DECstation SCSI buses

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Article #1429

#1429

From: Rob McNicholas
Date: Fri, 04 Sep 1992 22:41

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I have a DECstation 5000/125 with one on-board SCSI bus (of course)
and one TurboChannel SCSI bus (PMAZ-AA).  I've heard a rumor that the
on-board bus uses DMA, but the TC one doesn't.  Is this true?

If this is true, how do people recommend I configure my devices?  I
have 3 RZ57s (pretty heavy use during the day), one RRD42 (hardly ever
used), 3 8mm EXB-8200s (one is used heavily at night for backups, the
others used for occasionally making tape copies, and to serve as
spares in an emergency), and one TZK50 (only used when DEC ships us
something on TK50).  Should I put all the tapes on the non-DMA bus?  I
remember that back when I had a 3100 (no DMA), any tape I/O would
bring the system to its knees, so I'm not sure if this is the right
thing to do.

Thanks for any advice,

-Rob
--
Rob McNicholas     	    Technical & Computing Services, EECS, U.C. Berkeley
robm@ataraxia.berkeley.edu  Voice: 510/642-8633  FAX: 510/643-7846

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From: robm@ataraxia.Berkeley.EDU (Rob McNicholas)
Newsgroups: comp.sys.dec
Subject: DECstation SCSI buses
Message-ID: <ROBM.92Sep4154132@ataraxia.Berkeley.EDU>
Date: 4 Sep 92 22:41:32 GMT
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