topic Re: vgscan error in Operating System - HP-UX

vgscan error

dictum9 — Wed, 31 May 2006 15:26:28 GMT

I get this error with vgscan. It does not generate the /etc/lvmtab file.

# vgscan -a
vgscan: The physical volume "/dev/dsk/c2t0d0s2" is already recorded in the "/etc/lvmtab" file.
vgscan: The physical volume "/dev/dsk/c2t1d0s2" is already recorded in the "/etc/lvmtab" file.
Couldn't stat physical volume "/dev/dsk/c0t0d0":
Invalid argument
Physical Volume "/dev/dsk/c3t2d0" contains no LVM information

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.

# ioscan -funC disk
Class I H/W Path Driver S/W State H/W Type Description
============================================================================
disk 0 0/0/2/0.0.0.0 sdisk CLAIMED DEVICE TEAC DV-28E-B
/dev/dsk/c0t0d0 /dev/rdsk/c0t0d0
disk 1 0/1/1/0.0.0 sdisk CLAIMED DEVICE HP 73.4GST373454LC
/dev/dsk/c2t0d0 /dev/dsk/c2t0d0s3 /dev/rdsk/c2t0d0s2
/dev/dsk/c2t0d0s1 /dev/rdsk/c2t0d0 /dev/rdsk/c2t0d0s3
/dev/dsk/c2t0d0s2 /dev/rdsk/c2t0d0s1
disk 2 0/1/1/0.1.0 sdisk CLAIMED DEVICE HP 73.4GST373454LC
/dev/dsk/c2t1d0 /dev/dsk/c2t1d0s3 /dev/rdsk/c2t1d0s2
/dev/dsk/c2t1d0s1 /dev/rdsk/c2t1d0 /dev/rdsk/c2t1d0s3
/dev/dsk/c2t1d0s2 /dev/rdsk/c2t1d0s1
disk 3 0/1/1/1.2.0 sdisk CLAIMED DEVICE HP 73.4GST373454LC
/dev/dsk/c3t2d0 /dev/rdsk/c3t2d0

# vgdisplay -v vg00

. . .

--- Physical volumes ---
PV Name /dev/dsk/c2t1d0s2
PV Status available
Total PE 4318
Free PE 1719
Autoswitch On

PV Name /dev/dsk/c2t0d0s2
PV Status available
Total PE 4318
Free PE 4268
Autoswitch On

Re: vgscan error

Rick Garland — Wed, 31 May 2006 15:28:36 GMT

Make a copy of the lvmtab file presently in place. Move it out of the way. Do the vgscan as before. Should create a new lvmtab file.

Re: vgscan error

dictum9 — Wed, 31 May 2006 15:31:56 GMT

It does not. I already tried that and it does not create the file. Actually it creates a file 12 bytes in size containing apparently nothing readable when I run "strings" on it.

This is an Itanium machine. I never did anything with /dev/dsk/c2t0d0, instead I worked with /dev/dsk/c2t0d0s2. It's looking for /dev/dsk/c2t0d0 and cannnot find it.

Re: vgscan error

Rick Garland — Wed, 31 May 2006 15:34:05 GMT

If you run the vgscan with the -v switch (verbose) and additional messages?

Re: vgscan error

dictum9 — Wed, 31 May 2006 15:38:11 GMT

# vgscan -a -v
vgscan: The physical volume "/dev/dsk/c2t0d0s2" is already recorded in the "/etc/lvmtab" file.
vgscan: The physical volume "/dev/dsk/c2t1d0s2" is already recorded in the "/etc/lvmtab" file.
Couldn't stat physical volume "/dev/dsk/c0t0d0":
Invalid argument
Physical Volume "/dev/dsk/c3t2d0" contains no LVM information

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.

Scan of Physical Volumes Complete.

