Date: Tue, 29 Jan 2013 11:02:23 -0600 From: Mark Felder <feld@feld.me> To: Artem Kuchin <matrix@itlegion.ru>, Warren Block <wblock@wonkity.com> Cc: pjd@freebsd.org, freebsd-questions@FreeBSD.org Subject: Re: Software raid VS hardware raid Message-ID: <op.wromx9ca34t2sn@markf.office.supranet.net> In-Reply-To: <alpine.BSF.2.00.1301290749460.27370@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>
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On Tue, 29 Jan 2013 08:57:31 -0600, Warren Block <wblock@wonkity.com> wrote: > 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 Why isn't gmirror more intelligent? I hate to use Linux as an example, but mdadm won't simultaneously rebuild multiple RAID sets if they use the same physical providers to prevent this. Could this be added as a feature? Even a sysctl toggle?
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