[5366] in linux-scsi channel archive
Re: Dumb question: Which is "better" SCSI or IDE disks?
daemon@ATHENA.MIT.EDU (Christopher Smith)
Wed Dec 9 04:10:58 1998
Date: Tue, 8 Dec 1998 08:13:31 -0500 (EST)
From: Christopher Smith <cbsmith@envise.com>
To: Leonard Zhang System Administrator ISD RVIB <leonardz@rvib2.rvib.org.au>
cc: linux-kernel@vger.rutgers.edu, linux-scsi@vger.rutgers.edu
In-Reply-To: <Pine.SCO.3.96.981208092934.15190C-100000@rvib2.rvib.org.au>
On Tue, 8 Dec 1998, Leonard Zhang System Administrator ISD RVIB wrote:
> RAID-1 is disk mirror. DPT is cache with RAID. RAID will increase the
> disk performance.
Ugh.. FYI, RAID does not always increase disk performance, and in
particular RAID-1 is guarunteed not to increase disk performance by it's
very nature (ok, it's conceivable that read performance could be
increased somewhat, but write performance would, if anything, be decreased
somewhat). Again, if the cache is actually playing a role in this
benchmark, then what you are really saying is that IDE is so fast that
it's 4x faster than DPT's cache memory. Think about that for a minute.
--Chris
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