RE: [MLUG - DISCUSSION] IDE and SCSI etc

["Ryan Thornton" <EMAIL:PROTECTED>]

New SATA drives come very close to SCSI performance at a cheaper price.

http://www.storagereview.com/articles/200311/20031111WD740GD_1.html

It's still not a solution for servers but for single user desktops it's got
merit.

- - Ryan



-----Original Message-----
From: EMAIL:PROTECTED
[mailto:EMAIL:PROTECTED]On Behalf Of Jim Bradley
Sent: Sunday, February 01, 2004 2:03 PM
To: EMAIL:PROTECTED
Subject: Re: [MLUG - DISCUSSION] IDE and SCSI etc


All of the reviews that I've ever read about scsi vs. ide have stated that
on a
user desktop, there's not generally going to be a noticible difference, only
on
a server with multiple user requests occurring simultaneously.  The greatest
benefit that I've had with SCSI hasn't been mentioned (or I missed it), and
that's the freeing up of interrupts with multiple devices, and the ability
to
daisy chain multiple drives and devices. I had a machine that I ran for a
while
that was interrupt challenged, as I had cards in each slot, and they all
wanted
an interrupt or two. By disabling the IDE ports and using SCSI, I was able
to
have 3 hard drives, 2 cdroms (one was a burner, the other plain), and a
scanner, and only using one interrupt. In addition to cost (though they're
more
expensive, most SCSI drives have a 5 year warranty, while most IDE/ATAPI
drives
only give one year) another problem that can be a PIA is that many
distributions don't compile the linux kernel with builtin scsi, but only
modular scsi. This can give you a kernel panic error at bootup until you
either
recompile the kernel yourself, or you run mkiinitrd to create a new ramboot
file.


> I tried locating the two pieces of data on two different disks with two
> different IDE controllers, and the results were spectacular - a five fold
speed
> increase in the application - just as good as using a single SCSI disk.

Jim Bradley -- Maryville, MO USA
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