# ll /dev/rdsk/*
crw-r----- 1 bin sys 188 0x000000 May 16 18:43 /dev/rdsk/c0t0d0
crw-r----- 1 bin sys 188 0x020000 May 22 09:51 /dev/rdsk/c2t0d0
crw-r----- 1 bin sys 188 0x020001 May 22 09:58 /dev/rdsk/c2t0d0s1
crw-r----- 1 bin sys 188 0x020002 May 22 10:10 /dev/rdsk/c2t0d0s2
crw-r----- 1 bin sys 188 0x020003 May 22 09:45 /dev/rdsk/c2t0d0s3
crw-r----- 1 bin sys 188 0x021000 May 16 18:43 /dev/rdsk/c2t1d0
crw-r----- 1 bin sys 188 0x021001 May 16 18:43 /dev/rdsk/c2t1d0s1
crw-r----- 1 bin sys 188 0x021002 May 31 16:04 /dev/rdsk/c2t1d0s2
crw-r----- 1 bin sys 188 0x021003 May 16 18:43 /dev/rdsk/c2t1d0s3
crw-r----- 1 bin sys 188 0x032000 May 16 18:43 /dev/rdsk/c3t2d0

Re: vgscan error

Torsten. — Wed, 31 May 2006 15:46:06 GMT

"It's looking for /dev/dsk/c2t0d0"

Where?

Disks are not mirrored. Why you do a vgscan?
/dev/rdsk/c0t0d0 has no LVM information - it's true, because it's a DVD. Where is the problem, sorry - can't see at this moment.

Re: vgscan error

dictum9 — Wed, 31 May 2006 15:53:55 GMT

1) /dev/dsk/c0t0d0 is a DVD, it is not a problem.

2) /dev/dsk/c3t2d0 is not even initialized into any volume groups, it's not a problem.

3) The problem is /dev/dsk/c2t0d0.
When I try to mirror to it, I get it:

# lvextend -m 1 /dev/vg00/lvol2 /dev/dsk/c2t0d0s2
lvextend: Warning: couldn't query physical volume "/dev/dsk/c2t0d0":
The specified path does not correspond to physical volume attached to
this volume group
lvextend: Warning: couldn't query all of the physical volumes.

Which makes me think there is a problem with /etc/lvmtab. When I try to recreate /etc/lvmtab, vgscan fails to do so.

Re: vgscan error

Rick Garland — Wed, 31 May 2006 15:59:05 GMT

With the format of the disk device you are referring to, is this a Veritas disk?

Are you using LVM commands againest a disk under Veritas control?

Re: vgscan error

Michael Steele_2 — Wed, 31 May 2006 15:59:12 GMT

You can recreate the /etc/lvmtab file with vgexport and vgimport. vgexport will remove the volume group from /etc/lvmtab.

verify the vg map

vgcfgrestore -f /dev/lvmconf/vgXX.map -l

vgexport -v -p -s -m /etc/lvmconf/vgXX.map /dev/vgXX

(-p preview)

vgchange -a n /dev/vgXX
vgexport -v -s -m ....

Now rebuild the vg directory.

mkdir /dev/vgXX
mknod /dev/vgXX/group c 64 0x0?000

And re-import the exported map.

vgimport -v -m /etc/lvmconf/vgXX.map /dev/vgXX /dev/dsk/cXtXdX <.> <.>
<.> all the associated extended disks that are needed.

vgchange -a y /dev/vgXX

Re: vgscan error

James R. Ferguson — Wed, 31 May 2006 16:00:28 GMT

Hi:

Did you prepare the disk for mirroring, correctly? The steps for Itanium are a bit different from PA-RISC. See Appendix-A in:

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

Regards!

...JRF...

Re: vgscan error

dictum9 — Wed, 31 May 2006 16:23:49 GMT

Rick Garland,

> With the format of the disk device you are referring to, is this a
> Veritas disk?

> Are you using LVM commands againest a disk under Veritas control?

I am not using any Veritas disks.
This is an Itanium box and instructions in it said to create the
/dev/dsk/c2t1d0s2 partition.

Michael Steele,

I don't feel comfortable exporting the vg00 volume group. I don't think
that's the problem. I don't have any other VGs.

James R. Ferguson,

The problem is not mirroring. When I run vgdisplay, I get:

vgdisplay: Warning: couldn't query physical volume "/dev/dsk/c2t0d0":

That's obviously the source of the problem. I did follow the instructions
on page 26 "Mirroring the Root Volume on Integrity Servers", but again,
I am having issues before I even get to the mirroring part.
Do you think that's the problem, that I didn't initialize it correctly?
I can try to redo the procedure. How do I confirm that it's all right?

