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Top Forums UNIX for Dummies Questions & Answers help needed regarding Journaling File system Post 70036 by Perderabo on Monday 25th of April 2005 11:37:33 AM
Old 04-25-2005
ext3 is layered on ext2. You can even convert a mounted ext2 filesystem to ext3. So all of the ext2 documentation is relevant. There is a book UNIX Filesystems by Steve Pate that has some info about both ext2 and ext3. Here is Tweedie's original paper in PDF format. And here are some comments about the code.

I am not aware of any snapshot capability with ext3 that would facilitate backups.
 

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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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