I have two other requirements that at least until now have favored "build" 
rather than "buy": encryption at rest and incremental upgradability. By the 
latter, I mean being able to expand storage by adding or replacing one or more 
of the drives vs. swapping out a whole chassis.

What I really want is an open-source equivalent of the Isilon system. You build 
up a NAS system as 3 or more of these auto-replicating chasses. But EMC bought 
that company out, and even back in their early days it was a high-priced system 
(albeit half the price per-gig of anything EMC).

In the future I'd like to have replication to cloud systems I manage myself, 
once the price of cloud servers comes down and fiber-optic gigabit Internet 
comes to my house. Hopefully I don't have to move to Korea where you can 
already do that. :-/ So the cluster-software management tools should work the 
same on local hardware as cloud servers. There's not much investment in that 
niche anymore, though.

-rich
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