Date: Wed, 30 Jan 2013 15:42:25 +0400 From: Artem Kuchin <matrix@itlegion.ru> To: Warren Block <wblock@wonkity.com> Cc: freebsd-questions@freebsd.org Subject: Re: Software raid VS hardware raid Message-ID: <51090721.2010606@itlegion.ru> In-Reply-To: <alpine.BSF.2.00.1301291353570.30931@wonkity.com> 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>
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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. > >> Or maybe there is a way to instruct gmirror do rebuild only what i >> say (manual rebuild) ? > > 'gmirror configure -n' ? Have not tried it. The trick would be to do > that before multiple mirrors start rebuilding, which they will as soon > as geom_mirror.ko is loaded. > As i understand from the man page -n setup the device not to auto rebuild ever. So, this is probably the thing i want. I need to setup a test system and play with it a bit. Artem
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