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

vgscan error

Carme Torca — Thu, 05 Jun 2003 07:12:15 GMT

Hi,

I have three vg in the system:
vg00
c1t2d0
c2t2d0
vg02
/dev/dsk/c4t0d7 alternate link /dev/dsk/c6t0d7
vgias
/dev/dsk/c4t1d0 alternate link /dev/dsk/c6t1d0
But when I do and vgscan, it displays:

Verification of unique LVM disk id on each disk in the volume group /dev/vg02 failed.

Following are the sets of disks having identical LVM disk id /dev/dsk/c6t0d7 /dev/dsk/c4t2d0 /dev/dsk/c6t2d0

And the lvmtab, don't create vg02.
What's is wrong?
Thanks,
Carmen.

Re: vgscan error

Michael Tully — Thu, 05 Jun 2003 07:22:14 GMT

Hi Carmwn,

Please post a copy of:

# vgdisplay -v /dev/vg02
and
# ioscan -fnC disk

Regards
Michael
"When I have trouble spelling, it's called fat finger syndrome."

Re: vgscan error

Karthik S S — Thu, 05 Jun 2003 07:28:54 GMT

Hi,

try to do a vgimport,

vgimport -A y vg02 /dev/dsk/c4t0d7

Regards,
Karthik

Re: vgscan error

Carme Torca — Thu, 05 Jun 2003 07:30:39 GMT

Re: vgscan error

Zeev Schultz — Thu, 05 Jun 2003 07:44:43 GMT

Ok,from vgdisplay can be seen only 1 PV
with alternative link.Vgscan probably found
the same VG_ID on /dev/dsk/c4t2d0 & c6t2d0.
That can be due to BC feature of EMC and should
run vgchgid.
Another thing is NO_HW state of 3 luns (as seen in the ioscan output).Would check this one too.
Vgreduce can be used to reduce pv alt links.

Zeev

Re: vgscan error

Bill McNAMARA_1 — Thu, 05 Jun 2003 07:47:17 GMT

vgscan is a dangerous tool when you have pvlinks (alt paths) use vgimport as suggested.

Re: vgscan error

Eugeny Brychkov — Thu, 05 Jun 2003 07:50:34 GMT

This can happen if for some reason LVM disk contents were exactly copied to another disk. Thus when scanning vgscan can not resolve which disk is original and should be used and which should be discarded.
Please make sure if you did 'dd' from one LUN to another (LUNs #7 and #16 within EMC disk array) or made a business copy or LUN screenshou you've changed volume id using pvchgid (or something like this)
Eugeny

Re: vgscan error

Carme Torca — Thu, 05 Jun 2003 08:18:15 GMT

Hi,
Then if I do:

vgchgid /dev/desk/c4t2d0 /dev/dsk/c6t2d0

I could resolv the problem?
This two disks c4t2d0 and c6t2d0 doesn't have one vg assigned.

Thanks.