Article 2822 of alt.sys.pdp10: Path: nntp1.ba.best.com!news1.best.com!newsfeed.mathworks.com!portc01.blue.aol.com!nntp2.aus1.giganews.com!nntp3.aus1.giganews.com!news1.giganews.com.POSTED!barn.net1plus.com From: R.J.S. Newsgroups: alt.sys.pdp10 Subject: Re: RH-10, DF-10, many disks? Organization: Very Organized Message-ID: References: <3A3EBBFA.697CC1D5@prescienttech.com> <91sriv$1mce$1@nntp1.ba.best.com> X-Newsreader: Forte Agent 1.8/32.548 X-No-Archive: yes MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Original-NNTP-Posting-Host: 192.168.1.12 X-Original-Trace: 22 Dec 2000 13:37:00 -0500, 192.168.1.12 Lines: 32 NNTP-Posting-Date: Fri, 22 Dec 2000 12:52:47 CST X-Trace: sv2-z3LV+C8VuKrlDZ3W4rrXPevhIDYI7Jw0PA+/XQZwbs9yyE2nhLkd3hNcdVDwuJJca+UEDG1+6U2clml!2/d7xh1tfgPHwSFFpRC8tU71YwA= X-Complaints-To: abuse@GigaNews.Com X-Abuse-Info: Please be sure to forward a copy of ALL headers X-Abuse-Info: Otherwise we will be unable to process your complaint properly Date: Fri, 22 Dec 2000 18:52:47 GMT Xref: nntp1.ba.best.com alt.sys.pdp10:2822 On 21 Dec 2000 12:03:43 GMT, inwap@best.com (Joe Smith) wrote: >I know that the macros in COMMON imply that it is possible, but I've >not seen any system using more than one RH-10. Sites that needed >more than 8 disk drives tended to use IBM disks on an SA-10. > >Tymshare had two KLs with four strings of eight 3350 disks. >Our DSKB had consisted of 27 units, with 300 MB per unit. >The restriction on the maximum size of DSKB was that three bit tables >had to be less than 256 KW. > -Joe We used to go over to F.A & T. to help with problems and from time to time they would build a "special system" for us out of 2 or 3 customer systems that were about to ship. One such request was a 2 CPU system that had huge amounts of disks. (So we could actually test the stuff for supporting lots of disks.) IIRC, it had 2 RH10s, and 4 RH20's per CPU, all the disks were dual ported in various (e.g. all possible) configurations, and each string had 8 disks. (all RP06's) A total of 40 drives. We went off and built a monitor for the sucker, and it worked!!! Well, I remember we did find one bug, but it was an easy fix. I think RDH and Gilbert actually did the testing. Also, I think that 1026 had 2 RH10's on it as well. One was for all the RS04's (Three cabs worth of swap space), and the other ran some of the system and user disks.