Yes, the recommendation is taking into account the number of replicas. If you have size=3, then multiply that pool's PG count by 3. If you have EC M=4 K=2, then multiply that pool's PGs by 6. You want to take into account all copies of a PG for the 100-200 PG/osd count.
On Wed, Jan 31, 2018, 1:44 PM Martin Preuss <martin@xxxxxxxxxxxxx> wrote:
Hi,
I guess this is an extremely silly question but...
I often read that the ideal PG/OSD ratio should be 100-200 PGs per OSD.
How is this calculated?
When I do "ceph -s" it correctly says I have 320 PGs in 5 pools.
However, this doesn't account for the replicas, does it?
I mean I have the following table which shows how many PGs of which pool
are stored on which osd.
pool : 1 2 3 4 5 | SUM
--------------------------------------------------------
osd.0 7 5 7 11 24 | 54
osd.1 16 18 15 37 26 | 112
osd.2 9 9 10 16 30 | 74
osd.3 6 12 9 11 23 | 61
osd.4 8 10 9 16 29 | 72
osd.5 10 14 9 17 17 | 67
osd.6 7 17 10 27 27 | 88
osd.7 11 17 11 22 38 | 99
osd.8 14 14 11 15 23 | 77
osd.9 8 12 5 20 19 | 64
--------------------------------------------------------
SUM : 96 128 96 192 256 |
If I sum up all last columns I am clearly above 320... So 100/OSD or
200/OSD: Does it mean *AFTER* taking into account all replicas?
Regards
Martin
--
"Things are only impossible until they're not"
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