Date: Mon, 2 Dec 2013 08:56:13 -0700 (MST) From: Warren Block <wblock@wonkity.com> To: Julien Cigar <jcigar@ulb.ac.be> Cc: "Mike." <the.lists@mgm51.com>, freebsd-questions@freebsd.org Subject: Re: gmirror, gpart and MBR vs GPT in the Handbook Message-ID: <alpine.BSF.2.00.1312020847510.14007@wonkity.com> In-Reply-To: <20131202103122.GN66981@mordor.lan> References: <201311301303210813.05DE187E@smtp.24cl.home> <alpine.BSF.2.00.1311301352140.99113@wonkity.com> <201312011121580096.005D00FB@smtp.24cl.home> <20131202103122.GN66981@mordor.lan>
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On Mon, 2 Dec 2013, Julien Cigar wrote: > If you want to use GPT with gmirror you may want to mirror each > partition instead of the whole disk. > > For example on my box I have the following: https://dpaste.de/Rb3S There are a couple of potential problems with that. The big one is when a disk fails and is replaced. If you're not careful, the rebuild of all those mirrored partitions will start at the same time. Head contention will bring that to a near-standstill. It also puts a heavy load on the drive that still works. Hopefully it is not the same model and age as the one that failed, or its "warranty timer" may also be close to expiring. A less-serious problem is that only the partitions are mirrored. That leaves out metadata like the partition tables and bootcode, but those typically do not change very often and might not be a problem. The admin has to remember to manually install such things on a new replacement disk, though.
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