[dm-devel] interpreting the output from dmsetup tables?

[Gary Funck]

dmsetup table says the following:

$ dmsetup table
VolGroup00-LogVol01: 0 3145728 linear 3:2 152830336
VolGroup00-LogVol00: 0 152829952 linear 3:2 384

where device [3:2] is /dev/hda2 (the root partition)

$ ls -l /dev/hda2
brw-rw----  1 root disk 3, 2 Jul 25 22:48 /dev/hda2


And fdisk says:

$ fdisk -u -l /dev/hda
 
Disk /dev/hda: 80.0 GB, 80026361856 bytes
255 heads, 63 sectors/track, 9729 cylinders, total 156301488 sectors
Units = sectors of 1 * 512 = 512 bytes
 
   Device Boot      Start         End      Blocks   Id  System
/dev/hda1   *          63      208844      104391   83  Linux
/dev/hda2          208845   156296384    78043770   8e  Linux LVM

We've mounted VolGroup00-LogVol00 on '/', and its dmsetup table
makes some sense, in that there are 156087540 sectors in /dev/hda2,
which is large enough to hold both VolGroup00-LogVol00
and VolGroup00-LogVol01, but I'm wondering where VolGroup00-LogVol01
might've crept in during the install? It has 3145728 sectors,
and starts after VolGroup00-LogVol00 ends, but it isn't mounted
and otherwise seems unecessary.  Is this typical of a default
FC4 install, specifing that '/' be a managed volume, did we somehow
hit the wrong buttons?