Date: Wed, 18 Sep 1996 17:31:29 -0500 (EST) From: "John S. Dyson" <toor@dyson.iquest.net> To: freebsd-scsi@freebsd.org Cc: freebsd-current@freebsd.org, freebsd-isp@freebsd.org Subject: Re: Streamlogic RAID array benchmarks Message-ID: <199609182231.RAA01314@dyson.iquest.net> In-Reply-To: <Pine.NEB.3.92.960917173042.7033P-100000@zap.io.org> from "Brian Tao" at Sep 18, 96 06:12:07 pm
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> > Iozone 2.01 from the packages collection showed a dramatic > difference in favour of the non-RAID drive. It was over twice as fast > as the RAID both in block reads and block writes. I'm a little > suspicious of the read numbers for the single drive... I thought the > ST15150N's maxed out at around 6.5MB/s (at least on narrow > controllers)? I'm seeing over 8MB/s on a single drive. Does the > 2940UW make that much difference even on narrow drives? The test file > size was 128MB. Size is the data block size, Write and Read are in > bytes per second. > If you are running -current (I forgot to check), and since you have 64MBytes, the buffer cache will help even though it is overrun. The buffer cache policy is NOT pure LRU, and you will see the effects of it on a 64MByte system even for a 100MByte benchmark. John
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