Rebalancing cluster and client access

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Hi everybody!

We have cluster with 12 storage nodes and replication 2.
When one node was destroyed our clients can not access to ceph cluster.
I read that with two copies in replication pool, ceph interrupt write operation during degraded state.

But it is not clear why clients can not read when the cluster is rebalancing?
Can clients write access to cluster (in degraded state) if will be 3 replicas?

With best regards, Serg Osherov.
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