07-18-2007
LVM structures when read through WinHex
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).
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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PVCK(8) System Manager's Manual PVCK(8)
NAME
pvck - check physical volume metadata
SYNOPSIS
pvck [-d|--debug] [-h|--help] [-v|--verbose] [--labelsector] PhysicalVolume [PhysicalVolume...]
DESCRIPTION
pvck checks physical volume LVM metadata for consistency.
OPTIONS
See lvm for common options.
--labelsector sector
By default, 4 sectors of PhysicalVolume are scanned for an LVM label, starting at sector 0. This parameter allows you to specify a
different starting sector for the scan and is useful for recovery situations. For example, suppose the partition table is corrupted
or lost on /dev/sda, but you suspect there was an LVM partition at approximately 100 MB. This area of the disk may be scanned by
using the --labelsector parameter with a value of 204800 (100 * 1024 * 1024 / 512 = 204800):
pvck --labelsector 204800 /dev/sda
Note that a script can be used with --labelsector to automate the process of finding LVM labels.
SEE ALSO
lvm(8), pvcreate(8), pvscan(8) vgck(8)
Sistina Software UK LVM TOOLS 2.02.95(2) (2012-03-06) PVCK(8)