[linux-lvm] pvmove: moving a mirror logical volume not supported?
morten at mortent.org
Thu Sep 7 10:47:38 UTC 2006
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.
//Email: morten at mortent.org
//IM: Cartoon at jabber.no morten.torstensen at 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.
More information about the linux-lvm