Date: Wed, 30 Jan 2013 07:06:45 -0700 (MST) From: Warren Block <wblock@wonkity.com> To: Artem Kuchin <matrix@itlegion.ru> Cc: freebsd-questions@freebsd.org Subject: Re: Software raid VS hardware raid Message-ID: <alpine.BSF.2.00.1301300635130.37822@wonkity.com> In-Reply-To: <51090721.2010606@itlegion.ru> References: <5106E301.4070707@itlegion.ru> <ke7v7a$r0d$1@ger.gmane.org> <5107A500.4030902@itlegion.ru> <alpine.BSF.2.00.1301290749460.27370@wonkity.com> <5107FC3C.4030701@itlegion.ru> <alpine.BSF.2.00.1301291353570.30931@wonkity.com> <51090721.2010606@itlegion.ru>
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On Wed, 30 Jan 2013, Artem Kuchin wrote: > > 30.01.2013 1:01, Warren Block: >> On Tue, 29 Jan 2013, Artem Kuchin wrote: >> >>> >>> 29.01.2013 18:57, Warren Block: >>>> On Tue, 29 Jan 2013, Artem Kuchin wrote: >>>> >>>> The Handbook chapter on gmirror talks about the problems with GPT and >>>> GEOM metadata. In short: right now, they conflict. It's possible to >>>> mirror GPT partitions, but be aware that if you mirror more than one >>>> partition on a drive, a rebuild after replacing a drive could thrash the >>>> heads as mirrors are rebuilt simultaneously. >>>> >>>> http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/geom-mirror.html >>>> >>> >>> So, >>> gmirror+GPT=conflict on last sector >>> GPT+gmirror = hardrive head kill >>> >>> nice... >>> >>> So, for no more than 2TB disks the best way to go is GMIRROR of the drive >>> +PARTITION on top of it? >> >> GPT partitions should work, just limit it to one mirrored partition per >> drive. > > Please, clarify what you mean here. If only one GPT partition on a drive is mirrored with another GPT partition on another drive, head contention never comes up. There is only one mirror. It does nearly eliminate the usefulness of GPT partitioning.
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