AIX's restorevgfiles Post: 303002003

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Operating Systems AIX AIX's restorevgfiles Post 303002003 by MichaelFelt on Wednesday 16th of August 2017 03:21:00 AM

08-16-2017

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Quote:

Originally Posted by kwliew999

Seek help from all experts,
I understand that if I perform a savevg on a VG, and later perform a restvg to another hdisk, I will get back a exact same VG that I perform savevg earlier. It will be identical even on permission bit, owner and group.
However, if I perform a restorevgfiles for a filesystem from the same savevg file, will I get a identical filesystem? In terms of permission and owner and group will be identical as well?

As bakunin mentions the commands mksysb and savevg are scripts that act as "front-ends" and are able to collect and record information needed to recreate an "identical" copy during restore.

a) it is not advisable to restvga volume group that you have saved, but not removed. While it may be possible to provide an argument to give the volume group a new name, by default restvg wants to re-create the same logical volume names. As the original volume group exists - this is not acceptable and AIX will rename to logical volumes and your "restore" is no longer identical at the volume group level.

b) as to restore files from a "bff" (backup file format) file - these files will have identical information in the inodes - again, at a binary level - not necessarily at a user level. If UID and GID (i.e., /etc/password and /etc/group) are identical on "both" servers, the restore will appear identical, if the USER/GROUP information is not identical - the restored files will not appear as identical. At a binary level - they are identical.

In short, when you need identical information at an INODE level (i.e, OS specific knowledge about special files and/or ACL, permission bits (e.g., tcb-bit) use the commands backup and restore for saving files, not applications such as ftp, scp, cpio, tar, rsync as they do not copy inode data at an OS level. They might work for an AIX to AIX copy, but there is no guarantee.

p.s. - if you goal is to copy a filesystem, e.g., through a pipe - feel free to look at a script I used (I generally just type Smilie

Code:

# find . | backup -if - | (cd /some/where/new; restore -xqf -)

Look at: http://www.rootvg.net/content/view/301/309/ (from 2009!)

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