Re: vgscan error

Sanjay_6 — Wed, 31 May 2006 18:00:07 GMT

Hi,

Try this link,

http://www2.itrc.hp.com/service/cki/search.do?category=c0&prevQueryString=&mode=text&searchString=vgscan+itanium&searchCrit=allwords&docType=Security&docType=Patch&docType=EngineerNotes&docType=BugReports&docType=Hardware&docType=ReferenceMaterials&docType=ThirdParty&dateRange=all&search.x=22&search.y=12

The ITRC doc id is IA64KBRC00016768.

Hope this helps.

regds

Re: vgscan error

James R. Ferguson — Wed, 31 May 2006 19:02:46 GMT

Hi:

Wait. Can you do (without error):

# dd if=/dev/rdsk/c2t0d0 of=/dev/null bs=64k count=10000

Also, does the disk show CLAMIMED if you do a full 'ioscan' without the '-k' switch?

# ioscan -fnC disk

Lastly, are you mirroring and do you see any "stale" extents if you do:

# lvdisplay -v /dev/vg00/lvolX

...for every X that is mirrored?

What made you attempt a 'vgscan' in the first place?

Regards!

...JRF...

Re: vgscan error

Darrel Louis — Wed, 31 May 2006 23:16:10 GMT

Hi,

Is this a cluster environment?
If yes you should also remove the foloowing file /dev/slvmvg, because the file has the same minor number as vg00.

If this is a cluster, steps to follow:
# mv /etc/lvmtab
# rm /dev/slvmvg
# vgscan -a -v
# vgchange -a y
# lvlnboot -R
# mknod /dev/slvmvg c 64 0x000000

GoodLuck

Darrel

Re: vgscan error

Michael Steele_2 — Thu, 01 Jun 2006 06:36:13 GMT

Given :

"...I don't feel comfortable exporting the vg00 volume group. I don't have any other VGs..."

I think you should find a recent ignite recovery tape and once you've resinstalled the O/S move your data out of vg00 and into their own vgs.

Good Luck

Re: vgscan error

Ninad_1 — Thu, 01 Jun 2006 07:01:15 GMT

Can you try mirroing without specifying the disk name
lvextend -m 1 /dev/vg00/lvol2
to see if it is performing the mirroring taking the other disk on its own.

Regards,
Ninad

Re: vgscan error

dictum9 — Thu, 01 Jun 2006 11:01:12 GMT

Sanjay,

I cannot get to the link

James Ferguson,

I can do dd without error

# dd if=/dev/rdsk/c2t0d0 of=/dev/null bs=64k count=10000
10000+0 records in
10000+0 records out

The disk does show up claimed if I do ioscan -f

I do not see any stale extents

I attempted to do vgscan because I get an error message when I do vgdisplay.
Why am
I not being able to recreate /etc/lvmtab?

Darrel,

It's not a cluster

Re: vgscan error

Ninad_1 — Thu, 01 Jun 2006 11:10:54 GMT

OK. I would suggest you to try this.

1. Remove all mirrors of volumes which are having mirror on disk c2t0d0 using lvreduce -m 0 [ for all mirrored volumes ]
2. remove disk c2t0d0 from VG using vgreduce
3. readd disk into VG and create the mirrors

Regards,
Ninad

Re: vgscan error

dictum9 — Thu, 01 Jun 2006 11:43:03 GMT

I removed the second disk so I am only left with primary disk. Why is it giving me this error message when I do vgdisplay?

vgdisplay: Warning: couldn't query physical volume "/dev/dsk/c2t0d0":
The specified path does not correspond to physical volume attached to
this volume group
vgdisplay: Warning: couldn't query all of the physical volumes.

Re: vgscan error

dictum9 — Thu, 01 Jun 2006 11:46:24 GMT

BTW page 32 of "when good disks go bad" talks about exactly this error message, "couldn't query physical volume"

Their solution is to restore a good config

recreate the VG and its LVs

export and reimport the VG

The question is, does all of this apply if the VG is vg00?!