Date: Fri, 10 Sep 2004 15:06:56 +0200 From: =?ISO-8859-1?Q?S=F8ren_Schmidt?= <sos@DeepCore.dk> To: Frode Nordahl <frode@nordahl.net> Cc: current@freebsd.org Subject: Re: Promise PDC20267 ATA RAID, poor write performance Message-ID: <4141A6F0.7000009@DeepCore.dk> In-Reply-To: <EC95929E-031F-11D9-AA63-000A95A9A574@nordahl.net> References: <EC95929E-031F-11D9-AA63-000A95A9A574@nordahl.net>
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Frode Nordahl wrote: > Hello, > > I have a intel S845WD1-E board with onboard Promise PDC20267 controller. > The system is set up with a P4 2Ghz with 1GB RAM. > The board also has a Intel ICH2, but that's only used by a CDROM. > > Disks connected: > ad4: 39205MB <Maxtor 6E040L0/NAR61590> [79656/16/63] at ata2-master UDMA100 > ad6: 39205MB <Maxtor 6E040L0/NAR61590> [79656/16/63] at ata3-master UDMA100 > > I have them set up in a RAID1 > > I have tried this on FreeBSD 4.10-RELEASE, and 6-CURRENT (from today) > with similar results. > > I also tried with RAID0, and that showed the same results*2, that is, > ca. 7MB/s write instead of 3.5MB/s. Hmm that is "somewhat" on the low side, even with those Maxtors it should be better. I'll try to reproduce here, I should have semilar or even identical HW in the ATA collection in the lab, give me a few days to get it setup... -Sørenhelp
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