Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Path: utzoo!mnetor!uunet!husc6!mit-eddie!genrad!decvax!cg-atla!gilgut
From: gilgut@cg-atla.UUCP (Steve Gilgut)
Newsgroups: comp.unix.questions,comp.unix.wizards
Subject: Re: Ultrix disk transfer rates with UDA50s and RAxx disks
Message-ID: <797@cg-atla.UUCP>
Date: Fri, 4-Sep-87 11:42:55 EDT
Article-I.D.: cg-atla.797
Posted: Fri Sep  4 11:42:55 1987
Date-Received: Sat, 5-Sep-87 21:38:53 EDT
References: <157@tijc02.UUCP>
Reply-To: gilgut@cg-atla.UUCP (Steve Gilgut)
Organization: Compugraphic Corp. Wilmington, MA
Lines: 18
Xref: mnetor comp.unix.questions:3895 comp.unix.wizards:4092

In article <157@tijc02.UUCP> seb022@tijc02.UUCP (Scott Bemis         ) writes:
>I am currently using a port of AT&T UNIX V Release 2.0 Version 2 on a VAX 8600,
>with two UDA50 disk controllers.  Each UDA50 disk controller has it's own
>Unibus. There are 1 RA60 disk drive and two RA81 disk drives on one UDA50
>disk controller, and 1 RA60 disk drive and three RA81 disk drives on the
>second UDA50 disk controller.  My disk transfers are very SLOW. For example,

I would never put more than 2 raXXs on a UDA50, and I only put 3 ra81s
on each of my kdb50s. The one exception is I have an ra60 on controller
zero, and only because it gets used about twice a month.

I have found the Unibus to be a bottleneck in my 11/785 and 11/750
experience. I do congratulate you on running two Unibus controllers.
That's a big help. With the Unibus, you can only talk to one controller
at a time, so at most, you can talk to two drives at once. Be a hero,
and buy a VAX with the BI architecture. Now that I have an 8700 running
Ultrix 2.0, with 5.5 Gig of disk, why, I'd rather fight than switch!
				Steve