On 12/15/21 14:18, Arthur Outhenin-Chalandre wrote:
On 12/15/21 13:50, Torkil Svensgaard wrote:
Ah, so as long as I don't run the mirror daemons on site-a there is no
risk of overwriting production data there?
To be perfectly clear there should be no risk whatsoever (as Ilya also
said). I suggested to not run rbd-mirror on site-a so that replication
from site-b to site-a wouldn't be a thing at all.
That being said we also run a setup where we only need one way
replication but for the same reasons posted by Ilya we use rx-tx and run
rbd-mirror in both sites.
Hi Arthur
Thanks for the clarification.
I set up one peer with rx-tx, and it seems to replicate as it should,
but the site-a status looks a little odd. Why down+unknown and status
not found? Because of rx-tx peer with only one way active?
site-a:
rbd mirror image status rbd_internal/store
athos: Thu Dec 16 07:51:26 2021
store:
global_id: 4888eab6-f6f4-4a11-9e91-e3446651f911
state: down+unknown
description: status not found
last_update:
peer_sites:
name: dcn-ceph
state: up+replaying
description: replaying,
{"bytes_per_second":272384136.53,"bytes_per_snapshot":0.0,"remote_snapshot_timestamp":16395851
29,"replay_state":"syncing","seconds_until_synced":0,"syncing_percent":12,"syncing_snapshot_timestamp":1639585129}
last_update: 2021-12-16 07:51:04
snapshots:
20
.mirror.primary.4888eab6-f6f4-4a11-9e91-e3446651f911.137a0eeb-c54d-4f0f-9cb1-3cdc87a891d4
(peer_uuids:[bf1978c0-423
1-43ca-831f-669bf4a898b2])
site-b:
rbd mirror image status rbd_internal/store
dcn-ceph-01: Thu Dec 16 06:53:46 2021
store:
global_id: 4888eab6-f6f4-4a11-9e91-e3446651f911
state: up+replaying
description: replaying,
{"bytes_per_second":252701491.2,"bytes_per_snapshot":0.0,"remote_snapshot_timestamp":1639585129,"replay_s
tate":"syncing","seconds_until_synced":0,"syncing_percent":13,"syncing_snapshot_timestamp":1639585129}
service: dcn-ceph-01.itashe on dcn-ceph-01
last_update: 2021-12-16 06:53:34
Here's one with rx only. That looks more peaceful:
site-a:
rbd mirror image status rbd/mail
athos: Thu Dec 16 07:58:10 2021
mail:
global_id: 2b3d355c-d095-45a4-8c29-80f059d78483
snapshots:
116
.mirror.primary.2b3d355c-d095-45a4-8c29-80f059d78483.82d2240a-319f-4990-84e8-98284864032c
(peer_uuids:[cabf78ce-f6
5f-4a27-a648-20b3fd326647])
site-b:
rbd mirror image status rbd/mail
dcn-ceph-01: Thu Dec 16 06:57:22 2021
mail:
global_id: 2b3d355c-d095-45a4-8c29-80f059d78483
state: up+replaying
description: replaying,
{"bytes_per_second":0.0,"bytes_per_snapshot":1140323336192.0,"local_snapshot_timestamp":1639573987,"remot
e_snapshot_timestamp":1639573987,"replay_state":"idle"}
service: dcn-ceph-01.itashe on dcn-ceph-01
last_update: 2021-12-16 06:57:07
Mvh.
Torkil
--
Torkil Svensgaard
Sysadmin
MR-Forskningssektionen, afs. 714
DRCMR, Danish Research Centre for Magnetic Resonance
Hvidovre Hospital
Kettegård Allé 30
DK-2650 Hvidovre
Denmark
Tel: +45 386 22828
E-mail: torkil@xxxxxxxx
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