What is the minimal high available lustre installation.

Is a two node lustre installation considered stable?
i.e.
node1: MGS+MDT+MDS+DRBD(for MDT/MGS)+OST+OSS+client
node2: MGS+MDT+MDS+DRBD(for MDT/MGS)+OST+OSS+client

If you add a third/fourth node, I would assume it would be just:
node3: OST+OSS+client
node4: OST+OSS+client

Is there any reason why this wouldn't work for a high available cluster?
Is there a better way to configure a small cluster?


Thanks,


Jon.


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