Date: Fri, 3 Nov 2000 01:09:09 +0100 From: Ernst de Haan <ernst@jollem.com> To: Rick Jansen <Rick@Tweakers.net> Cc: freebsd-questions@freebsd.org, questions@freebsd.org Subject: Re: 15000rpm SCSI3 Ultra160Wide LVD Harddisks gets just 4769 K/sec (bonnie) Message-ID: <20001103010909.C1307@c187104187.telekabel.chello.nl> In-Reply-To: <005401c04387$82a3c230$7300a8c0@hephaistos>; from Rick@Tweakers.net on Tue, Oct 31, 2000 at 11:11:25PM %2B0100 References: <005401c04387$82a3c230$7300a8c0@hephaistos>
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Heya Rick, Perhaps `bonnie' is not very reliable when it comes to testing. I did some testing myself a while ago, and I found out that my LVD U2W disk (with the special [read: expensive] cable) was only a bit faster than my regular UDMA-33 harddisk, with a slave connected on the same cable. Ernst Rick Jansen wrote: > Hi there, > > I have a hardware RAID-5 setup, using 3 Cheetahs 18.9Gb 15000rpm. When i run > Bonnie, this is the output: > > bash-2.04$ bonnie > File './Bonnie.248', size: 104857600 > Writing with putc()...done > Rewriting...done > Writing intelligently...done > Reading with getc()...done > Reading intelligently...done > Seeker 1...Seeker 2...Seeker 3...start 'em...done...done...done... > -------Sequential Output-------- ---Sequential > Input-- --Random-- > -Per Char- --Block--- -Rewrite-- -Per > Char- --Block--- --Seeks--- > Machine MB K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU /sec > %CPU > 100 4769 13.4 4814 4.1 5767 5.7 24421 > 100.0 239718 96.4 31833.2 199.6 > bash-2.04$ > > This seems really bad to me, on a "normal" system i get measurements maybe 8 > higher then this. What could be causing this? No use of DMA? How can i see > whether it's using DMA? And how do i enable it? > The SCSI Caching Raid controller is an Adaptec 2100s. Also, the creation of > the 35Gb Raid array took 4 hours to complete. The server is going to be a > database server. > Could somebody please tell me what's going on? > > Rick Jansen > ************** > Server Administrator [Linux - FreeBSD] > www.tweakers.net - www.fokzine.net > E-Mail: Rick@Shellz.nl - Rick@Tweakers.net > ICQ: 37416519 > Get Your Free Shell account @ www.shellz.nl now! > ************** > > > > To Unsubscribe: send mail to majordomo@FreeBSD.org > with "unsubscribe freebsd-questions" in the body of the message > To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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