Date: 3 Feb 1999 17:33:06 +1100 From: "John Saunders" <john.saunders@nlc.net.au> To: freebsd-questions@FreeBSD.ORG Subject: Re: advice on setting up a Vinum volume Message-ID: <19990203063306.27822.qmail@nhj.nlc.net.au> In-Reply-To: <19990203073254.C1179@freebie.lemis.com>
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In nlc.lists.freebsd-questions you wrote:
> On Tuesday, 2 February 1999 at 11:48:15 -0600, Glenn Johnson wrote:
>> When you say performance should be acceptable, does that imply that
>> performance would be better if I didn't use a Vinum striped volume? I
>> was considering using the striped volume for /usr/obj and /usr/ports.
> I'd expect the performance of a striped volume to be better than for a
> non-striped volume *for multiple concurrent access*. What you do on
> /usr/obj and /usr/ports doesn't normally fit that model. I wouldn't
> expect much difference like in this case.
Sustained performance is much better. On my pair of Quantum 6.4GB drives
they get approx 7MB/s sustained (dd if=/dev/zero of=file bs=262144
count=1024). With a vinum strip of 256K in size I get sustained
12.5MB/s. Running squid on this setup I can watch the load being
distributed by running (systat -iostat 1) although vinum stats show
that one drive seems to be used about 20% more than the other.
Cheers.
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