Date: Wed, 11 Jul 2012 11:25:49 -0500 (CDT) From: Bob Friesenhahn <bfriesen@simple.dallas.tx.us> To: Jason Usher <jusher71@yahoo.com> Cc: freebsd-fs@freebsd.org Subject: Re: vdev/pool math with combined raidzX vdevs... Message-ID: <alpine.GSO.2.01.1207111121480.14450@freddy.simplesystems.org> In-Reply-To: <1342020754.79202.YahooMailClassic@web122502.mail.ne1.yahoo.com> References: <1342020754.79202.YahooMailClassic@web122502.mail.ne1.yahoo.com>
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On Wed, 11 Jul 2012, Jason Usher wrote: > > I'm not going to beat this to death, but just to summarize, if F is > 2, then the corresponding data loss probabilities for RAID-Z1, -Z2, > -Z3 are: 14.9%, 1.3%, and 0.086%. I am not sure what the above percentages mean. Regardless, I do agree that drive size is a factor in vdev reliability (MTTDL). Huge drives lessen reliability due to increased recovery time and placing more data at risk. There may be a cap on the maximum size of "enterprise" drives since "enterprise" drives are normally targeted for RAID applications. Bob -- Bob Friesenhahn bfriesen@simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/ GraphicsMagick Maintainer, http://www.GraphicsMagick.org/
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