On 17 Oct 2016 6:11 pm, "Gandalf Corvotempesta" <
gandalf.corvotempe...@gmail.com> wrote:
>
> Il 17 ott 2016 09:01, "Jan Schermer" <j...@schermer.cz> ha scritto:
> >
> > 3 storages, many more hypervisors, data triplicated... that's the usual
scenario
>
> Are you using drbd9 with a 3 nodes replication?
> could you please share the drbd config?
>
> > We use ZFS on the storages, ZVOLs on top of that, each ZVOL makes up
part of the DRBD resource that gets exported to the hypervisor.
>
> No raid volumes?
> are you creating a single drbd resource for each storage disk?  (In
example, in a server with 12 disks are you creating 12 drbd resources?)
>
> i would like to create a raidz2 on each node but the resulting volume is
not seen as block device thus can't be used as drbd resource
>
And thats why you create zvol then and use it as backing device for the
drbd device. How many zvols/drbds you create depends on the raidz2 size and
your needs. Each zvol backed drbd is then given to the hypervisor to be
used as vm volume.

> I can create a raid6 with mdadm, use that volume for drbd and put zfs on
top of it but there are too many moving parts stacked together,  that would
be a perfect reciepe for a huge mess
>
>
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