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Newsgroups: comp.unix.bsd.freebsd.misc
Subject: Re: Ultra Wide Scsi - which controller?
Message-ID: <slrn5m1cdk.c4q.streiner@goofy.co.iup.edu>
From: streiner@co.iup.edu (Justin M. Streiner)
Date: 25 Apr 97 09:26:13 EST
References: <5j5gla$r88$1@csnews.cs.colorado.edu> <5j7ifv$f97$2@polaris.eurocontrol.fr> <5jleol$796$1@colias.tutics.tut.ac.jp>
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In article <5jleol$796$1@colias.tutics.tut.ac.jp>, Sarif Koichi
<sarif@luehdorfia.dsl.tutics.tut.ac.jp.> wrote:
>>> Tell him to remember that 2x 2 GB is better than 1x 4 GB.
> Oops, I just ordered a 4 GB hard drive.
> Could you tell me some logical explanation about this.
> With one drive, it's true that bigger the capacity is the better. If
>you put 2 G in one cylinder and 4 G on another cylinder, with the same
>rpm spec, in the same time you get twice the data with the latter
>drive. But still the difference is small (subjective opinion).
Reasons for getting two smaller-capacity drives instead of one
larger-capacity drive:
1) SCSI bus throughput may be improved. Remember that you're limited by
the average transfer rate of each drive, the the throughput of the bus for
your disk traffic. Putting everything on one drive limits you to
<10MB/sec in most cases.
2) (some level of) fault tolerance. If you have one disk and it fails,
you're down until you can get a replacement drive, install it, and restore
from your most recent backup (you DID make backups, right? :) )
my 2 cents
jms
--
-- justin m streiner --------------------------------------------------------
Systems Administrator WINDOWS '95 BUG REPORT FORM
IUP Math / Computer Science Please describe the bug in detail in
email: streiner@co.iup.edu the space below. Write legibly.
web: http://www.co.iup.edu/~streiner ____
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