Date: Wed, 19 May 1999 10:44:25 +0930 From: Greg Lehey <grog@lemis.com> To: Mike Tancsa <mike@sentex.net> Cc: freebsd-scsi@FreeBSD.ORG, girgen@partitur.se Subject: Re: Will IDE disks impact SCSI or system performance? Message-ID: <19990519104425.S89091@freebie.lemis.com> In-Reply-To: <37420f2c.77551222@mail.sentex.net>; from Mike Tancsa on Wed, May 19, 1999 at 01:11:35AM %2B0000 References: <37416684.64A54C87@partitur.se> <MAIL19990519090922.D89091@freebie.lemis.com> <37420f2c.77551222@mail.sentex.net>
next in thread | previous in thread | raw e-mail | index | archive | help
On Wednesday, 19 May 1999 at 1:11:35 +0000, Mike Tancsa wrote: > On 18 May 1999 19:40:10 -0400, in sentex.lists.freebsd.misc you wrote: That must be me! >> 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 ? Right. Sorry, I suppose I should have mentioned that. > 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. Yes, somebody (I think it was Julian again) said that. Note that some BIOSes are sneaky and check anyway, and refuse to take "no" for an answer. 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
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?19990519104425.S89091>