Date: Sun, 27 Jul 2008 20:59:20 +0200 (CEST) From: Wojciech Puchar <wojtek@wojtek.tensor.gdynia.pl> To: Ivan Voras <ivoras@freebsd.org> Cc: freebsd-questions@freebsd.org Subject: Re: graid3 Message-ID: <20080727205835.Y33967@wojtek.tensor.gdynia.pl> In-Reply-To: <g6gh2a$a7m$1@ger.gmane.org> References: <20080725114402.G5386@wojtek.tensor.gdynia.pl> <g6gh2a$a7m$1@ger.gmane.org>
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>> why it can't be say 5 disks+parity? > > The reason is in the definition on "RAID 3", which says the updates to the > RAID device must be atomic. In some ideal universe, RAID 3 is implemented in > hardware and on individual bytes, but here we cannot write to the drives in > units other than sectorsize and sectorsize is 512 bytes. OK i understand - the RAID sectors must be 2^something, so amount of drives must be 2^something+1. thanks
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