[need your help] How to Fix unclean PG

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Hello there, 

I have a ceph cluster which increase from 400TB to 900 TB recently, now the cluster is in unhealthy status,  there're about 1700+ pg in unclean status

# ceph pg dump_stuck unclean|wc
ok
   1696   10176  191648

the cephfs can't work anymore,  the read io was no more than MB/s.
Is there any way to fix the unclean pg quickly?




--
Regards
Frank Yu
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