Date: Tue, 29 Jan 2013 07:57:31 -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.2.00.1301290749460.27370@wonkity.com> In-Reply-To: <5107A500.4030902@itlegion.ru> References: <5106E301.4070707@itlegion.ru> <ke7v7a$r0d$1@ger.gmane.org> <5107A500.4030902@itlegion.ru>
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On Tue, 29 Jan 2013, Artem Kuchin wrote: > My other concern is what happens when one drive goes down if we use gmirror? > Is it completelly transparent > and bad drive can be hot swapped while server is running and rebuild started? > I am thinking now about gpt+gmirror (including boot and swap) As far a gmirror is concerned, yes, drives can be removed and new drives inserted while the mirror is running. Hot swap is more of an issue with the hardware. I have not tried it with SATA drives, although I think it should work. 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
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