clear metadata using dd?

[Pawel Jakub Dawidek]

On Tue, Jan 09, 2007 at 10:24:04AM -0300, Fernan Aguero wrote:
> On 1/9/07, Pawel Jakub Dawidek <pjd at freebsd.org> wrote:
> >On Mon, Jan 08, 2007 at 11:13:15PM -0300, Fernan Aguero wrote:
> >> On 1/8/07, Gary Palmer <gpalmer at freebsd.org> wrote:
> >> >On Mon, Jan 08, 2007 at 07:45:06PM -0300, Fernan Aguero wrote:
> >>
> >> [snipped]
> >>
> >> >> 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.
> >>
> >> [snipped]
> >>
> >> >Any reason that "gstripe clear" or "gmirror clear" doesn't work?  Thats what
> >> >they're meant to do, as far as I know.
> >>
> >> because ad4s3 is no longer part of gm0?
> >
> >You get "Operation not permitted." because someone already keep ad4s3
> >open for writing. Could you send output of 'sysctl -b kern.geom.confxml'
> >so we can find out who?
> 
> http://omega.iib.unsam.edu.ar/kern.geom.confxml
[...]

In this output size of ad4 is 160041885696 bytes.

In your first post, slices are configured this way:

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

If ad4s3 starts at 146795292 sectors and is 188742708 sectors big, which
bascially means, that ad4s3 end at offset:

	(146795292+188742708)*512 = 171795456000 bytes

160041885696 < 171795456000, which means your slices are misconfigured.
Correct that and it should work.

> And also, why does the GEOM config contain information for devices that are not
> managed by geom? My da0 and swap devices (ad4s1b, ad6s1b) are not geom
> based ...

Every single storage provider in FreeBSD is managed by GEOM.

-- 
Pawel Jakub Dawidek                       http://www.wheel.pl
pjd at FreeBSD.org                           http://www.FreeBSD.org
FreeBSD committer                         Am I Evil? Yes, I Am!
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