Slow read write operation in ssd disk pool

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Dear Team,

We have two type to disk in our ceph cluster one is Magnetic disk, another
type is SSD.

# ceph osd crush class ls
[
    "hdd",
    "ssd"
]

hdd is normally a bit slower, which is normal. initially ssd was faster
read/write. Recently we are facing very slow operation on ssd. Need help to
troubleshoot the issue

we are using CEPH in our openstack cinder backend

Regards,
Munna
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