Date: Thu, 12 Jun 2008 10:22:25 +0200 From: "DA Forsyth" <iwrtech@iwr.ru.ac.za> To: freebsd-questions@freebsd.org Subject: Re: xRAID disks.... Message-ID: <4850F8E1.11972.4CF6D470@iwrtech.iwr.ru.ac.za> In-Reply-To: <4850EB8B.12487.4CC2C0F4@iwrtech.iwr.ru.ac.za> References: <484EACEB.7169.43FE1258@iwrtech.iwr.ru.ac.za>, <20080610145926.GA66984@owl.midgard.homeip.net>, <4850EB8B.12487.4CC2C0F4@iwrtech.iwr.ru.ac.za>
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On 12 Jun 2008 , DA Forsyth entreated about
"Re: xRAID disks....":
> hmmm, thinking now the gmirror create/remove route will probably
> work. let me try it on a blankish disk and see....
this appears to be the answer to the question:
how to stop ar recognizing a disk that used to be on a raid
controller
doing a 'gmirror label gm0 /dev/ad1' filled the last sector with
data, and 'gmirror clear /dev/ad1' reset it all to zero
now to try it on the big disk with data on it...
YES: it works, and the data slice is still there, and the commands
happen a lot faster than a dd with a skip parameter
sidenote: to see the last sector use sysinstall's fdisk to see the
data for the disk. you'll see something like
Disk name: ad3 FDISK
Geometry: 38913 cyls/255 heads/63 sectors = 625137345 sectors
Offset Size(ST) End Name PType Desc Subtype
0 63 62 - 12 unused 0
63 625137282 625137344 ad3s1 8 freebsd 165
625137345 5103 625142447 - 12 unused 0
^^^^^^^^^
you want that number in a dd commmand like this
dd if=/dev/ad3 skip=625142447 | hd -v
Thanks to all for the pointers
--
DA Fo rsyth Network Supervisor
Principal Technical Officer -- Institute for Water Research
http://www.ru.ac.za/institutes/iwr/
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