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Full Discussion: Volume Groups and the SAN
Operating Systems AIX Volume Groups and the SAN Post 302174219 by mhenryj on Monday 10th of March 2008 11:52:30 AM
Old 03-10-2008
Volume Groups and the SAN

Hello all. I have a perplexing problem

I have an AIX 5.1 system on an EMC SAN.

This system had been on a CX400 SAN for several years. The system was migrated to a CX700 just over a week ago. The migration consisted of utilizing on of the HBAs in the system and connecting to both SANs

The VGs were expaned and mirrored. Then the VGs were reduced and the old SAN removed. Then both HBA being connected to the new CX700.

Since the migration, when the system is booted, the VGs on the SAN do not come up active (this has happened twice), and, of course, the file systems don't mount.

I can export the VGs, import them, fix the /etc/filesystems file and then mount all of the FSs, but this is a pain.

The VGs are set to auto mount

Any insight into what might be happening is appreciated.

Thanks
Mike
 

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VGRENAME(8)						      System Manager's Manual						       VGRENAME(8)

NAME
vgrename - rename a volume group SYNOPSIS
vgrename [-A|--autobackup y|n] [-d|--debug] [-h|-?|--help] [-t|--test] [-v|--verbose] OldVolumeGroup{Path|Name|UUID} NewVol- umeGroup{Path|Name} DESCRIPTION
vgrename renames an existing (see vgcreate(8) ) volume group from OldVolumeGroup{Name|Path|UUID} to NewVolumeGroup{Name|Path}. OPTIONS
See lvm for common options. Examples "vgrename /dev/vg02 /dev/my_volume_group" renames existing volume group "vg02" to "my_volume_group". "vgrename vg02 my_volume_group" does the same. "vgrename Zvlifi-Ep3t-e0Ng-U42h-o0ye-KHu1-nl7Ns4 VolGroup00_tmp" changes the name of the Volume Group with UUID Zvlifi-Ep3t-e0Ng-U42h-o0ye-KHu1-nl7Ns4 to "VolGroup00_tmp". All the Volume Groups visible to a system need to have different names. Otherwise many LVM2 commands will refuse to run or give warning messages. This situation could arise when disks are moved between machines. If a disk is connected and it contains a Volume Group with the same name as the Volume Group containing your root filesystem the machine might not even boot correctly. However, the two Volume Groups should have different UUIDs (unless the disk was cloned) so you can rename one of the conflicting Volume Groups with vgrename. SEE ALSO lvm(8), vgchange(8), vgcreate(8), lvrename(8) Sistina Software UK LVM TOOLS 2.02.95(2) (2012-03-06) VGRENAME(8)
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