icated pool has replication factor R=k.
=
Frank Schilder
AIT Risø Campus
Bygning 109, rum S14
From: Frank Schilder
Sent: 18 November 2020 09:25:46
To: Szabo, Istvan (Agoda); ceph-users@ceph.io
Subject: [ceph-users] Re: Ceph EC PG calculatio
Its the same formula. An k-times replicated pool has replication factor R. With
the formula I stated below, you can compute the entire PG budget depending on
what your PG target per OSD is. I'm afraid you will have to do that yourself.
Best regards,
=
Frank Schilder
AIT Risø
Hi,
Thank you Frank.
And after how this affect the non EC pools? Because they will use the same
device classes, which is SSD.
So I'd calculate with 100PG/osd, because this will grow.
If I calculate with EC it will be 512. But still have many replicated pools
Or just let the autoscaler in
Roughly speaking, if you have N OSDs, a replication factor of R and aim for P
PGs/OSD on average, you can assign (N*P)/R PGs to the pool.
Example: 4+2 EC has replication 6. There are 36 OSDs. If you want to place,
say, 50 PGs per OSD, you can assign
(36*50)/6=300 PGs
to the EC pool. You may
Den ons 18 nov. 2020 kl 04:59 skrev Szabo, Istvan (Agoda) <
istvan.sz...@agoda.com>:
> I have this error:
> I have 36 osd and get this:
> Error ERANGE: pg_num 4096 size 6 would mean 25011 total pgs, which
> exceeds max 10500 (mon_max_pg_per_osd 250 * num_in_osds 42)
> I have 4:2 data EC pool,
