Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: utzoo!mnetor!uunet!seismo!gatech!mcdchg!usenet From: pavlov@hscfvax.UUCP (840033@G.Pavlov) Newsgroups: comp.unix Subject: Re: Ultrix 2.0 and disk performance Message-ID: <1124@mcdchg.UUCP> Date: Thu, 16-Jul-87 12:39:07 EDT Article-I.D.: mcdchg.1124 Posted: Thu Jul 16 12:39:07 1987 Date-Received: Sat, 18-Jul-87 08:01:23 EDT Sender: usenet@mcdchg.UUCP Distribution: na Organization: Health Sciences Computing Facility, Harvard University Lines: 15 Keywords: problem ultrix disk i/o Approved: usenet@mcdchg.UUCP We installed Ultrix 2.0 on one of our uVAX II's. Have noticed a substantial drop ( 25-35% ) in disk throughput, for single tasks sequentially accessing large files ( the problem may exist for other types of applications as well; sequential i/o is the only thing we looked at closely). Our disks are Fuji M2333k's (300 meg) controlled by Emulex QD32's. DEC claims no known problems; says throughput has improved for their own small disks. I would appreciate hearing from anyone running Ultrix 2.0 on uVAX II's re their experiences to date on this subject (regardless of who manufactured the disks). many thanks, greg pavlov, fstrf, amherst, ny. ...!hscfvax!pavlov