Hi samuel,
I haven't used dedicated rbd journal pools so I don't have any comment
on that. But there's an alternative to journal-based mirroring, you
can also mirror based on snapshot [1]. Would this be an alternative
for you to look deeper into?
Regards,
Eugen
[1] https://docs.ceph.com/en/latest/rbd/rbd-mirroring/
Zitat von huxiaoyu@xxxxxxxxxxxx:
Dear Cephers,
Enabling Ceph mirroring means double writes on the same data pool,
thus possibly degrading the write performance dramatically. By
google searching, i found the following words (apparently appeared
several year ago)
"The rbd CLI allows you to use the "--journal-pool" argument when
creating, copying, cloning, or importing and image with journaling
enabled. You can also specify the journal data pool when dynamically
enabling the journaling feature using the same argument. Finally,
there is a Ceph config setting of "rbd journal pool = XYZ" that
allows you to default new journals to a specific pool."
Does anyone really have experience of using a specific SSD/NVMe pool
to offload journaling workload from the data pool for RBD Mirroring
disaster recovery? what would the best practice for improving
performance of rbd mirroring (large amounts of data)?
best regards,
samuel
huxiaoyu@xxxxxxxxxxxx
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