Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: version B 2.10.2 9/18/84; site wdl1.UUCP Path: utzoo!watmath!clyde!burl!ulysses!mhuxr!mhuxn!ihnp4!alberta!ubc-vision!uw-beaver!tektronix!hplabs!hpda!fortune!wdl1!kimery From: kimery@wdl1.UUCP (Sam Kimery) Newsgroups: net.unix-wizards Subject: Re: How many users on an 11/73? Message-ID: <491@wdl1.UUCP> Date: Sat, 13-Jul-85 00:04:52 EDT Article-I.D.: wdl1.491 Posted: Sat Jul 13 00:04:52 1985 Date-Received: Wed, 17-Jul-85 06:04:50 EDT References: <223@thunder.UUCP> <460@wdl1.UUCP> <173@motel6.UUCP> Organization: Ford Aerospace, Western Development Laboratories Lines: 36 > In article <460@wdl1.UUCP> kimery@wdl1.UUCP (Sam Kimery) writes: > > > >users) These 24 users were logged in always, and we had better response > >time than an 11/70 with one or two users. This was running RSTS (ugh!) > >with rsx and rt-11. > > > > I would say that it all depends on your i/o systems. I have an > 11/73 with dlv11 serial interfaces and a 5.25 inch hard disk system > running through a xebec card. The serial interfaces are > per-char interrupt on input and output. 9600 baud max speed before > the cpu saturates. The xebec card has 1Mbit transfer rate, compared > to the ST506 5Mbit transfer rate and the SMD 18Mbit transfer rates > on real computers. > > I wouldn't think of putting more than 2 users on a system like this. > The 11/73 is a great cpu but the i/o system takes more out of > the computer than the cpu puts back in if you aren't careful. > Oh, this is running 2.9 unix with only 1/2Meg of memory, not that > it ever swaps but... > The first suggestion that I have comes straight from DEC (ooooh boy, here we go ....) DONT mix DZ & DH cards, the result is a VERY brain damaged system that runs slower than my deisel rabbit. We chose to run the RC-25 drives. (26M fixed and 26M removable). These run on the average of 3 - 5 times faster than RL02's. The RC-25 drive has both the fixed and removable portions on the same spindle (UGH!). We were running DECTAP (manf & dist. package) with all 24 terminals at 19.2Kb. We were also running 1.5M of memory. Maybe we were just lucky........(?) Sam Kimery