Date: Wed, 6 May 2009 08:20:25 +0200 (CEST) From: Wojciech Puchar <wojtek@wojtek.tensor.gdynia.pl> To: Yuri <yuri@rawbw.com> Cc: freebsd-questions@freebsd.org Subject: Re: What is the highest hard drive read/write speed you were able to achieve by entire disk mirroring or striping? Message-ID: <alpine.BSF.2.00.0905060818230.28367@wojtek.tensor.gdynia.pl> In-Reply-To: <4A00B3FA.5050905@rawbw.com> References: <4A00B3FA.5050905@rawbw.com>
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> I am seeing 85MB/s as a speed of a single Hitachi 1TB HD. > How high can you go by mirroring or striping 2, 3, 4 harddrives? mirroring - the same, just with 2 processes reading both can get the bandwidth. make sure you use -s high enough (like 1048576) doing gmirror label stripping - the same, or 2,3,4 times, depends how you configure. for highest transfer and lowest concurrency (you mostly read huge files with one process) - use small stripe size. for lowest transfer (=1 disk) and highest concurency - use very huge stripe size like 512MB, so simply different process reading different things can hit different drives, but each I/O isn't spread.
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