12 Mar
2002
12 Mar
'02
5:48 a.m.
From: Doc
On Tue, 12 Mar 2002, Christopher Smith wrote:
Doc - As someone who never played with RAID before, can you provide an
example setup, or two?
--- David A Woyciesjes
--- C & IS Support Specialist
--- Yale University Press
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Mac OS X 10.1.2 - Darwin Kernel Version 5.2: Fri Dec 7 21:39:35 PST 2001
Running since 01/22/2002 without a crash
Anyway, shouldn't a decent RAID allow you to
select the mode
so that it only does striping ?
Didn't I say "reliable"? Even RAID 0, plain striping, carries a
certain overhead in drivespace. The big problem is that with simple
striping you lose everything if you lose anything. RAID is *expensive*,
even if you get your adapter free. Drivespace overhead, tuning slices,
matching drives, power consumption, noise, etc. BIG cost is the
price of drives, for example 5x9G drives vs. 1x36G.
<My Not-So-Humble Opinion>
A multi-channel adapter or multiple adapters, running JBOD, with
intelligent filesystem groupings, will probably boost your speed as much
as RAID will. (Assuming a single-user general-use Unix desktop.) RAID
can be tuned to big sequential reads or writes, or a lot of small r/w,
but it's damn difficult to get middle-ground or all-around performance.
</My Not-So-Humble Opinion>
All that said, it's good practice and fun.
Doc