Date: Tue, 3 Dec 2013 10:26:04 +0100 From: Julien Cigar <jcigar@ulb.ac.be> To: Warren Block <wblock@wonkity.com> Cc: "Mike." <the.lists@mgm51.com>, freebsd-questions@freebsd.org Subject: Re: gmirror, gpart and MBR vs GPT in the Handbook Message-ID: <20131203092604.GA86280@mordor.lan> In-Reply-To: <alpine.BSF.2.00.1312020847510.14007@wonkity.com> References: <201311301303210813.05DE187E@smtp.24cl.home> <alpine.BSF.2.00.1311301352140.99113@wonkity.com> <201312011121580096.005D00FB@smtp.24cl.home> <20131202103122.GN66981@mordor.lan> <alpine.BSF.2.00.1312020847510.14007@wonkity.com>
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On Mon, Dec 02, 2013 at 08:56:13AM -0700, Warren Block wrote: > 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. That's true, I turned off autosynchronization of stale components to avoid this kind of bad scenario .. > > 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. It's just a matter of gpart backup / gpart restore, right ? -- No trees were killed in the creation of this message. However, many electrons were terribly inconvenienced.
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