Date: Fri, 16 Sep 2005 14:30:12 +0700 From: Victor Sudakov <sudakov@sibptus.tomsk.ru> To: freebsd-geom@freebsd.org Subject: Create a mirror on disk with valid data Message-ID: <20050916073012.GA31056@admin.sibptus.tomsk.ru>
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Colleagues, gmirror(8) says that a mirror can be created from a disk with existing data. However, other sources like http://ezine.daemonnews.org/200502/diskmirror.html say that the mirror device should be first partitioned, labelled and formatted. The second way seems to me more feasible. From experimenting with different disks I have found out that (according to fdisk) the size of gm0 is several sectors smaller than that of ad0. I said to myself, that is the overhead of the gmirror metadata. How could it then be possible to create a mirror from a disk with existing data, like the man page suggests? The gmirror metadata could then be overwritten with user data or vice versa. Any input is very much appreciated. -- Victor Sudakov, VAS4-RIPE, VAS47-RIPN
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