Pool Latency

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Hi,

I'm facing something strange in ceph (v12.2.13, filestore). I have two
clusters with the same config (kernel, network, disks, ...). One of them
has 3ms latency the other has 100ms latency. Both physical disk latency on
write is less than 1ms.
In the cluster with 100ms latency on write when I create another pool with
the same configs (crush rule, replica, ...) and test the latency, it would
like my another cluster. So it seems there is a problem in one of my pools!
The pool has 8212 PGs and each PG is around 12GB with 844 objects. Also, I
have many removed_snaps in this pool and I don't know if it impacts
performance or not?

Do you have any idea what is wrong with my pool? Is there any way to debug
this problem?

Thanks.
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