From owner-freebsd-questions  Sat Apr  3  3:32:50 1999
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Date: Sat, 3 Apr 1999 06:30:51 -0500 (EST)
From: <mike@seidata.com>
To: freebsd-questions@freebsd.org
Subject: RAID
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Hey,

I'm setting up a RAID5 array using a Mylex DAC960SX controller.  The
Mylex has 6 channels...  I have Adaptec 2940 and 3940 controllers at
my displosal.  I'm using 18GB IBM DGHSU (XP?) drives (16 of them in
two 8-bay enclosures).

I'm curious about the most efficient/robust way to configure the
array.  Here's one way:

  +-------+     DC0     +-------+
  | Mylex |-------------| Bay 1 |--+
  +-------+             +-------+  |
     |                             |
     |HC0               +-------+  |
  +------+              | Bay 2 |--+
  | 2940 |              +-------+
  +------+                  T

DC0 - Drive Channel 0
HC0 - Host Channel 0
T - Terminator

Another I've considered is:

  +-------+     DC0     +-------+
  | Mylex |-------------| Bay 1 |T
  |       |---------+   +-------+
  +-------+     DC1 |   +-------+
     | |            +---| Bay 2 |T
  HC0| |HC1             +-------+
  +------+
  | 3940 |
  +------+

Any comments or suggestions appreciated.  I'm also looking for general
suggestions/precautions for using such an array with FreeBSD.

Thanks,

					-Mike




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