Date: Wed, 19 May 1999 01:11:35 GMT From: mike@sentex.net (Mike Tancsa) To: freebsd-scsi@freebsd.org Cc: girgen@partitur.se Subject: Re: Will IDE disks impact SCSI or system performance? Message-ID: <37420f2c.77551222@mail.sentex.net> In-Reply-To: <MAIL19990519090922.D89091@freebie.lemis.com> References: <37416684.64A54C87@partitur.se> <MAIL19990519090922.D89091@freebie.lemis.com>
next in thread | previous in thread | raw e-mail | index | archive | help
On 18 May 1999 19:40:10 -0400, in sentex.lists.freebsd.misc you wrote: >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. But only when the disk is being accessed no ? Also, regarding the boot issue someone else mentioned, you should be able to take the reference to the drive out of the BIOS, and it will boot from your SCSI device. ---Mike Mike Tancsa (mdtancsa@sentex.net) Sentex Communications Corp, Waterloo, Ontario, Canada To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-scsi" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?37420f2c.77551222>