Date: Tue, 29 Jul 2003 13:25:32 -0400 (EDT) From: Kenneth Culver <culverk@yumyumyum.org> To: Darryl Hoar <darryl@osborne-ind.com> Cc: freebsd-questions@freebsd.org Subject: Re: Calling all raid experts Message-ID: <20030729132203.V53251@alpha.yumyumyum.org> In-Reply-To: <006901c355eb$0b914090$0701a8c0@darryl> References: <006901c355eb$0b914090$0701a8c0@darryl>
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> Greetings, > I need to build a file server for our marketing departments documents > and images. I want to use Freebsd. Since the data is large, and > backups would be difficult I was wondering if RAID would be a solution. > > I thought that RAID 5 would be the ticket, but after reading up on it, > maybe not. > > Isn't RAID 5 the one where if a disk fails, you plug a new one it and it > regenerates the lost data ? > It does that through the use of some checksum data that's spread across the disks. Reads on raid 5 can be significantly faster than single disk because data is striped across multiple disks, but writes don't get as much of a boost because for every write, there are several operations, including the recalculation of a checksum, and the writing of both the checksum and data, then a re-reading of them. Writes are usually faster than single disk writes, but the gain is not nearly as much as with reads. Ken
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