Article View: aus.cdrom
Article #499Re: Adding CDROM slows down SCSI subsystem?
From: Paul Antoine
Date: Thu, 18 Feb 1993 03:48
Date: Thu, 18 Feb 1993 03:48
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2196 bytes
In <1993Feb16.141718.5519@illian.mnet.com> darylm@illian.mnet.com (Daryl V. McDaniel) writes: > Our evaluations of the NEC 74 and 84 drives show that in most regards > they are some of the faster CD-ROM drives available. However, they > have a serious flaw if you are puting them on a SCSI bus with other > devices. The problem is that they don't disconnect when seeking, > doing error recovery, etc. Since CD-ROM drives take a L O N G time > to seek, this causes significant performance degradation. If you > should be unlucky enough to encounter a media error that causes a > "rezero" in the drive, you will notice that the bus is "hung" for > about 3 seconds. This is not acceptable for multitasking systems > that are trying to access other devices on the same bus. Is this known to occur on any other brands of SCSI CD-ROM drives? Paul ------------------------------------------------------------------------------ Paul Antoine, Softway Pty Ltd Net: paul@suite.sw.oz.au PO Box 305, Strawberry Hills, NSW 2012, Australia Tel: +61 2 698 2322 79 Myrtle St, Chippendale, NSW 2008, Australia Fax: +61 2 699 9174 ------------------------------------------------------------------------------
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X-Google-Language: ENGLISH,ASCII-7-bit X-Google-Thread: 10ed01,a9fec654360c0716 X-Google-Attributes: gid10ed01,public X-Google-Thread: ff6c9,a9fec654360c0716 X-Google-Attributes: gidff6c9,public X-Google-Thread: fbad3,a9fec654360c0716 X-Google-Attributes: gidfbad3,public X-Google-ArrivalTime: 1993-02-17 19:48:28 PST Newsgroups: aus.cdrom,alt.cd-rom,comp.periphs.scsi Path: arc1-ca.pugleaf.net!sparky!uunet!noc.near.net!news.Brown.EDU!qt.cs.utexas.edu!yale.edu!spool.mu.edu!howland.reston.ans.net!gatech!darwin.sura.net!sgiblab!munnari.oz.au!metro!basser.cs.su.oz.au!swift!suite.sw.oz.au!paul From: paul@suite.sw.oz.au (Paul Antoine) Subject: Re: Adding CDROM slows down SCSI subsystem? Organization: Softway Pty Ltd Date: 18 Feb 93 03:48:28 GMT Message-ID: <paul.730007308@suite.sw.oz.au> References: <1993Feb8.225335.15289@cheops.qld.tne.oz.au> <k2.729244115@woodstock> <1993Feb16.141718.5519@illian.mnet.com> Sender: news@softway.sw.oz.au (Usenet) Lines: 22