Hi Danti,
The behavior you are experiencing is normal. As I pointed out previously,
I've been using this setup for many years and I've seen the same thing. You
will encounter that when the filesystem is written on the DRBD device without
the use of a partition table.
As a side note, I've had some nasty stability issues with the DRBD version
in the kernel (4.4/4.9 kernels) when running on ZFS, but DRBD 8.4.10 and ZFS
0.6.5.11 seem to be running great. I also run the storage as part of dom0,
which many admins don't recommend, but generally it works alright. The
stability issues were typically rare and happened under high I/O loads and were
DRBD related deadlock type crashes. Again, those problems seem to be resolve
in the latest DRBD 8 RELEASE.
David
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Jacksonville Port Authority
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On Wed, Sep 06, 2017 at 03:56:35PM +0200, Gionatan Danti wrote:
> On 06/09/2017 15:31, Yannis Milios wrote:
> > If your topology is like the following: HDD -> ZFS (ZVOL) -> DRBD ->
> > XFS then I believe it should make sense to always mount at the DRBD
> > level and not at the ZVOL level which happens to be the underlying
> > blockdev for DRBD.
> Sure! Directly mounting the DRBD-backing ZVOL would, at the bare
> minumum, ruin the replication with the peer.
>
> I was speaking about mounting ZVOLs *snapshots* to access previous data
> version.
>
> Regards.
>
> --
> Danti Gionatan
> Supporto Tecnico
> Assyoma S.r.l. - www.assyoma.it
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