Re: RBD mirroring replicated and erasure coded pools

[Jason Dillaman <jdillama@xxxxxxxxxx>]

On Tue, Jul 31, 2018 at 11:10 AM Ilja Slepnev <islepnev@xxxxxxxxx> wrote:

Hi,

is it possible to establish RBD mirroring between replicated and erasure coded pools?

I'm trying to setup replication as described on http://docs.ceph.com/docs/master/rbd/rbd-mirroring/ without success.

Ceph 12.2.5 Luminous

root@local:~# rbd --cluster local mirror pool enable rbd-2 pool

2018-07-31 17:35:57.350506 7fa0833af0c0 -1 librbd::api::Mirror: mode_set: failed to allocate mirroring uuid: (95) Operation not supported

No problem with replicated pool:

root@local:~# rbd --cluster local mirror pool enable rbd pool

root@local:~# 

Pool configuration:

root@local:~# ceph --cluster local osd pool ls detail

pool 13 'rbd' replicated size 3 min_size 2 crush_rule 0 object_hash rjenkins pg_num 256 pgp_num 256 last_change 2219 flags hashpspool stripe_width 0 compression_mode none application rbd

pool 15 'rbd-2' erasure size 6 min_size 5 crush_rule 4 object_hash rjenkins pg_num 64 pgp_num 64 last_change 2220 flags hashpspool,ec_overwrites stripe_width 16384 application rbd

BR,

--
Ilja Slepnev

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RBD requires that its base-pool is a replicated pool, but you can place the RBD image data objects in an erasure-coded pool. For rbd-mirror daemon to do this by default, you can set the "rbd default data pool = XYZ" configuration option in your ceph.conf on your rbd-mirror daemon host.

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Jason

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