I have used the gentle reweight script many times in the past. But more recently, I expanded one cluster from 334 to 1114 OSDs, by just changing the crush weight 100 OSDs at a time. Once all pgs from those 100 were stable and backfilling, add another hundred. I stopped at 500 and let the backfill finish. I repeated the process for the last 500 drives and it was finished in a weekend without any complaints.
Don't forget to adjust your PG count for the new OSDs once rebalancing is done.
-Brett
On Sun, Jun 23, 2019, 2:51 PM <ceph@xxxxxxxxxx> wrote:
Hello,_______________________________________________
I would advice to use this Script from dan:
https://github.com/cernceph/ceph-scripts/blob/master/tools/ceph-gentle-reweight
I have Used it many Times and it works Great - also if you want to drain the OSDs.
Hth
MehmetAm 30. Mai 2019 22:59:05 MESZ schrieb Michel Raabe <rmichel@xxxxxxxxxxx>:Hi Mike,
On 30.05.19 02:00, Mike Cave wrote:I’d like a s little friction for the cluster as possible as it is in
heavy use right now.
I’m running mimic (13.2.5) on CentOS.
Any suggestions on best practices for this?
You can limit the recovery for example
* max backfills
* recovery max active
* recovery sleep
It will slow down the rebalance but will not hurt the users too much.
Michel.
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