Hello all.
I have a Ceph cluster using XFS on the OSDs. Btrfs is not available to
me at the moment (cluster is running CentOS 6.4 with stock kernel).
I intend to maintain a full replica of an active ZFS dataset on the
Ceph infrastructure by installing an OpenSolaris KVM guest using
rbd-fuse to
The trouble with using ZFS copies on top of RBD is that both copies of
any particular block might end up on the same OSD. If you have
disabled replication in Ceph, then this would mean a single OSD
failure could cause data loss. For that reason, it seems it would be
better to do the replication
Thanks for the input John.
So I should leave ZFS checksumming on, disable ZFS replicas and rely
on Ceph RBD replicas.
Is it even sane to use rbd-fuse for this?
On a related note, is there any discard/trim support in rbd-fuse? Else
I won't ever be able to thin-out the RBD image once it is
On a related note, is there any discard/trim support in rbd-fuse?
Apparently so (but not in the kernel module unfortunately).
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On Fri, Nov 29, 2013 at 12:13 PM, Charles 'Boyo charlesb...@gmail.com wrote:
That's because qemu-kvm
in CentOS 6.4 doesn't support librbd.
RedHat just added RBD support in qemu-kvm-rhev in RHEV 6.5. I don't
know if that will trickle down to CentOS but you can probably
recompile it yourself like
On a related note, is there any discard/trim support in rbd-fuse?
Apparently so (but not in the kernel module unfortunately).
Ok, librbd (which is used by the qemu alternative) supports discard,
not the rbd kernel module does not. Neither of these are available to
me right now.
Is rbd-fuse
That's because qemu-kvm
in CentOS 6.4 doesn't support librbd.
RedHat just added RBD support in qemu-kvm-rhev in RHEV 6.5. I don't
know if that will trickle down to CentOS but you can probably
recompile it yourself like we did.
https://rhn.redhat.com/errata/RHSA-2013-1754.html
