Date: Wed, 7 Oct 1998 14:27:54 -0600 (MDT) From: "Justin T. Gibbs" <gibbs@narnia.plutotech.com> To: Osma Ahvenlampi <oa@spray.fi> Cc: aic7xxx@FreeBSD.ORG Subject: Re: Synchronous/Asynchronous and Disconnect/Connect? Message-ID: <199810072027.OAA12427@narnia.plutotech.com> In-Reply-To: <01BDF175.B29F64A0.paul@nailed.demon.co.uk> <19981007081601.A25700@tiktok.cygnus.com> <m3r9wkgr55.fsf@ws142.spray.fi>
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> Well, in benchmarks ran on Beowulf data servers (I've seen the results > somewhere on beowulf.org, although now I can find data only for IDE > disks), it became pretty apparent that more than 3 disks per > controller, and the sustained speed flattened significantly before the > theoretical maximum bus capacity. 4 Cheetahs on the same bus probably > won't get you 40 MB/s, while the same drives on two Ultra-Wide > controllers probably would surpass 40MB/s aggregate speed in a fast > machine. 4 Cheetah(2) drives on a single LVD segment yields ~60MB/s. I'd need another drive to determine where the bus actually saturates since I'm bumping into plater speeds right now. -- Justin To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-aic7xxx" in the body of the message
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