On 12/9/21 09:30, Md. Hejbul Tawhid MUNNA wrote:
Hi,
Yes, min_size=1 and size=2 for ssd
for hdd it is min_size=1 and size=3
Could you please advice, about using hdd and ssd in a same ceph cluster.
Is it okay for production grade openstack?
Sure. But you want min_size=2 and size=3 for both pools, really. Search
for discussions about that on the ceph user mailing list (and why you
would want that for production).
We have created a new replicated rule for ssd, different pool for ssd
and new disk marking ssd class.
not idea about ceph-balancer
That probably needs fixing;-). I would start with reading this:
https://docs.ceph.com/en/latest/rados/operations/balancer/
Check if you have it enabled. If not test what "ceph balancer eval"
would advise. Enable it and see how it would impove things. Ideally you
would want to use mode upmap (moving PGs intead of reweighting OSDs).
In this state the balancer might not want to make any adjustments and
you might need to change the osd_full_ratio and osd_backfillfull_ratio.
But the tools I listed in my previous email might even work without
that. You don't want to put your cluster over the edge (you are already
close to the edge).
The amount of PGs per OSD seem *really* high. The Ceph Storage Cluster
has a default maximum value of 300 placement groups per OSD. Have you
tuned mon_max_pg_per_osd?
Gr. Stefan
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