topic Re: Moving scsi array between servers in Operating System - HP-UX

Moving scsi array between servers

MikeL_4 — Wed, 03 Aug 2005 18:13:21 GMT

I have a scsi disk array on a server with a volume group defined with over 200Gb of data that I need to move to another server.

Could you give me the proper steps to accomplish this. I know I can do a vgexport, disconnect the scsi array and move it to the new server, then vgimport, but the disk devices will undoubtly have a new names, how do I handle that ??

Thanks

Re: Moving scsi array between servers

S.Arunkumar — Wed, 03 Aug 2005 18:37:55 GMT

Hi MIKE

If you have only one Vg configured into this Array for the server then .I dont think so there is much issues in this.
You can go ahead for vgexport and vgimport in the second m/c.

Even if you have multiple Vg's.Then note down the Lun no of these disks.Since these will not change even if your disk path got changed.i.e c1t0d?.So you mark down the disks of each Vg and do the vgimport in the same disk.

Regards
S.Arunkumar

Re: Moving scsi array between servers

Denver Osborn — Wed, 03 Aug 2005 19:49:18 GMT

You can export the vg in preview mode to generate a map file, then move the array to the new node and import the vg...

current node:
# vgexport -p -v -s -m /tmp/vgname.map /dev/vgname
# scp /tmp/vgname.map newnode:/tmp
(unmount f/s for vg)
# vgchange -a n /dev/vgname
(shutdown/disconnect array)

new node:
after you've attach array...
# mkdir /dev/vgname
# mknod /dev/vgname/group c 64 0x??0000
# vgimport -p -v -s -m /tmp/vgname.map /dev/vgname

Using the export/import with a map file and the -s option for the vgid, you won't have to fiddle with mapping out new disk dev files.

Also save the actual export from the current node until you verify the array's new home is up and running well. Once all is well, go back to the current (old) node and do the vgexport. "vgexport -v /dev/vgname"

Of course if you run into trouble with the new node, just backou by putting the array back on the other node and do your vgchange -a y /dev/vgname. If you plan on keeping it on the old node for a bit, you may want to setup your /etc/lvmrc to exclude the old vg.

Hope this helps w/ your task,
-denver

Re: Moving scsi array between servers

MikeL_4 — Thu, 04 Aug 2005 06:37:15 GMT

Thanks alot...