topic Re: cross device link issue in Operating System - HP-UX

cross device link issue

kholikt — Mon, 08 Jan 2007 00:44:28 GMT

Hi,

I have two nodes running MC/SG connect to EMC Clariion. I have a volume that I cannot mounted and I am getting the following error message. This volume is using EMC snap view to create a snapshot from another VG. I suspect it was due to snapshot the two VG has two same VGID that's why it cannot be mounted. Any opinion.

sm1a# vgchange -a e /dev/backupvg00

vgchange: Warning: Couldn't attach to the volume group physical volume "/dev/dsk/c5t9d2":

Cross-device link

vgchange: Activation mode requested for the volume group "/dev/backupvg00" conflicts with configured mode.

vgchange: Warning: couldn't query physical volume "/dev/dsk/c5t9d2":

The specified path does not correspond to physical volume attached to

this volume group

vgchange: Warning: couldn't query all of the physical volumes.

Re: cross device link issue

Steven E. Protter — Mon, 08 Jan 2007 01:06:04 GMT

Shalom,

I've run into this with SG a few times. First make sure the snapshot operation is really done.

Possible solutions:

http://www.docs.hp.com/en/A3262-90051/A3262-90051.pdf
http://forums1.itrc.hp.com/service/forums/questionanswer.do?threadId=1025950
http://forums1.itrc.hp.com/service/forums/questionanswer.do?threadId=1025994
http://forums1.itrc.hp.com/service/forums/questionanswer.do?threadId=1042689

I'm not sure I found the exact solution because the cause can be different. I recall a simple two step vgchange solution cleaning this up. It's probably in the pdf I posted first.

SEP

Re: cross device link issue

Kevin Wright — Thu, 11 Jan 2007 12:23:39 GMT

see vgchid

Re: cross device link issue

A. Clay Stephenson — Thu, 11 Jan 2007 13:10:59 GMT

0) make sure that the minor device numbers on all nodes are unique. It's ok to have the same minor device number (e.g.) 0x050000 for /dev/vg*/group on different nodes but there can be at most one 0x050000 any one node. Your first task is to do an ls -l /dev/vg*/group on all the nodes and make sure that there are no dupicate minor device numbers on a node. This can lead to extremely bizarre and chaotic behavior.

1) Make sure that you do an ioscan -fn after connecting new disks and then do an insf to create the device nodes.