Date: Tue, 17 Oct 2000 15:10:30 -0700 From: Mike Smith <msmith@freebsd.org> To: Gerhard Sittig <Gerhard.Sittig@gmx.net> Cc: freebsd-stable@FreeBSD.ORG Subject: Re: PERC2 RAID support in 4.1-STABLE Message-ID: <200010172210.e9HMAUh00566@mass.osd.bsdi.com> In-Reply-To: Your message of "Tue, 17 Oct 2000 20:03:18 %2B0200." <20001017200318.E25237@speedy.gsinet>
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> > Its a shorter PCI card than the others, single channel, SCSI
> > LVD. It has OK performance. I am currently using it in a
> > RAID0+1 type config.
>
> Where can I learn more about the pitfalls? I have a model 466
> waiting to get employed (RAID5 config with three IBM drives) and
> get very poor throughput in the 3MB/s range. I'm aware of the
> expensive directory manipulations but even "dd if=/dev/zero
> of=$FILE bs=8388608 count=..." is this slow and I don't know
> where to start searching. This has been with 4.0-R and 4.1-R,
> cvsup to -STABLE has just finished and results will be available
> soon.
The IBM drives I have play very poorly in RAID configurations. Having
said that, you will want to enable write caching on both the drives and
the controller for best performance. You'll also want to use the
"DirectIO" option on the array.
--
... every activity meets with opposition, everyone who acts has his
rivals and unfortunately opponents also. But not because people want
to be opponents, rather because the tasks and relationships force
people to take different points of view. [Dr. Fritz Todt]
V I C T O R Y N O T V E N G E A N C E
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