Sorry what i said was fuzzy before.
Currently, my mds is running with certain osds at same node in which SSD drive serves as cache device.
On 12/28/2019 15:49，Stefan Kooman<stefan@xxxxxx> wrote：
Quoting renjianxinlover (renjianxinlover@xxxxxxx):
HI, Nathan, thanks for your quick reply!
comand 'ceph status' outputs warning including about ten clients failing to respond to cache pressure;
in addition, in mds node, 'iostat -x 1' shows drive io usage of mds within five seconds as follow,
You should run this iostat -x 1 on the OSD nodes ... MDS is not doing
any IO in and of itself as far as Ceph is concerned.
Gr. Stefan
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