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Old 05-09-2006, 09:22 AM   #1
looseCannon
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Registered: Dec 2003
Location: Little Rock, AR
Distribution: Fedora Core 2, AIX, HP-UX, Solaris, Whitebox
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Where is the PVID stored


Quick background on all this before the real question is asked.

A couple of weeks back I configured an HACMP cluster between to servers with SAN based shared storage. Now that the cluster is up and functional with no problems an issue with the EMC frame comes up. The only fix for the problem, according to the SAN guys, is to move everything over to a new frame.

My concern with moving the disks to a new frame is regarding the PVIDs. If those change then HACMP will have to reconfigured, if they don't change then there is very little for me to do other than to shutdown the cluster and reboot the servers.

So, the big question(s) is/are:

Where is the PVID stored?
Will this break HACMP?
 
Old 05-09-2006, 01:58 PM   #2
Michael AM
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The PVID is part of the VGDA (volumn group descriptor area).

I dont know about ECM, or Frames, but it shouldnt break HACMP in anyway.

Two basic safety things to do though: make a snapshot of your HACMP cluster. This should at least help greatly if you need to rebuild.

And, if at all possible save your volumn groups to a backup to tape or as a large file. The best command for this will be:
savevg -f <SomeBackupStorage> <your_vg_name>

If you backup to a large file, make sure you have ulimits set to -1 (no limits). The defaults will cause a backup to a file to fail generally.
Defaults:
michael@x054:[/home/michael]ulimit -a
time(seconds) unlimited
file(blocks) unlimited
data(kbytes) 131072
stack(kbytes) 32768
memory(kbytes) 32768
coredump(blocks) 2097151
nofiles(descriptors) 2000
 
  


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