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No idea, I actually came to the comments for the same reason: looking for details about the storage. In my opinion it's either zfs or netapp. Zfs can replicate datasets via zfs send, netapp has a snapmirror functionality that does basically the same. Also, iirc, netapp is contributor to freebsd, so it might be zfs anyway underneath. I wouldn't be surprised. Last time I had the pleasure to create a snapshot for a volu…
Yeah zfs send (and a bunch of other features/architecture choices) have been one of the biggest reasons I'm interested in the zfs ecosystem and kind of keep a lookout for it/finding ways to work it into infrastructure that I build. I know that Hardware RAID is what the big boys use, but assuming the performance hit is OK, the feature set of ZFS with a properly tuned database installation like a match made in heaven,…
Their enterprise version also has HA and other goodies.