Clone or mirror your AIX OS larger disk to smaller disk ? Post: 302751993

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Operating Systems AIX Clone or mirror your AIX OS larger disk to smaller disk ? Post 302751993 by MichaelFelt on Saturday 5th of January 2013 08:10:34 AM

01-05-2013

Registered User

It took me too long to find the term I was looking for - kept thinking multi-boot (which is for something else!).

I think what you might be looking for is multibos. The trouble is going to continue to be that /backup is in rootvg and I do not know if it will be available on a second boot (with the multibos)

In short, what multibos does is copy the current rootvg (key) logical volumes - giving them different names (much like alt_disk_install does, but now within the current volume group).

Assumming /backup (since it is not a default rootvg logical volume) will be available after a reboot to the "other" rootvg you could attempt, assuming the sum of the current PP sizes are less than 10G:

Code:

1. Backup /backup to other medium
2. Add 10G disk to rootvg
3. Use multibos procedure to copy current rootvg key logical partitions to 10G disk.
4. reboot to 10G disk
5. remove other copy of rootvg and /backup
6. remove disk from rootvg (reducevg)
7. Create new volume group for backups
8. Restore /backup to new volume group.

For more on multibos look at two articles on IBM Systems Magazine: AIX-Updates-With-Multibos/ and Working with Multibos

However, I would also consider using the information above from ka00na and zxmaus to "almost" use mirrorvg - by just adding the key AIX partitions
to the 10G disk, backup and remove /backup; then remove the copies on original disk; and restore /backup - roughly this:

Code:

# extendvg rootvg hdisk1
# for i in hd1 hd2 hd3 hd4 hd5 hd6 hd7 hd8 hd9var hd10opt hd11admin lg_dumplv hd12audit
do
mklvcopy $i 2 hdisk1
done
# bosboot -ad hdisk1
# echo do backup of whatever needs backing up
# for i in hd1 hd2 hd3 hd4 hd5 hd6 hd7 hd8 hd9var hd10opt hd11admin lg_dumplv hd12audit
do
rmlvcopy $i 1 hdisk0
done
# reducevg -d -f rootvg hdisk0
# chpv -c hdisk0
# mklv -y vgBackup hdisk0 # consider adding -t and/or -s arguments to manage PP size)
# echo "restore saved data from above"

Hope this helps!

MichaelFelt

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vgcfgrestore

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

NAME

       vgcfgrestore - restore volume group descriptor area

SYNOPSIS

       vgcfgrestore [-d|--debug] [-f|--file filename] [-l[l]|--list] [-h|--help] [-M|--Metadatatype1|2] [-t|--test] [-v|--verbose] VolumeGroupName

DESCRIPTION

       vgcfgrestore  allows  you  to  restore  the metadata of VolumeGroupName from a text backup file produced by vgcfgbackup.  You can specify a
       backup file with --file.  If no backup file is specified, the most recent one is used.  Use --list for a list of the available  backup  and
       archive files of VolumeGroupName.

OPTIONS

       -l | --list -- List files pertaining to VolumeGroupName
	      List  metadata  backup  and  archive  files  pertaining  to VolumeGroupName.  May be used with the -f option.  Does not restore Vol-
	      umeGroupName.

       -f | --file filename -- Name of LVM metadata backup file
	      Specifies a metadata backup or archive file to be used for restoring VolumeGroupName.  Often this file has been created with  vgcfg-
	      backup.

       See lvm for common options.

REPLACING PHYSICAL VOLUMES

       vgdisplay  --partial  --verbose will show you the UUIDs and sizes of any PVs that are no longer present.  If a PV in the VG is lost and you
       wish to substitute another of the same size, use pvcreate --restorefile filename --uuid uuid (plus additional arguments as appropriate)	to
       initialise  it with the same UUID as the missing PV.  Repeat for all other missing PVs in the VG.  Then use vgcfgrestore --file filename to
       restore the volume group's metadata.

SEE ALSO

       lvm(8), vgcreate(8)

Sistina Software UK					 LVM TOOLS 2.02.44-cvs (02-17-09)					   VGCFGRESTORE(8)