Date: Wed, 30 Aug 2017 11:56:42 -0300 From: Mikhail Goriachev <mikhailg@webanoide.org> To: freebsd-questions@freebsd.org Subject: Re: help creating new gmirror > 2TB Message-ID: <2eeddc7e-e5ba-5a57-b40f-2cd4ca892494@webanoide.org> In-Reply-To: <CAFsnNZLeuLYEJVozsoSvDtvgfMf4UueJhm37waOQ5_kyxs-rhg@mail.gmail.com> References: <CAFsnNZLeuLYEJVozsoSvDtvgfMf4UueJhm37waOQ5_kyxs-rhg@mail.gmail.com>
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On 29/08/2017 17:12, William Dudley wrote: > Hi, > > I want to create a simple mirror > 2TB on a FreeBSD 10.3 system. > > I have 2 identical 4TB disks. > > The examples in freebsd handbook "geom-mirror" pages show creation of a 2TB > mirror using > MBR partitioning, and that has an upper limit of 2TB. > > Some documentation says not to use GPT partitioning with gmirror because > both store their information in the last sector on the disk. > > I'm not expert enough to be able to solve this myself. > > How do I create a gmirror of 4TB size? > > I want to partition it into 4 slices after I create it, but think I can use > gpart to do that. > > Note: I'm not interested in using zfs unless there's no way to do this with > gmirror. > I read too many zfs failure stories on this mailing list to be comfortable > with zfs. > > Thanks in advance, > Bill Dudley Hi Bill, Great articles that helped me a lot back awhile: http://www.wonkity.com/~wblock/docs/html/disksetup.html http://www.wonkity.com/~wblock/docs/html/gmirror.html In regard with disk thrashing, just mirror one essential partition. IMO thrashing isn't that bad if it happens once or twice a year... but it takes a long time and the disks go nuts. GPT is the way to go in your situation. Cheers, Mikhail. -- Mikhail Goriachev Webanoide
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