of ioscan -fnC disk. If you see a lot of NO_HW entries, check your disk(cabinet)s for broaken power supplies or loose SCSI cables before doing the reboot.

Re: vgscan doesn't update lvmtab correctly

Tim Leong_1 — Wed, 14 Apr 2004 08:10:55 GMT

I think that's the problem. I'm getting NO_HW on 2 of the disks in vg00. AFter running "cat /dev/dsk/c1t2d0 > /dev/null", I'm getting I/O errors. Ugh. Sounds like total system rebuild time.

Re: vgscan doesn't update lvmtab correctly

Bill Hassell — Wed, 14 Apr 2004 09:18:41 GMT

The key is the missing physical disks mentioned in vgscan. The disks are dead (electronically) so you have some serious hardware problems. If multiple disks are involved, check for a common feature such as the same cable string (controller). Sounds like you might have an Ignite/UX backup. That would make restoring the system to a complete set of new disks about a 1/2 day job.

Re: vgscan doesn't update lvmtab correctly

Bill Hassell — Wed, 14 Apr 2004 09:18:54 GMT

The key is the missing physical disks mentioned in vgscan. The disks are dead (electronically) so you have some serious hardware problems. If multiple disks are involved, check for a common feature such as the same cable string (controller). Sounds like you might not have an Ignite/UX backup. That would make restoring the system to a complete set of new disks about a 1/2 day job.

Re: vgscan doesn't update lvmtab correctly

Tim Leong_1 — Wed, 14 Apr 2004 09:24:20 GMT

Unfortunately, these are internal disks attached through the SCA interface. Through pvdisplay and lvdisplay, I've found that that one of the disks is on one filesystem and the other is distributed amongst many FS's and they both show STALE extents. I guess that means they are pretty much dead.

I've also determined that the reason for the failure is the temperature around the system. Air flow isn't too good where the machine is, so I'm looking to change its location.

Re: vgscan doesn't update lvmtab correctly

Bill Hassell — Wed, 14 Apr 2004 12:07:01 GMT

Wow, I hope these are cheap disks. Air conditioning and temperature control is crucial to reliable disk operation. Electronics (and especially mechanical devices like disks) degrdae with temperature so the damage is already done and will only get worse on other disks. IF this is a very expensive disk array, run, don't walk to the CEO of your company and state that total loss of the disk farm and most of the computers is a possibility because of the poor air conditioning design.