I have a LUN (From HP-Storage VA7110) that is claimed on 2 servers, but is in used in one of the VG on Server-1 .
Now I want to shut Server-1 and re-use that LUN on server-2 .
Am new on HP-UX, confused with right steps .
1. Do I need to format LUN: /dev/rdsk/c4t0d1 before reuse with new VG on server-2
2. If need to format, what command I can use safely
3. Also I want alternate path to be available with new VG as well, so is below syntax is right .
On Server-2
--Shirish Shukla
Last edited by Shirishlnx; 08-17-2012 at 08:58 AM..
You will need to run on server-1 (on which you want to remove the LUN from)
1. vgdisplay -v the group, and write down the LUN's/disks that are used in it.
2. vgexporton that volume group.
3. pvremove on disks that are inside that volume group.
4. Depresent the disks from storage side.
5. Run ioscan -fnC disk, and check for NO_HW
6. Run rmsf -H on NO_HW devices
You have now removed the Lun(s) from server1.
Present the lun's to server 2, run ioscan -fnC disk.
If you are running v2, you will need to run insf -e to create devices, on v3 they will be created after ioscan.
Verify the results with xpinfo, or similar tool.
Run pvcreate on those rdsks created (you don't need -f if you ran pvremove on server1), only per one path is enough of course.
Use the LUN in new or existing volume group.
Notice, if you are running v2 and you are using multipath, you will need to add both paths in your volume group via vgextend (existing) or vgcreate (new).
This is because the new disks that you are adding have the same LVM id as existing ones on machine
Are you sure this is not a serviceguard cluster or some storage based cloning like truecopy or business copy ?
If you are sure those are the disks you want to use...
Notice rdsk when using vgchgid and dsk in vgimport.
You will not use -m or -s in this case.
Just please, be sure about your operations and what are you trying to achive, since this looks like some volume group migration from one host to another, rather then reusing of existing luns.
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