RAID controllers tend to use i960 or StrongARM CPUs that run at speeds
that _aren't_ all that impressive. With software RAID, you can take
advantage of the _enormous_ increases in the speed of the main CPU.
I don't know so much about FreeBSD's handling of this, but on Linux,
there's pretty strong indication that _SOFTWARE_ RAID is faster than
Unless something has changed though, you can't run raid 10
with linux software raid and raid 5 sucks for heavy writes.
It has the further merit that you're not dependent on some disk
formatting scheme that is only compatible with the model of RAID
controller that you've got, where if the controller breaks down, you
likely have to rebuild the whole array from scratch and your data is
The assumptions change if you're looking at really high end disk
arrays, but that's certainly another story.
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