Date: Sat, 14 May 2005 11:33:38 -0400 From: David Magda <dmagda@ee.ryerson.ca> To: Pawel Jakub Dawidek <pjd@freebsd.org> Cc: freebsd-stable@freebsd.org Subject: Re: gmirror Message-ID: <1fd5b5ac2af3d7efffb5b1c473b76fb0@ee.ryerson.ca> In-Reply-To: <20050514131648.GB837@darkness.comp.waw.pl> References: <20050514093217.C6088E082A@oak.tantieme.ru> <20050514131648.GB837@darkness.comp.waw.pl>
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On May 14, 2005, at 09:16, Pawel Jakub Dawidek 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; The following paper describes the I/O characteristics of various RAID schemes: http://citeseer.ist.psu.edu/chen89evaluation.html The following two may also be of some interest: http://citeseer.ist.psu.edu/chen90maximizing.html http://citeseer.ist.psu.edu/219910.html
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