Hi,
apparently this config option has been removed between N and O
releases. I found this revision [1] from 2019 and the pull request [2]
in favor of adjusting the journal fetch based on memory target. I
didn't read the whole conversation but to me it looks like the docs
are outdated and I'd recommend to create a tracker issue for that. I
also don't have an answer how to tune the journal fetch performance,
hopefully someone can chime in here. But if it's based on the
rbd_mirror memory target I'd try to play with some of these values
(maybe in a test environment first):
rbd_mirror_memory_target
rbd_mirror_memory_cache_min
If you have the resources, maybe increase the memory_target and see if
the speed increases.
Regards,
Eugen
[1]
https://tracker.ceph.com/projects/ceph/repository/revisions/1ef12ea0d29f95545dc0350143e4a94b115d5e5f
[2] https://github.com/ceph/ceph/pull/27670
Zitat von ankit raikwar <ankit199999raikwar@xxxxxxxxx>:
Hello All,
In the ceph quincy Not able to find
rbd_mirror_journal_max_fetch_bytes config
in rbd mirror
i configured the ceph cluster almost 400 tb and enable
the rbd-mirror in the
starting stage i'm able to achive the almost 9 GB speed , but after
the rebalane
completed of the all the images . rbd-mirror speed got automaticily
reduce to between 4 to
5 mbps.
in my primary cluster we are continuelsy writing the 50 to 400
mbps data but replication
speed only we get the 4 to 5 mbps. also we have the 10 Gbps
replication network
bandwidth.
Note::- I also try to find the option
rbd_mirror_journal_max_fetch_bytes but i'm not
able to find the this option in the configuration. also when i try
to set from the command
line it's showing error like
command:
ceph config set client.rbd rbd_mirror_journal_max_fetch_bytes 33554432
error:
Error EINVAL: unrecognized config option 'rbd_mirror_journal_max_fetch_bytes'
cluster version
ceph version 17.2.5 (98318ae89f1a893a6ded3a640405cdbb33e08757)
quincy (stable)
Please suggest any alternative way to configurre this option or how
i can improve the
replication n/w speed.
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