It depends on the cluster. In general I would say if your PG count is already good in terms of PG-per-OSD (say between 100 and 200 each) add capacity and then re-evaluate your PG count after. If you have a lot of time before the gear will be racked and could undergo some PG splits before the new gear is integrated you may want to get that work done now. Respectfully, *Wes Dillingham* LinkedIn <http://www.linkedin.com/in/wesleydillingham> wes@wesdillingham.com On Tue, Jun 4, 2024 at 4:27 PM Erich Weiler <weiler@soe.ucsc.edu> wrote:
Hi All,
I'm going to be adding a bunch of OSDs to our cephfs cluster shortly (increasing the total size by 50%). We're on reef, and will be deploying using the cephadm method, and the OSDs are exactly the same size and disk type as the current ones.
So, after adding the new OSDs, my understanding is that ceph will begin rebalancing the data. I will also probably want to increase my PGs to accommodate the new OSDs being added. My question is basically: should I wait for the rebalance to finish before increasing my PG count? Which would kick off another relabance action for the new PGs? Or, should I increase the PG count as soon as the rebalance action starts after adding the new OSDs, and it would then create new PGs and rebalance on the new OSDs at the same time?
Thanks for any guidance!
-erich _______________________________________________ ceph-users mailing list -- ceph-users@ceph.io To unsubscribe send an email to ceph-users-leave@ceph.io