to ditch hardware RAID, as that approach both limits flexibility as
well as locking you in.
do not have that option, so be careful).
If you're going to be using a SAN setup (e.g. fiber HBA), then you'd have
to see what the SAN is capable of, although I daresay many of them would
easily support something like that (invisible replication). I don't think
you'd need mdadm when using a modern-ish SAN, anyway.
Another possible idea to consider might be network RAID, Linux-style,
using NDB/DRDB/AoE, etc.
Henry Yen Aegis Information Systems, Inc.
Senior Systems Programmer Hicksville, New York