Date: Sat, 14 May 2005 18:48:47 +0400 From: Vladimir Dzhivsanoff <vohand@gmail.com> To: Pawel Jakub Dawidek <pjd@freebsd.org> Cc: freebsd-stable@freebsd.org Subject: Re: gmirror Message-ID: <4200469905051407486f241a65@mail.gmail.com> In-Reply-To: <20050514141605.GC837@darkness.comp.waw.pl> References: <20050514093217.C6088E082A@oak.tantieme.ru> <20050514131648.GB837@darkness.comp.waw.pl> <4200469905051406572de39b47@mail.gmail.com> <20050514141605.GC837@darkness.comp.waw.pl>
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On 5/14/05, Pawel Jakub Dawidek <pjd@freebsd.org> wrote: > On Sat, May 14, 2005 at 05:57:51PM +0400, Vladimir Dzhivsanoff wrote: > +> > This is the way RAID1 works. Try to imagine how disk's heads are moving > - > +> > there will be no speed-up in sequential reads, this is not RAID0. > +> > > +> > Mirror characteristics are: > +> > - the same speed for sequential reads as for one disk; > +> > - the same speed for sequential/random write as for one disk; > +> > - double speed of one disk for random reads; > +> by what test-suite I can test it ? > +> and what balance algorithm is more proper for random reads ? > > There is my tool in ports (benchmarks/raidtest/) which does what you want. > The README file wasn't moved to ports, IIRC, you can find it here: > big thanks, Pawel > http://www.freebsd.org/cgi/cvsweb.cgi/src/tools/tools/raidtest/Attic/README?rev=1.2&content-type=text/x-cvsweb-markup&hideattic=0 > > -- > Pawel Jakub Dawidek http://www.wheel.pl > pjd@FreeBSD.org http://www.FreeBSD.org > FreeBSD committer Am I Evil? Yes, I Am! > >
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