Date: Sun, 30 Mar 2003 18:21:15 +0200 (CEST) From: Lukas Ertl <l.ertl@univie.ac.at> To: Dag-Erling =?iso-8859-1?q?Sm=F8rgrav?= <des@ofug.org> Cc: freebsd-stable@freebsd.org Subject: Re: vinum performance Message-ID: <20030330181947.B23911@leelou.in.tern> In-Reply-To: <xzp8yuwj0o0.fsf@flood.ping.uio.no> References: <20030330125138.K23911@leelou.in.tern> <xzpk7ehhxaf.fsf@flood.ping.uio.no> <xzpbrzthqpy.fsf@flood.ping.uio.no> <xzp8yuwj0o0.fsf@flood.ping.uio.no>
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On Sun, 30 Mar 2003, Dag-Erling Sm=F8rgrav wrote: > Lukas Ertl <l.ertl@univie.ac.at> writes: > > I'm currently testing with prime stripe sizes, but it doesn't seem to > > help. I additionally added "options AHC_ALLOW_MEMIO" to the kernel, and= it > > has raised write performance in the single-disk case (although I'm not > > happy with that one either; I expected a disk on a U160 controller to p= ump > > out more than ~65MB/s). > > Does the data sheet for your disk indicate that it can in fact write > much faster than that? Well, the HP/Compaq webpages are full of marketing speech wrt that, but since these disks are U320 disks, they should perform better I think. > The speed at which data is actually written to the media is much lower > than the bus speed - the bus speed *has* to be higher to accomodate > multiple devices. Ok, that's reasonable. best regards, le --=20 Lukas Ertl eMail: l.ertl@univie.ac.at UNIX-Systemadministrator Tel.: (+43 1) 4277-14073 Zentraler Informatikdienst (ZID) Fax.: (+43 1) 4277-9140 der Universit=E4t Wien http://mailbox.univie.ac.at/~le/
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