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http://kubernetes.io/docs/admin/high-availability/
https://coreos.com/blog/improving-kubernetes-scheduler-performance.html – mentions "separate etcd cluster"
Gluster
http://www.gluster.org/community/documentation/index.php/QuickStart
"Have at least two nodes"
Failover
Even though the client appears to be mounting from a single server, apparently the client is smart enough to get information about available peers during mount.
Performance monitoring
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