Date: Tue, 19 Oct 2004 14:40:24 +0000 From: Josh Paetzel <josh@tcbug.org> To: freebsd-isp@freebsd.org Cc: Kristofer Pettijohn <krishopper@cybernetik.net> Subject: Re: Disk I/O Performance with CCD Message-ID: <200410191440.24864.josh@tcbug.org> In-Reply-To: <20041019192252.GB78974@cybernetik.net> References: <20041019192252.GB78974@cybernetik.net>
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On Tuesday 19 October 2004 19:22, Kristofer Pettijohn wrote: > Im looking for some suggestions on I/O performance. > > I'm using FreeBSD 4.10-RELEASE on a Usenet transit server running > Diablo for the transit software. > > I have 4 Seagate ST373435LC SCSI drives, 70GB each, and I am using > CCD to bind them together with RAID-0 stripes. > > I can pull in anywhere from 30-40 MB sec and push out ~ 8-15 > MB/sec.. averaging about 50 MB/sec throughput.. feeds coming in are > coming in just fine, but sending stuff back out is lagging behind.. > its falling about a half hour behind every hour. > Maybe I'm just missing something small, but on these SCSI drives > which have 160 MB/s transfer rates, I'm expecting a bit more than > I'm getting with CCD. > > Can someone give me any pointers to look at or suggestions of > things to try? > > Thanks! > > Kristofer I don't know if this helps you out or not, but U160 drives have a 160Meg/sec bus, not the ability to stream data at 160Megs/sec Thanks, Josh Paetzel
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