Reducing / on rootvg Post: 303018379

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Operating Systems AIX Reducing / on rootvg Post 303018379 by rbatte1 on Tuesday 5th of June 2018 07:03:33 AM

06-05-2018

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Not a straightforward fix, I'm afraid. I don't think you can reduce the filesystem in a simple way. If it is in-use, then there is pretty much no chance.

I've done this on Linux and it's messy. I ended up having to boot from media and forcing it from there, but I can't remember if AIX let's you do that anyway. If I was to be faced with this on AIX, then I would have two options but both of them are effectively Disaster Recovery options:-

Use mkszfile and then edit the control file it generates before running a mksysb. You can then restore from the backup using the changed filesystem size
Use the product Storix – Linux, AIX and Solaris Backup and System Recovery Software to backup and then restore. During the restore you can adjust the disk sizes.

An alternate to the first one might be to use savevg & restvg whilst adjusting the LV description file, but it's essentially the same.

They are pretty serious and obviously requires a chunk of down-time (as does the way I did with Linux) however you might be able to use one of these methods to clone your server to alternate hardware (or LPAR) and attach the application/data disks to it.

I'm sorry, but it's not a nice place to be.

When you say that you want to migrate hd10opt, may I ask why? I would hope that this is mirrored, or has someone managed to remove the mirrors to give themselves lots of free space to grow in to? Are these real, local disks? If they are virtualised by something, does that protect you against hardware failure? It might be, but that can be done wrong too.

Can you share the output from:-

Code:

lsvg -p rootvg
lsvg -l rootvg
lspv -l hdisk0    (and hdisk1)
lscfg -vl hdisk0

Thanks, in advance,
Robin

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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 2.02.95(2) (2012-03-06)					   VGCFGRESTORE(8)

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