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- Newsgroups: comp.sys.sgi
- Path: sparky!uunet!spool.mu.edu!yale.edu!jvnc.net!darwin.sura.net!sgiblab!sgigate!odin!sgi!classic.asd.sgi.com!jeremy
- From: jeremy@classic.asd.sgi.com (Jeremy Higdon)
- Subject: Re: SMD disk question
- Message-ID: <pt858rg@sgi.sgi.com>
- Sender: jeremy@classic.asd.sgi.com
- Organization: Silicon Graphics, Inc. Mountain View, CA
- References: <1576@rwja.umdnj.edu>
- Date: Wed, 16 Sep 1992 00:07:44 GMT
- Lines: 25
-
- In article <1576@rwja.umdnj.edu>, elkins@rwja.umdnj.edu (George Elkins) writes:
- >
- > We have an Iris 4D/120 (running Irix 4.0.5) with the following SMD
- > disk controller and two 1.2 Gb SMD disks in an external 4-drive
- > cabinet, shown below from hinv.
- >
- > Xylogics 754 4-drive SMD disk controller 0: Firmware version 2.7.0
- > SMD Disk drive: unit 1 on Xylogics controller 0
- > SMD Disk drive: unit 0 on Xylogics controller 0
- >
- > Question: If I put in two more of these disks strictly for remote use
- > on another 4D/120 via NFS, how much could the additional disk I/O
- > affect the CPU performance, SMD disk controller performance and access
- > to the two original disks?
-
- The affect would depend on how much the two additional disks were used.
- Since you're only using it for NFS, the CPU has to handle the extra
- NFS traffic. On the disk side, the worst case would be that you always
- have some NFS generated request outstanding in which case half the
- requests would service the extra disks. So the original disks could
- see up to 50% less performance. But it really depends on how much
- you use the new ones.
-
- jeremy
-
-