Move Ceph size from 2 to 3


Renowned Member
Dec 8, 2009
I have Cluster with 11 nodes, each node 2 disks of 2TB SSD
all disks are in Ceph pool with size = 2
now, I want to move to size = 3
there is any downtime / problem we should expect during this change?

Normally not, if you have configured your cluster and your crush map / rules correctly, there is no impact expected.

But you need to make sure you have enough space left.


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