I read about the "warm" option and we are already discussing this. I don't know if the pgs needs a tuning. I don't know what the impact is and if there will be any difference if we enable it. The, meanwhile gone, last ceph admin made a ticket, and I am not particularly familiar with ceph. So I need to work on this ticket and I try not to trash our ceph storage :-) Am Di., 16. Juni 2020 um 11:39 Uhr schrieb Dan van der Ster <dan@vanderster.com>:
Hi,
I agree with "someone" -- it's not a good idea to just naively enable pg_autoscaler on an existing cluster with lots of data and active customers.
If you're curious about this feature, it would be harmless to start out by enabling it with pg_autoscale_mode = warn on each pool. This way you can see what the autoscaler would do if it were set to *on*. Then you can tweak all the target_size_ratio or target_size_bytes accordingly.
BTW, do you have some feeling that your 17000 PGs are currently not correctly proportioned for your cluster?
-- Dan
On Tue, Jun 16, 2020 at 11:31 AM Boris Behrens <bb@kervyn.de> wrote:
Hi,
I would like to enable the pg_autoscaler on our nautilus cluster. Someone told me that I should be really really careful to NOT have customer impact.
Maybe someone can share some experience on this?
The Cluster got 455 OSDs on 19 hosts with ~17000 PGs and ~1petabyte raw storage where ~600TB raw is used. _______________________________________________ ceph-users mailing list -- ceph-users@ceph.io To unsubscribe send an email to ceph-users-leave@ceph.io
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