On 03/05/2006, at 9:31 pm, Levy, Alan wrote:

Isn't the LVM information stored in the root filesystem ?

There is configuration data kept in /etc/lvm/, managed by LVM.  Part
of what the vgexport does is to remove that configuration data for
the VG being exported, so that the system knows not to expect that VG
to be present in the future.  vgimport does the opposite when the VG
is made accessible on the new system.

If you DDR the volumes, when vgscan is run on the new system it
should just say "oh, well, a bunch of new LVM stuff, I'll use it".

Mark is right, most of the really critical data about LVM is kept in
the metadata on the PVs.  Using vgexport/vgimport is just, well,
nicer IMHO :).  Probably not a big issue in your situation, where
you're throwing away the old server, but for moving VGs between
"persistent" systems it's pretty much essential.

Cheers,
Vic Cross

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