Cannot vgchange -a y

[Lai Nee Shyang_1]

Hi there,

I got this error message while I try to do vgchange -a y for a vg :
DWPRD:/home/smolns # vgchange -a y vg01
vgchange: Warning: Couldn't attach to the volume group physical volume "/dev/dsk
/c6t8d0":
Cross-device link
vgchange: Warning: couldn't query physical volume "/dev/dsk/c6t8d0":
The specified path does not correspond to physical volume attached to
this volume group
vgchange: Warning: couldn't query all of the physical volumes.
vgchange: Couldn't activate volume group "vg01":
Quorum not present, or some physical volume(s) are missing.

I did ioscan and the device is still can be detected.
Any suggestions ?

Thanks

Lai

[S.K. Chan]

Try activatiing it by setting the quorum check OFF.

# vgchange -a y -q n /dev/vg01

.. ses if it's ok. When it comes up verify if the disk is ok ..

# /etc/diskinfo /dev/rdsk/c6t8d0

.. does that respond with anything ?

[Sukant Naik]

Hi Lai,

Looks like the server is not able to read the contents of the disk. There are two possibilities.


1. Disk is loosely connected:
The best way is to shutdown the server. Pull the disk out and plug it in, provided it is a pluggable device. OR check the SCSI cables of the disk.

Then reboot. It will be fine.

2. Disk has gone bad
After the reboot is over do
# dd if=/dev/rdsk/c6t8d0 of=/dev/null bs=4k

-Sukant

[Michael Tully]

Hi,

Sounds like you've tried to import a volume group? In any case you can't activate a volume group unless it has at 50% of the physical volumes available.

There are two suggestions that come readily to mind.

# diskinfo /dev/rdsk/c6t8d0

# dd if=/dev/dsk/c6t8d0 of=/dev/null

If either give errors, it could your disk is no good.

HTH
~Michael~

[Patrick Wallek]

I think the key here is the 'cross-device link' error message. Are you trying to mount a bcv from an EMC array by chance?

Have a look at document 2200144037 from the TKB. I have attached it for your convenience.

[S.K. Chan]

Another possible reason (apart from suspected faulty disk) is that you got VGs claiming the same PV (disk). To verify this look at /etc/lvmtab file.
# strings /etc/lvmtab
==> Do you see c6t8d0 belonging to 2 different VGs? If the anser is yes do this to rebuild the lvmtab file ..

# cd /etc
# mv lvmtab lvmtab.org
# vgscan -v
# strings lvmtab
==> check again

Now try ..

# vgchange -a y vg01

[Lai Nee Shyang_1]

Hi this is what I get from diskinfo and vgchange

DWPRD:/home/smolns # vgchange -a y -q n /dev/vg01
vgchange: Warning: Couldn't attach to the volume group physical volume "/dev/dsk
/c6t8d0":
Cross-device link
vgchange: Warning: couldn't query physical volume "/dev/dsk/c6t8d0":
The specified path does not correspond to physical volume attached to
this volume group
vgchange: Warning: couldn't query all of the physical volumes.
vgchange: Couldn't activate volume group "/dev/vg01":
Quorum not present, or some physical volume(s) are missing.

DWPRD:/home/smolns # diskinfo /dev/rdsk/c6t8d0
SCSI describe of /dev/rdsk/c6t8d0:
vendor: EMC
product id: SYMMETRIX
type: direct access
size: 8838720 Kbytes
thanks

[T G Manikandan · Accepted solution]

Hello
I assume that the vg info was lost.

Can you do a
#vgcfgrestore -n /dev/vg01 /dev/rdsk/c6t8d0

check for the man pages of the vgcfgrestore.


Thanks
G Manikandan

[T G Manikandan]

Also check this link

http://bizforums.itrc.hp.com/cm/QuestionAnswer/1,,0xb0a503bbece8d5118ff40090279cd0f9,00.html

Thanks

[Lai Nee Shyang_1]

Yess!! Thank you Mr. T G Manikandan . The vgcfgrestore fix the vg and now I can activate it.

Thank you sir !

Lai