why my cluster become unavailable

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Hi, cepher

I have a cluster of 6 OSD server, every server has 8 OSDs.

I out 4 OSDs on every server, then my client io is blocking.

I reboot my client and then create a new rbd device, but the new
device also can't write io.

Yeah, i understand that some data may lost as threee replicas of some
object were lost, but why the cluster become unavailable?

There 80 incomplete pg and 4 down+incomplete pg.

Any solution i could solve the problem?

Thanks!
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