Date: Mon, 8 Jan 2007 19:45:06 -0300 From: "Fernan Aguero" <fernan.aguero@gmail.com> To: geom@freebsd.org Subject: clear metadata using dd? Message-ID: <520894aa0701081445i43d76098m418ce695d2133e53@mail.gmail.com>
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Hi I'm trying to set up two disks to contain both gmirrored and gstriped slices. This is what I'm trying to achieve: adxs1, swap adxs2, gmirror adxs3, gstripe I already got the first and second slices set up (swap and gmirror containing the active, root partition), but I cannot seem to be able to set up s3 into a gstripped device. gama# gstripe label -v gs0 /dev/ad4s3 /dev/ad6s3 Can't store metadata on /dev/ad4s3: Operation not permitted. This might be because ad4s3 had been part of a gmirror device before I reorganized my disks and moved the mirror to the s2 slice. Gayn Winters suggested that: "The geom metadata is stored in the last block of the slice. Zero it as well and you can have a clean start." http://lists.freebsd.org/pipermail/freebsd-questions/2006-May/120950.html But now I wonder what is the magic incantation to run dd for targeting the last (sector?) of ad4s3? I imagine I have to use something like dd if=/dev/zero of=/dev/ad4s3? bs=512 count=1 but adding either skip=? or seek=? to taste. gama# fdisk -s /dev/ad4 /dev/ad4: 310101 cyl 16 hd 63 sec Part Start Size Type Flags 1: 63 16771041 0xa5 0x00 2: 16771923 146795229 0xa5 0x80 3: 146795292 188742708 0xa5 0x00 maybe I should skip (146795292 + 188742708 - 1) sectors? Fernan -- Fernan Aguero
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