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- From: olson@anchor.esd.sgi.com (Dave Olson)
- Subject: Re: Exebyte 8500 config on a Crimson
- Message-ID: <s8hl4nk@zuni.esd.sgi.com>
- Sender: news@zuni.esd.sgi.com (Net News)
- Organization: Silicon Graphics, Inc. Mountain View, CA
- References: <1992Nov10.172707.29397@seismo.do.usbr.gov>
- Date: Thu, 12 Nov 92 02:51:52 GMT
- Lines: 22
-
- In <1992Nov10.172707.29397@seismo.do.usbr.gov> geomagic@seismo.do.usbr.gov (Dan O'Connell) writes:
- | We installed an Exebyte 8500 on a Crimson running 4.0.5C. It has
- | a Peripheral Visions compression board with a front door display
- | panel. We have make all the various devices for it; tps1d4, tps1d4.8200,
- | tps1d4.8500, tps1d4nr, tps1d4nr.8200, tps1d4nr.8500, etc.
- | When we write to using tar, we never get a transfer rate exceeding
- | 120 Kbytes/sec. We have tried both 8500 and 8200 modes, with and without
- | compression. We get about 180 Kbytes/sec writting to our 4mm DAT drive.
- |
- | We expected to get 300-400 Kbytes/sec transfer rates with the Exebyte
- | in 8500 mode. Is there something obvious we should look for that would
- | explain the poor Exebyte performance?
-
- Probably the compression board is the bottleneck. You should
- see at least 400K/sec on a normal 8500, assuming the program doing
- the writing isn't horribly slow.
-
- 180 KB/s for DAT is just about right.
- --
- 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
-