Date: Mon, 07 Apr 2008 00:03:08 +0200 From: Miroslav Lachman <000.fbsd@quip.cz> To: freebsd-geom@freebsd.org Cc: Ferruccio Zamuner <nonsolosoft@diff.org> Subject: Re: gmirror on a very slow but new HP architecture Message-ID: <47F9489C.7040602@quip.cz> In-Reply-To: <47F92BD9.1060207@diff.org> References: <47F92BD9.1060207@diff.org>
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Ferruccio Zamuner wrote: > on FreeBSD 6 and gmirror usually I get 50-60Mb/s with a pair PATA hds, > speed higher than 130Mb/s with gstripe on the same 2 hds. > > Two weeks ago I've installed the new FreeBSD 7 on a brand new HP > Proliant ML110 (G4): > [...] > 2) Here are instead catastrophic access speed on single drive: > > free# swapoff /dev/da0s1b > free# dd if=/dev/zero of=/dev/da0s1b bs=8192 count=30000 > 30000+0 records in > 30000+0 records out > 245760000 bytes transferred in 254.051957 secs (967361 bytes/sec) > > Look! Lower than 1Mb/s > > Then I try to do the same write on the gmirror on da1,da2,da3 without > soft-update but with journaling: > > free# dd if=/dev/zero of=/home1/test bs=8192 count=30000 > 30000+0 records in > 30000+0 records out > 245760000 bytes transferred in 68.658723 secs (3579443 bytes/sec) > > It's about 3.5Mb/s [...] > I'll be glad for any info to make FreeBSD 7 to run faster than actually > on this machine. Did you tried the same dd test with another OS (with some bootable live CD of Linux)? It may be caused by bad disk controller / bad cables. Miroslav Lachman
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