Date: Wed, 19 May 1999 09:09:22 +0930 From: Greg Lehey <grog@lemis.com> To: Palle Girgensohn <girgen@partitur.se> Cc: freebsd-scsi@FreeBSD.ORG Subject: Re: Will IDE disks impact SCSI or system performance? Message-ID: <19990519090922.D89091@freebie.lemis.com> In-Reply-To: <37416684.64A54C87@partitur.se>; from Palle Girgensohn on Tue, May 18, 1999 at 03:09:24PM %2B0200 References: <37416684.64A54C87@partitur.se>
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On Tuesday, 18 May 1999 at 15:09:24 +0200, Palle Girgensohn wrote: > Hi! > > Our main internal server, FreeBSD 3.2b with five large SCSI disks, > running vinum and softupdates etc... It fast, and we're happy. It runs > both filesharing (mainly NFS) and applications. > > Now some guys here are interested in having a large archive with > not-so-important data (read mp3 files...) and suggest a large IDE disk > for almost no money at all. > > My question: will an IDE disk in a now SCSI-only system impact > performance for the rest of the system? Julian sort of answered this, but to be sure: if you run DMA, it shouldn't make any difference. If you run it in PIO mode, you can end up using up to 90% of the processor in interrupt code, which will make it seem like it's grinding to a halt. Greg -- See complete headers for address, home page and phone numbers finger grog@lemis.com for PGP public key To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-scsi" in the body of the message
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