Hi,
I have 2 running ceph squid clusters (19.2.2).
On each cluster there is an rbd pool named k8s-1 that I want to mirror
using the snapshot based mode.
if I configure both clusters in two way mirroring using the mode=image
everything works fine.
```
rbd mirror pool enable ${mypool} image
rbd mirror image enable ${mypool}/${myimage} snapshot
```
When I take a snapshot of myimage it gets mirrored.
if I configure both clusters in two way mirroring using the mode=pool
nothings happen.
The snapshot are never mirrored in the second cluster.
Reading the documentation https://docs.ceph.com/en/squid/rbd/rbd-mirroring/,
I think that the problem is that the default mode for this command is
"journal":
rbd mirror image enable {pool-name}/{image-name} {mode}
But, when enabling mirror on the pool there is no way to define
mode=journal/snapshot:
rbd mirror pool enable [--site-name {local-site-name}] {pool-name} {mode}
with mode=pool (default) or image.
Then I think when I do :
rbd mirror pool enable ${mypool} image
I think it implicitly do :
rbd mirror pool enable ${mypool} image journal # THIS COMMAND DOES NOT
WORK.
But I would need to have:
rbd mirror pool enable ${mypool} image snapshot # THIS COMMAND DOES NOT
WORK.
In addition, when I am configured on mirror mode = pool, if I try to
disable mirroring on an image I get the following error :
rbd mirror image disable ${mypool}/${myimage}
2025-06-18T15:37:42.177+0000 7f24ec53ce00 -1 librbd::api::Mirror:
image_disable: cannot disable mirroring in the current pool mirroring mode
Also error when I am configured on mirror mode = pool, if I try to enable
snapshot mirroring on an image :
rbd mirror image enable ${mypool}/${myimage} snapshot
2025-06-18T15:39:44.507+0000 7f533df1fe00 -1 librbd::api::Mirror:
image_enable: cannot enable mirroring: pool is not in image mirror mode
Could someone please confirm, that this is not supported ?
What is the best workaround ? Cron cephadm shell script to enable mirror on
all images ?
PS : I do not want to use the journal based mode since the ceph-csi mounter
nbd is not prod-ready.
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