PG stuck incomplete

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Hello,

on a Luminous cluster, I have a PG incomplete and I can't find how to
fix that.

It's an EC pool (4+2) :

    pg 37.9c is incomplete, acting [32,50,59,1,0,75] (reducing pool
bkp-sb-raid6 min_size from 4 may help; search ceph.com/docs for
'incomplete')

Of course, we can't reduce min_size from 4.

And the full state : https://pastebin.com/zrwu5X0w

So, IO are blocked, we can't access thoses damaged data.
OSD blocks too :
    osds 32,68,69 have stuck requests > 4194.3 sec

OSD 32 is the primary of this PG.
And OSD 68 and 69 are for cache tiering.

Any idea how can I fix that ?

Thanks,

Olivier


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