Quoting renjianxinlover (renjianxinlo...@163.com):
> 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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