Date: Wed, 21 Aug 1996 20:36:15 -0700 From: Darryl Okahata <darrylo@hpnmhjw.sr.hp.com> To: richard@pegasus.com (Richard Foulk) Cc: freebsd-hardware@FreeBSD.ORG Subject: Re: SCSI again: Asus SC200 vs. Adaptec 2940 ... Message-ID: <199608220336.AA169064976@hpnmhjw.sr.hp.com> In-Reply-To: Your message of "Wed, 21 Aug 1996 11:12:48 -1001." <199608212113.LAA20249@pegasus.com>
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> How do these two boards actually compare? Disregarding drivers
> are they fairly similar in capability and speed?
The NCR driver is quite nice. It's certainly hard to go wrong for
the money. Here are some benchmarks, using an NCR815-based controller:
-------------------------------------------------------------------------------
***** Bonnie:
-------Sequential Output-------- ---Sequential Input-- --Random--
-Per Char- --Block--- -Rewrite-- -Per Char- --Block--- --Seeks---
Machine MB K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU /sec %CPU
PCI/Q4.0 256 3350 66.8 3387 14.8 2027 15.9 4671 90.0 6065 24.6 87.5 4.1
***** IOZONE:
$ time iozone 256
Writing the 256 Megabyte file, 'iozone.tmp'...77.492188 seconds
Reading the file...43.460938 seconds
IOZONE performance measurements:
3464032 bytes/second for writing the file
6176476 bytes/second for reading the file
-------------------------------------------------------------------------------
This is on a P133, with 64MB 60ns parity FPM DRAM, ASUS P55T2P4 w/512K
PB cache, a 4GB Quantum Atlas (34300S), and a DTC 3130B SCSI controller.
Note that these measurements were *NOT* done on the outer tracks of the
drive; the drive was half-full when these benchmarks were done, and so
I'd guess that they were done around the tracks 1/3 of the way in.
> BTW: who has the best mail-order price for these things?
The NCR(now Symbios)-based controllers aren't easy to find. If you
have an ASUS, the ASUS SC-200 appears to be good. If you don't have an
on-board NCR BIOS, the Data Technology DTC 3130B ("B" for "BIOS") is
good (it's a narrow, fast SCSI-2 controller). NECX sells it for around
US$105. Very nice.
[ Yes, I know that I don't need an NCR controller with a BIOS, as my
ASUS motherboard has an NCR BIOS, but I had some difficulty locating
an SC-200. ]
-- Darryl Okahata
Internet: darrylo@sr.hp.com
DISCLAIMER: this message is the author's personal opinion and does not
constitute the support, opinion, or policy of Hewlett-Packard, or of the
little green men that have been following him all day.
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