Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: utzoo!mnetor!uunet!seismo!uwvax!astroatc!johnw From: johnw@astroatc.UUCP (John F. Wardale) Newsgroups: comp.arch Subject: Re: Disk Striping (Really RAMs vs disks) Message-ID: <420@astroatc.UUCP> Date: Mon, 24-Aug-87 23:14:56 EDT Article-I.D.: astroatc.420 Posted: Mon Aug 24 23:14:56 1987 Date-Received: Wed, 26-Aug-87 04:44:04 EDT References: <414@astroatc.UUCP> <12718@amdahl.amdahl.com> Reply-To: johnw@astroatc.UUCP (John F. Wardale) Organization: Astronautics Technology Cntr, Madison, WI Lines: 32 In article <12718@amdahl.amdahl.com> chuck@amdahl.amdahl.com (Charles Simmons) writes: >In article <414@astroatc.UUCP> I wote: >> RAM vs disk stuff >Correct me if I'm wrong, but... >I was under the impression that not only did silicon memory double >in capacity every two years, but magnetic memory also doubled in >capacity every two years as well. I'm not sure about disk capacity .... anyone else care to comment? Current disk speeds are very close (factor of <=5 ??) to the speeds of 10 or 20 year old disks. My comments were in regard to disk *SPEED* (Stripping, parrallel head disks....) As RAMS get larger, it gets more practical to build reasonable sized RAM-disks (they may require more volume, and have higher $$/Mbyte (if your claim is true), but could be a great deal if you need XX Mbytes at a certain (high) speed!! As I look into my crystal ball, I see RAM and optical (WO) disks replacing magnetic memory within 5 years...(say, ~~~ 30% of total, and 90% of new systems/designs) -- John Wardale ... {seismo | harvard | ihnp4} ! {uwvax | cs.wisc.edu} ! astroatc!johnw To err is human, to really foul up world news requires the net!