[DRBD-user] Geo-mirroring an active LVM volume with drbd

Maros Timko timkom at gmail.com
Sat Apr 11 20:17:04 CEST 2009

Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.

Hi Paul,

when you use "external metadata" option for DRBD resource (
you do not need to modify backed LVM at all.

With regards,

2009/4/10 Paul <drbd at comm.it>

> Hi all,
> I've been away from drbd for some time now (last I was using version
> 6), but how I have a project that could be usefull to many people (I
> hope).
> I'm trying to use drbd to create a mirror of a running LVM volume to a
> remote site over a wan connection.
> The LVM volume holds the image of a windows system running in a xen
> hvm host. My aim is to move this virtual machine accross data centers
> with no downtime. Just move it while running and then shut it down in
> the old center and power it on in the new center.
> To accomplish this I need to enslave the lvm holding the machine to
> drbd and then replicate it to the new datacenter. However, there are a
> number of problems that I envision along the way.
> If I "enslave" a physical lvm volume to drbd, will it overwrite any
> region of the underlying lvm (possibly destroying the host partition
> table there) ?
> Is there a way to use an external "map" so to preserve the original
> lvm volume?
> if the original lvm volume cannot be preserved, should I just create a
> new physical volume to the VG with another drbd device and then just
> pvmove the extents from the old PV to the new drbd PV which will then
> simply replicate to the new datacenter? and then do the reverse
> offloading the drbd PV to a local PV in a local san storage?
> Any other ideas whould be really appreciated... as I have to move
> several hundred GB and they will take some days to replicate via WAN.
> Cheers,
> Paul.
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> drbd-user at lists.linbit.com
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