Path: utzoo!utgpu!news-server.csri.toronto.edu!bonnie.concordia.ca!uunet!elroy.jpl.nasa.gov!usc!jarthur!euler.claremont.edu!dhosek From: dhosek@euler.claremont.edu (Don Hosek) Newsgroups: comp.os.msdos.desqview Subject: Re: Hyperdisk Message-ID: <1991May11.213507.1@euler.claremont.edu> Date: 12 May 91 04:35:07 GMT References: <2725@lee.SEAS.UCLA.EDU> <9FDT21w164w@halcyon.uucp> Sender: news@jarthur.Claremont.EDU Organization: Harvey Mudd College Lines: 35 In article <9FDT21w164w@halcyon.uucp>, halcyon!ralphs@seattleu.edu (Ralph Sims) writes: > small@turing.seas.ucla.edu (James F. Small) writes: >> Hyperdisk, where can I find this beast? > Simtel-20 as HYDK421.ZIP in the pd1: directory. Hey, > this looks pretty good! It's supposed to release time slices and so > far hasn't barfed. I loaded a 2-meg cache in high memory and get about > a 90% read hit and 32% write hit. There's caveats about letting it > do 'staged write' (delayed disk writes), and since I have umpty-dozen > things happening simultaneously, decided not to press my luck. It > also helped me fake a 4-meg data throughput on my hard drive. I've been using staged-write on my hard disk since installing hyperdisk and the only problem I encountered was when I ran OPTIMIZE. The problem should be obvious (for those who are still in the dark, remember that OPTIMIZE reboots the PC). I've disabled staged write to the floppies as much as it helped my performance since my primary use of my floppy drives is for backups and it was too difficult to tell whether hyperdisk was done with the write or not for flipping disks. Maybe when I get around to writing my library backup program I'll include support for hyperdisk staged writes so I can go back to it (It's a pity that there seems to be no way of having different settings for different DV windows with Hyperdisk, but that, I suppose, would require a DV-specific cache. -dh --- Don Hosek dhosek@ymir.claremont.edu Quixote Digital Typography 714-625-0147