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Date: Fri, 10 Sep 2004 15:06:56 +0200
From: =?ISO-8859-1?Q?S=F8ren_Schmidt?= <sos@DeepCore.dk>
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To: Frode Nordahl <frode@nordahl.net>
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cc: current@freebsd.org
Subject: Re: Promise PDC20267 ATA RAID, poor write performance
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Frode Nordahl wrote:
> Hello,
>=20
> I have a intel S845WD1-E board with onboard Promise PDC20267 controller=
=2E
> 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.
>=20
> Disks connected:
> ad4: 39205MB <Maxtor 6E040L0/NAR61590> [79656/16/63] at ata2-master UDM=
A100
> ad6: 39205MB <Maxtor 6E040L0/NAR61590> [79656/16/63] at ata3-master UDM=
A100
>=20
> I have them set up in a RAID1
>=20
> I have tried this on FreeBSD 4.10-RELEASE, and 6-CURRENT (from today)=20
> with similar results.
>=20
> I also tried with RAID0, and that showed the same results*2, that is,=20
> ca. 7MB/s write instead of 3.5MB/s.

Hmm that is "somewhat" on the low side, even with those Maxtors it=20
should be better.

I'll try to reproduce here, I should have semilar or even identical HW=20
in the ATA collection in the lab, give me a few days to get it setup...

-S=F8ren