Type: Distributed-Replicate
Number of Bricks: 2 x 2 = 4
With that setup, you lose quorum if you lose any one node.
Brick 1 replicates to brick 2, and brick 3 replicates to brick 4. If any one of those goes down, quorum falls to <51%, which locks the brick under the default settings.
If you've only got 4 servers to play with, I suggest you move to replication 3 arbiter 1. Put the arbiter for servers 1 & 2 on server 3, and the arbiter for servers 3 & 4 on server 1.
https://gluster.readthedocs.io/en/latest/Administrator%20Guide/arbiter-volumes-and-quorum/
https://gluster.readthedocs.io/en/latest/Administrator%20Guide/arbiter-volumes-and-quorum/
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