Date: Fri, 20 Oct 2000 09:29:04 -0400 From: Mike Tancsa <mike@sentex.net> To: "Jose M. Alcaide" <jose@we.lc.ehu.es> Cc: freebsd-stable@FreeBSD.ORG Subject: Re: vinum and ATA-66 (was: Via KT133 chipset and DMA diskaccess) Message-ID: <5.0.0.25.0.20001020092604.06a99d30@marble.sentex.ca> In-Reply-To: <39F04821.BA400C50@we.lc.ehu.es> References: <E13lWjn-000LqP-00@post.mail.nl.demon.net> <39EC7AAA.642D480@we.lc.ehu.es> <20001017200216.D1250@sydney.worldwide.lemis.com>
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At 03:26 PM 10/20/00 +0200, Jose M. Alcaide wrote:
>I read the ata(4) man page and indeed it says that mixing UDMA4 and
>non-UDMA4 devices on the same ATA channel is not recommended. Obviously
>I bumped into this problem.
>
>BTW, I plan to purchase a Promise Ultra66 controller for connecting
>four ATA-66 disks and configuring a RAID-5 device using Vinum (4.1.1-STABLE).
>Greg, What do you think about this configuration? Should it perform well?
>The machine has a Pentium Pro 180 CPU and the 440FX chipset. I want to
>use it for setting up yet another FreeBSD mirror.
There is differences in performance. Here is a rawio test with 2 masters
and a master slave
Random read Sequential read Random write Sequential write
ID K/sec /sec K/sec /sec K/sec /sec K/sec /sec
vinum0 1369.0 85 7067.9 431 3254.2 199 6234.9 381
vinum0 2525.8 157 10657.7 650 3278.1 204 14671.6 895
using the promise in ATA66 mode (i.e. proper cables etc) on a pair of
Quantum fireballs.
---Mike
------------------------------------------------------------------------
Mike Tancsa, tel +1 519 651 3400
Sentex Communications mike@sentex.net
Cambridge, Ontario Canada www.sentex.net
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