[one-users] Shared File System HA

[Marshall Grillos]

I am debating the differences between Shared and Non-shared file systems for an OpenNebula deployment.

One concern with the shared file system is High Availability.  I am setting up the OpenNebula front-end with connectivity to a storage device.  To avoid the event of a storage device failure (RAID controller, Power, etc) I am looking into setting up a secondary front-end server with attached storage.  I would use NFS to share the storage to each VM Host and setup DRDB for block level replication between each cluster node.  In the event of a storage failure, a failover would occur utilizing heartbeat/pacemaker to the secondary front-end server.

If anyone has tested a similar setup how do the VMs handle the minimal outage required for the failover to occur (the several seconds required to failover to the secondary front-end)?  For a certain duration, wouldn't the NFS mount be unavailable due to the failover mechanism?

Thanks,
Marshall
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