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- From: olson@anchor.esd.sgi.com (Dave Olson)
- Newsgroups: comp.sys.sgi.hardware
- Subject: Re: RAID (disks) questions.
- Message-ID: <up56s94@zuni.esd.sgi.com>
- Date: 12 Jan 93 06:20:39 GMT
- References: <145785@lll-winken.LLNL.GOV>
- Sender: news@zuni.esd.sgi.com (Net News)
- Organization: Silicon Graphics, Inc. Mountain View, CA
- Lines: 40
-
- In <145785@lll-winken.LLNL.GOV> wiltzius@anduin.ocf.llnl.gov (Dave Wiltzius) writes:
- | Is anyone using RAID (disks) on an SGI (or any other machine,
- | actually)?
- |
- | If so, I would be interested in posing a few questions such
- | as what application you are using, the performance gains you
- | are experiencing and the extent of your software modifications
- | to achieve this performance gain.
-
- You are very unlikely to see a performance gain over seperate
- disks, unless you have a lot of file i/o that has to be to a single
- partition, and get a very high performance RAID and a controller
- to match. In general RAIDs have lower performance and much higher
- cost than independent disks, and the only reason for going with
- a RAID is if you get one that supports hot sparing of drives and
- automatic regeneration of parity, etc. afterwards.
-
- | If you are accessing data on RAID via a network file service
- | (presumably NFS), what is your network media and how much of
- | a performance hit did you take going via NFS?
-
- Even a single SCSI disk is far faster than NFS over ethernet.
- FDDI is still faster than a single disk (for another year or so),
- unless you have a high end IPI drive, which can be faster than even
- FDDI. Unless you are trying to set up a large fileserver for some
- other reason than performance, you don't want to access RAID over
- any current network (well, maybe Ultranet would do for another couple
- of years).
-
- | If any SGI folks and get me any info, I would be very interested.
- | We are seriously considering using RAID on an SGI 440. My sales
- | person is in training for the next few days; still...
-
- There are 3rd parties selling RAID for SGI, but we don't have an
- officially approved SGI RAID yet, although I believe there is work
- being done on RAID for the not too distant future.
- --
- Let no one tell me that silence gives consent, | Dave Olson
- because whoever is silent dissents. | Silicon Graphics, Inc.
- Maria Isabel Barreno | olson@sgi.com
-