Date: Sun, 16 Jan 2005 14:14:14 -0600 From: Doug Poland <doug@polands.org> To: questions@freebsd.org Subject: gmirror: replacing failed disks Message-ID: <20050116201414.GA76014@polands.org>
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Hello, I've got a bootable gmirror running on identical SATA drives on 5.3-STABLE. The technique I've used to build the gmirror can be found on http://people.freebsd.org/~rse/gmirror, under the heading "GEOM mirror Approach 2: Single Slice, Preferred, More Flexible". Now I'd like to experiment with replacing a "failed" drive. This particular box has hot-swappable drives, so all I need to do is pull a drive out while the box is running. The man page states: One disk failed. Replace it with a brand new one: gmirror forget data gmirror insert data da1 (My system has a provider gm0s1 with ad4 and ad6 as consumers, so I'll use those device names) Simulate ad4 failing: pull the drive put the drive back in, reboot if necessary to detect drive # gmirror forget gm0s1 # dd if=/dev/zero of=/dev/ad4 bs=512 count=79 # size=`fdisk ad6 | grep ', size ' | head -1 | sed -e 's;^.*size \([0-9]*\).*$;\1;'` (echo "p 1 165 63 $size"; echo "a 1") | fdisk -v -B -f- -i /dev/ad4 OR # fdisk -v -B -I /dev/ad4 # gmirror insert gm0s1 /dev/ad4s1 (Now wait two hours for the drives synchronize) That should work, yes? How does gmirror know about /dev/ad4s1 if that drive was previously unformatted or brand new? -- Regards, Doug
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