Availability Suite is comprised of two primary components:
- Instant Image, which siphons data on a disk device as it is written in real time and stores it on another device. A command snapshots this stream, creating a point in time “shadow copy” of what’s on the live storage device. This shadow copy can then be mounted and used as one would with a normal filesystem. In practice, this is similar to what you get with ZFS’s snapshot feature, only this is filesystem-agnostic.
- Network Data Replicator – This is (in my opinion) the cream of this product. Like Instant Image, NDR interposes itself above a disk device and sends a copy of the data stream to that device to somewhere else, such a across the network to another server. This is real time remote replication.
I applaud Sun for releasing this! OpenSolaris now has far more and robust storage tools than any other FOSS (or otherwise, for that matter) OS out there.
Hey Sun, how about releasing ESM AA next, eh? There’s Aperi, but ESM AA looks to be far more mature.