Date: Fri, 12 Apr 2002 12:13:26 -0500 (CDT) From: Chris Dillon <cdillon@wolves.k12.mo.us> To: David Drum <david@mu.org> Cc: FreeBSD DB List <freebsd-database@FreeBSD.ORG> Subject: Re: Raid configuration Message-ID: <20020412120947.Q48494-100000@mail.wolves.k12.mo.us> In-Reply-To: <20020411235022.GA21045@elvis.mu.org>
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On Thu, 11 Apr 2002, David Drum wrote: > Quoth Jim C. Nasby: > > > FWIW, RAID10 is not two seperate mirrors, it's a single volume. It's > > either a mirror of two striped volumes (yuck), or a stripe of mirrored > > volumes. > > The first description you give is RAID 0+1, the second is RAID 1+0. > There is a difference. If a disk goes bad in a RAID 0+1, you've lost an > entire mirror, because the whole stripe is gone. If a disk goes bad in > a RAID 1+0, you've only lost one mirrored drive, and not a whole stripe. And when you only have a four-drive configuration, it makes no difference which one you use since the chances of a total failure is exactly the same either way. Any more drives than that and you definately want RAID10. :-) -- Chris Dillon - cdillon@wolves.k12.mo.us - cdillon@inter-linc.net FreeBSD: The fastest and most stable server OS on the planet - Available for IA32 (Intel x86) and Alpha architectures - IA64, PowerPC, UltraSPARC, and ARM architectures under development - http://www.freebsd.org To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-database" in the body of the message
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