How to reclaim hard disks and IP's in AIX? Post: 302989432

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Operating Systems AIX How to reclaim hard disks and IP's in AIX? Post 302989432 by bakunin on Thursday 12th of January 2017 10:37:05 AM

01-12-2017

Registered User

Quote:

Originally Posted by Joseph Sabo

Now, since the file systems belong to a Volume group I am assuming I would need to take the VG offline and remove the file systems via smitty. Since the disk belongs to a SAN, I would need to remove the disk definition from ODM and erase the path.

In AIX all (really all) filesystems are managed by a logical volume manager. As a rule of thumb you have:

- one or more filesystems belong to a volume group
- one or more disks provide the space for this volume group (each disk belongs to exactly one VG)

If a system is set up sensibly volume groups build logical groups of FSes, i.e. all FSes for one application are in one VG. Therefore you most probably want to remove all FSes from one VG.

If so:

- lsvg -p to get the disks belonging to the VG (man lsvg). Write these down.
- umount all the FSes in question.
- varyoff the VG after unmounting all the FSes in it. (man varyoffvg)
- export the VG (man exportvg)

The last command will remove the FS definitions from /etc/filesystems as well as the VG. Finally you can remove the disk(s) which (formerly) belonged to the VG:

- rmdev -Rdl <disk> (man rmdev)

Afterwards remove the zoning/LUNs and it might be necessary to remove the disks from the VIOS too (if they are vSCSI).

Finally do a cfgmgr on teh LPAR to make sure the disks are out of the system cleanly (if some artefacts are configured again you know you have more work to do).

Note, that there was a lot of assuming going on when writing this. In principle the procedure will cover the most common cases but you might have to change details for i.e. EMC SAN running PowerPath drivers, etc., so as long as we have no detailed description of your system we can#t tell you in all detail what to do and how.

I hope this helps.

bakunin

bakunin

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vgreduce

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

NAME

       vgreduce - reduce a volume group

SYNOPSIS

       vgreduce  [-a|--all] [-A|--autobackup y|n] [-d|--debug] [-h|-?|--help] [--removemissing] [-t|--test] [-v|--verbose] VolumeGroupName [Physi-
       calVolumePath...]

DESCRIPTION

       vgreduce allows you to remove one or more unused physical volumes from a volume group.

OPTIONS

       See lvm for common options.

       -a, --all
	      Removes all empty physical volumes if none are given on command line.

       --removemissing
	      Removes all missing physical volumes from the volume group, if there are no logical volumes allocated on those. This resumes  normal
	      operation of the volume group (new logical volumes may again be created, changed and so on).

	      If this is not possible (there are logical volumes referencing the missing physical volumes) and you cannot or do not want to remove
	      them manually, you can run this option with --force to have vgreduce remove any partial LVs.

	      Any logical volumes and dependent snapshots that were partly on the missing disks get removed completely. This includes those  parts
	      that lie on disks that are still present.

	      If your logical volumes spanned several disks including the ones that are lost, you might want to try to salvage data first by acti-
	      vating your logical volumes with --partial as described in lvm (8).

SEE ALSO

       lvm(8), vgextend(8)

Sistina Software UK					 LVM TOOLS 2.02.95(2) (2012-03-06)					       VGREDUCE(8)