Date: Fri, 25 Jul 2008 11:46:40 +0200 (CEST) From: Wojciech Puchar <wojtek@wojtek.tensor.gdynia.pl> To: freebsd-questions@freebsd.org Subject: graid3 Message-ID: <20080725114402.G5386@wojtek.tensor.gdynia.pl>
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i read the graid3 manual and http://www.acnc.com/04_01_03.html to make sure i know what's RAID3 and i don't understand few things. 1) "The number of components must be equal to 3, 5, 9, 17, etc. (2^n + 1)." why it can't be say 5 disks+parity? 2) "-r Use parity component for reading in round-robin fashion. "Without this option the parity component is not used at all for reading operations when the device is in a complete state. With this option specified random I/O read operations are even 40% faster , but sequential reads are slower. One cannot use this option if the -w option is also specified." how parity disk could speed up random I/O? is there any description of how graid3 actually works?
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