[Openstack] Howto Nova setup with HA?
Florian Haas
florian at hastexo.com
Fri Feb 17 12:13:30 UTC 2012
On Thu, Feb 16, 2012 at 3:09 PM, Tom Ellis <tom.ellis at canonical.com> wrote:
> nova-volume service
> * Current weakness in the HA setup, unless you are willing to use iscsi
> tgtd with DRBD. I believe this would still have some problems when
> failing over with the initiators that are logged in.
Nope, this is well understood and supported. It all amounts to getting
the Pacemaker configuration right, but DRBD-backed, tgt-based iSCSI
targets are perfectly capable of failover that is fully transparent to
initiators.
That being said, of course nova-volume with RBD (RADOS block device)
would be another approach that may provide better reliability (more
replicas, where DRBD is limited to 2 -- 4 with some trickery), better
scaleout (seamless expansion and contraction of the storage space),
and better self-healing capabilities (automatic rebalancing if
individual replicas fail).
Hope this is useful.
Cheers,
Florian
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