Date: Tue, 26 Oct 2004 00:23:29 +0200 From: Brad Knowles <brad@stop.mail-abuse.org> To: FreeBSD-CURRENT Mailing List <freebsd-current@freebsd.org> Subject: Re: FreeBSD 5.3b7and poor ata performance Message-ID: <p06002063bda32c6b2f72@[10.0.1.3]> In-Reply-To: <64029B30-26D2-11D9-9A2F-003065ABFD92@mac.com> References: <14479.1098695558@critter.freebsd.dk> <417D25E8.6080804@ng.fadesa.es> <200410251928.01536.victor@alf.dyndns.ws> <"200410251837.58257.Thoma s.Sparrev ohn"@btinternet.com> <417D3F12.20302@DeepCore.dk> <417D40A1.9030802@ng.fadesa.es> <417D45F1.9090504@freebsd.org> <77F3FD4D-26BE-11D9-9A2F-003065ABFD92@mac.com> <F5F15CA0-26C5-11D9-9A2F-003065ABFD92@mac.com> <417D65F1.2040809@freebsd.org> <p0600205fbda318006656@[10.0.1.3]> <417D6F4C.9000404@freebsd.org> <p06002061bda3224cd029@[10.0.1.3]> <64029B30-26D2-11D9-9A2F-003065ABFD92@mac.com>
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At 6:08 PM -0400 2004-10-25, Charles Swiger wrote:
>>> And when you are talking about RAID-10 with a bunch of disks, you
>>> will indeed start seeing bottlenecks in the bus.
>>
>> When you're talking about using a lot of disks, that's going to be
>> true for any disk subsystem that you're trying to get a lot of
>> performance out of.
>
> That depends on your hardware, of course. :-)
See below.
> There's a Sun E450 with ten disks over 5 SCSI channels in the room
> next door: one UW channel native on the MB, and two U160 channels
> apiece from two dual-channel cards which come with each 8-drive-bay
> extender kit.
You've got an average of two disks per SCSI channel, and how many
disks per channel on those 8-drive bays?
> It's running Solaris and DiskSuite (ODS) now, but it
> would be interesting to put FreeBSD on it and see how that does, if
> I ever get the chance.
In my experience, ODS never performed quite as good as Vinum, but
it would be very interesting to see what kind of performance you can
get out of this box using FreeBSD/SPARC64.
--
Brad Knowles, <brad@stop.mail-abuse.org>
"Those who would give up essential Liberty, to purchase a little
temporary Safety, deserve neither Liberty nor Safety."
-- Benjamin Franklin (1706-1790), reply of the Pennsylvania
Assembly to the Governor, November 11, 1755
SAGE member since 1995. See <http://www.sage.org/>; for more info.
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