Our organization uses a shared LUN set up with replication going between two data centers. Check out GPFS or GFS. We get local disk speeds on these shared mounts and we have yet to have a problem with them after we went live. Just expect to have to increase the amount of RAM available on your web nodes because these luns need a lot of page file space when performing write operations.
Hardware and performance
Resilience, Redundancy, Failover of Moodledata
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