Date: Fri, 22 Oct 1999 10:07:11 -0400 From: Mike Tancsa <mike@sentex.net> To: Geoff Buckingham <geoffb@chuggalug.clues.com> Cc: freebsd-current@FreeBSD.ORG Subject: Re: AMRD (MegaRAID) BIOS rev another other questions Message-ID: <3.0.5.32.19991022100711.01dd8c90@staff.sentex.ca> In-Reply-To: <19991022140949.A82396@chuggalug.clues.com> References: <3.0.5.32.19991020143339.016e0210@staff.sentex.ca> <3.0.5.32.19991020143339.016e0210@staff.sentex.ca>
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At 02:09 PM 10/22/99 +0100, Geoff Buckingham wrote:
>The near 100 CPU use during the seek test combined with very high numbers of
Thanks for the pointers. It certainly gives me direction to look in. This
is my first foray into RAID, so I am just starting exploring the
technology. Also, my first venture into current. I must say I am bit
suprised at how... well stable it all is so far. I am almost tempted to
put it into the mix as a test proxy server for our customers after I get a
little better sense of the various RAID params to tweak.
Here are some results using 5 Seagate 1gig 5400 RPM drives (bought at
onsale for $25 each BTW! cheap way for me test things out!)
RAID 5, Writeback cache, 128K stripe, 16M of cache on the controller, 64M
of RAM on the PII 300.
First result is the array (R), second (I) is a
wdc0: unit 0 (wd0): <QUANTUM FIREBALL CX6.4A>, LBA, DMA, 32-bit,
multi-block-16
Both drives are mounted async, noatime
-------Sequential Output-------- ---Sequential Input-- --Random--
-Per Char- --Block--- -Rewrite-- -Per Char- --Block--- --Seeks---
MB K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU /sec %CPU
R200 14879 93.8 16137 32.0 2231 5.6 10548 76.9 12749 17.0 107.8 1.8
I200 9759 61.4 9759 18.5 3894 10.1 12328 91.4 12839 17.8 133.3 2.1
R768 14844 93.3 15495 31.1 2029 5.1 10935 79.8 13031 17.5 75.3 1.4
I768 9787 61.9 9915 19.0 4265 10.9 12714 94.5 15604 21.9 73.3 1.3
---Mike
------------------------------------------------------------------------
Mike Tancsa, tel 01.519.651.3400
Network Administrator, mike@sentex.net
Sentex Communications www.sentex.net
Cambridge, Ontario Canada
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