I've been curious about this too as we are in the same boat with Gentoo.
On Thu, Apr 23, 2015 at 5:32 AM, Jean-Francois Maeyhieux b...@free.fr
wrote:
We are using a ganeti cluster in production environment using a
classical KVM/LVM/DRBD stack using dedicated 10gbs nics for drbd
synchonization.
Everything works fine and currently host system specs are:
- Gentoo Linux
- Kernel 3.14.x
- DRBD: version: 8.4.3 (api:1/proto:86-101)
- Userspace drbd tools: sys-cluster/drbd-8.4.3
Since there is not yet drbd userspace tools 8.4.3 available in Gentoo
portage, we wonder if it could be possible to use:
- a more recent kernel (3.18.x) that will bring an in kernel DRBD 8.4.5
- with the same userspace drbd tools 8.4.3 version
On a test host with a recent 3.19.x kernel, /proc/drbd exposed the same
API:
version: 8.4.5 (api:1/proto:86-101)
So I think kernel upgrade is possible. Is DRBD API the only important
version to check for drbd kernel/userspace part compatibility ?
We plan to do an upgrade using this path:
- evacuate VM from node to upgrade
- remove note to upgrade from cluster (so stop DRBD sync on secondary
devices)
- update kernel on node to upgrade with new DRBD 8.4.5
- re-add the upgraded node in the cluster and so let drbd synchonize:
- from primary devices on 8.4.3 kernel host
- to secondary devices on 8.4.5 kernel host
Is this path correct ?
Any advices about such an upgrade ?
Thanks
--
Jean-Francois Maeyhieux [Zentoo]
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Adam Randall
http://www.xaren.net
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