07-17-2007
LVM magic number 0x4D48
LVM partition(8e type) begins with a magic number(0x4D48) - HM,
At this sector, I get the name of volume group plus two three more structures, which I am unable to decipher. So, if anyone can let me know the details of these structures.
In my case, I had made two logical volumes in my LVM volume group. I want to know if I can get the start of these logical volumes from the sector where LVM begins. Suppose my LVM begins at sector 208845, then by adding 88 to it, I get 208933. At sector no. 208933, I get the information of both the logical volumes but not able to get the start of my logical volumes from this sector(i.e. sector no. 208933). Manually tracing it through WinHex, I can get the start of both the logical volumes but this information must be
present at sector no. 208845(from where LVM begins which I get it from MBR) and at sector no. 208933 (208845 plus 88 = 208933).
Now, if I extend first logical volume by some GBs within that volume group, then it keeps the extended copy after the second logical volume, but I am unable to make the connectivity between the extended and the
prior one.
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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)