Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!sun-barr!olivea!uunet!auspex!yuping
From: yuping@auspex.auspex.com (YuPing Cheng)
Newsgroups: comp.periphs
Subject: Re: Disk Performance
Keywords: SCSI IPI
Message-ID: <5705@auspex.auspex.com>
Date: 4 Feb 91 17:52:13 GMT
References: <934@arccs2.fed.FRB.GOV>
Organization: Auspex Systems, Santa Clara
Lines: 21

In article <934@arccs2.fed.FRB.GOV> rcd@fed.frb.gov (Bob Drzyzgula) writes:
>Is there any reason to prefer a 3.0 MB/Sec
>IPI over a 5.0 MB/Sec SCSI? Is there any difference between the
>performance characteristics of the two interfaces that would make one
>decide that one humungus 4.67 MB/Sec IPI drive is better than two
>half-humungus 5.0 MB/Sec SCSI drives, even if the cost is a little
>higher? What about the 9.34 MB/Sec drive? What is the state of IPI
>controllers and SCSI host adaptors to handle these speeds, and how do
>they hold up with multiple devices attached? How do characteristics of
>the workload affect these arguments?

We have done extensive study on the disk drive performance and published
the following paper:

 "The Myth of Transfer Rate, The Anatomy of an NFS I/O Operation, How and
 Why SCSI is Better than IPI-2 for NFS?" by Bruce Nelson and Yu-Ping Cheng.
 Technical Report #6, Dec. 1990, Auspex Systems Inc.

If you are interested please send mail to me.

	Yu-Ping Cheng, Auspex Systems Inc. ycheng@auspex.com.