Hi all,
I have a test ceph cluster with 4 osd servers containing each 3 osds.
The crushmap uses 2 rooms with 2 servers in each room.
We use replica 3 for pools.
I have the following custom crushrule to ensure that I have at least one
copy of each data in each room.
rule replicated3over2rooms {
id 1
type replicated
min_size 3
max_size 4
step take default
step choose firstn 0 type room
step chooseleaf firstn 2 type host
step emit
}
Everything was working well in nautilus/centos7 (I could create pools
using the dashboard and my custom rule).
I upgraded to pacific/ubuntu 20.04 in containers with cephadm.
Now, I cannot create a new pool with replicated3over2rooms using the
dashboard !
If I choose Pool type = replicated, Replicated size = 3, Crush ruleset =
replicated3over2rooms
The dashboard says :
Minimum: 3
Maximum: 2
The size specified is out of range. A value from 3 to 2 is usable.
And inspecting replicatedover2rooms ruleset in the dashboard says that
the parameters are
max_size 4
min_size 3
rule_id 1
usable_size 2
Where that usable_size comes from ? How to correct it ?
If i run the command line
ceph osd pool create test 16 replicated replicated3over2rooms 3
it works !!
Thanks.
F.
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