Hello everyone,
A few weeks ago I have enabled the ceph balancer on my cluster as per the
instructions here: [ https://docs.ceph.com/docs/mimic/mgr/balancer/ |
https://docs.ceph.com/docs/mimic/mgr/balancer/ ]
I am running ceph version:
ceph version 13.2.6 (7b695f835b03642f85998b2ae7b6dd093d9fbce4) mimic (stable)
The cluster has 48 osds (40 osds in hdd pools and 8 osds in ssd pool)
Currently, the balancer status is showing as Active.
# ceph balancer status
{
"active": true,
"plans": [],
"mode": "upmap"
}
The health status of the cluster is:
health: HEALTH_OK
Previously, I've used the old REWEIGHT to change the placement of data as I've
seen very uneven usage (ranging from about 60% usage on some OSDs to over 90%
on others). So, I have a number of osds with reweight of 1 an some going down
to 0.75.
At the moment the osd usage ranges between about 65% to to just under 90%, so
still a huge variation. After switching on the balancer, I've not actually seen
any activity or data migration, so I am not sure if the balancer is working at
all. Could someone tell me how do I check if balancing is doing its job?
The second question is as the balancer is now switched on, do I suppose to set
the reweight values back to their default value of 1?
Many thanks
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