[oclug] Need advice on server specs

[Andrew Hutton]

On Thu, Feb 01, 2001 at 02:45:39PM -0500, rjordan at CR1004964-A.slnt1.on.wave.home.com wrote:
> > Why go with SCSI?  It's simply expensive and slow if you don't NEED the
> > shared-media aspects.
> > 
> > The idea that SCSI is better/faster than IDE is *FALSE*, on the right
> > hardware IDE far outscales SCSI up to about 500G.
> I was pretty sure that the fastest SCSI, was a fair bit better
> than the fastest IDE. Is this really wrong?
> Ultra160 SCSI can do (up to) 160MB/sec vs. 100MB/sec of UDMA100, no?

Per channel.  We have cards with 8x66MB/sec channels.  You would need
to put in 4 SCSI hosts to get the same, and they're going 100MB/sec
soon.

> I know the price difference is not worth it for many applications,
> but it is still a 60% gains (or so). Any qualitative numbers to
> prove otherwise?

Check out the graphs on 3ware.com comparing heavy load on SCSI
vs IDE.  The SCSI dies when the bus saturates, we can saturate
PCI.

-- 
Andrew J. Hutton, 
Ottawa Linux Symposium, International Linux Developers Conference
http://www.linuxsymposium.org/    July 25th-28th, 2001