Hello,
I run a a hyperconverged pve cluster (V7.2) with 11 nodes. Each node has
8 4TB disks. pve and ceph are installed an running.
I wanted to create some ceph-pools with each 512 pgs. Since I want to
use erasure coding (5+3) when creating a pool one rbd pool for metadata
and the data pool are created. I used pveceph pool this command:
pveceph pool create px-e --erasure-coding k=5,m=3 --pg_autoscale_mode
off --pg_num 512 --pg_num_min 128
I was able to create two pools in this way but the third pveceph call
threw this error:
"got unexpected control message: TASK ERROR: error with 'osd pool
create': mon_command failed - pg_num 512 size 8 would mean 22148 total
pgs, which exceeds max 22000 (mon_max_pg_per_osd 250 * num_in_osds 88)"
I also tried the direct way to create a new pool using:
ceph osd pool create <pool> 512 128 erasure <profile> but the error
message below remains.
What I do not understand now are the calculations behind the scenes for
the calculated total pg number of 22148. How is this total number
"22148" calculated?
I already reduced the number of pgs for the metadata pool of each
ec-pool and so I was able to create 4 pools in this way. But just for
fun I now tried to create ec-pool number 5 and I see the message from
above again.
Here are the pools created by now (scraped from ceph osd pool
autoscale-status):
Pool: Size: Bias: PG_NUM:
rbd 4599 1.0 32
px-a-data 528.2G 1.0 512
px-a-metadata 838.1k 1.0 128
px-b-data 0 1.0 512
px-b-metadata 19 1.0 128
px-c-data 0 1.0 512
px-c-metadata 19 1.0 128
px-d-data 0 1.0 512
px-d-metadata 0 1.0 128
So the total number of pgs for all pools is currently 2592 which is far
from 22148 pgs?
Any ideas?
Thanks Rainer
--
Rainer Krienke, Uni Koblenz, Rechenzentrum, A22, Universitaetsstrasse 1
56070 Koblenz, Web: http://www.uni-koblenz.de/~krienke, Tel: +49261287 1312
PGP: http://www.uni-koblenz.de/~krienke/mypgp.html, Fax: +49261287
1001312
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