Alasdair G Kergon wrote:
On Wed, Sep 06, 2006 at 11:14:13AM +0200, Jens Wilke wrote:
What is the reason for this?
No code to do this has yet been written.
There should be no fundamental problems with doing it.
pvmove is a wrong approach to the problem too, imo. PVs are just storage devices
for a VG. By moving LVs (or the PEs that the LV resides on), you accomplish the
same. When there are no PE in use on a PV, it is easy enough to reduce the VG to
remove the PV.
Like in this scenario when you want to move a VG from an internal disk to, let's
say SAN volume (with pseudo-commands):
Assuming VG is pn /dev/scsi and new disk is /dev/sandisk.
# extendvg myvg /dev/sandisk
# lvmirror myvg copies=1 strict=1
(one mirror, allocate strict so copies are on different PVs)
Now check that LVs are in sync and that all is OK with the new disk...
# lvmirror myvg copies=0 remove=/dev/scsi
# reducevg myvg /dev/scsi
This strategy would assume that mirroring is done in PE/LE mapping levels.
I have no idea if Linux LVM mirroring supports this. If anyone have links to
good LVM docs for the mirroring features that will come with LVM in RHEL5 I
would appreciate it.
--
//Morten Torstensen
//Email: morten@mortent.org
//IM: Cartoon@jabber.no morten.torstensen@gmail.com
And if it turns out that there is a God, I don't believe that he is evil.
The worst that can be said is that he's an underachiever.
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