Size of metadate?

Tue Jun 26 22:30:28 UTC 2007

Just found that other mail, in which diskinfo was mentioned, which
returned the following result to me:

ddna045# diskinfo -v /dev/mirror/raid1 /dev/amrd1 /dev/amrd0
/dev/mirror/raid1
   512            # sectorsize
   146814270976   # mediasize in bytes (137G)
   286746623      # mediasize in sectors

/dev/amrd1
   512            # sectorsize
   146814271488   # mediasize in bytes (137G)
   286746624      # mediasize in sectors
   17849          # Cylinders according to firmware.
   255            # Heads according to firmware.
   63             # Sectors according to firmware.

/dev/amrd0
   512            # sectorsize
   146814271488   # mediasize in bytes (137G)
   286746624      # mediasize in sectors
   17849          # Cylinders according to firmware.
   255            # Heads according to firmware.
   63             # Sectors according to firmware.

Clearing it with dd does not work:

ddna045# dd of=/dev/amrd0 if=/dev/zero bs=512 skip=286746623 count=1
dd: /dev/amrd0: Operation not permitted

The same also happens with gmirror not being loaded.

The reason why I want to clear it is because the metadata on amrd0 has
also a gmirror device named raid1, which is not in use anymore / should
be created newly:

GEOM_MIRROR: Device raid1 created (id=2125903367).
GEOM_MIRROR: Device raid1: provider amrd1 detected.
GEOM_MIRROR: Device raid1: provider amrd1 activated.
GEOM_MIRROR: Device raid1: provider mirror/raid1 launched.
GEOM_MIRROR: Device raid1 already configured.

If I boot the system with amrd0s1a as /, amrd1 is detected as
mirror/raid1.

If I boot the system with mirror/raid1sa as /, amrd0 is detected
as mirror/raid1.

Which leads me to the situation that both times I boot from amrd0.

My aim is to bootup the server from amrd1 as mirror/raid1 so I can
boot the new system found on that harddisk and after that integrate
amrd0 as the second disk into the raid.

Perhaps someone has a hint for me
   a) why the dd is not allowed to work
   b) how to clear the metadata
   c) or how to achieve my aim to make amrd1 as mirror/raid1s1a
      available as /

Sincerly

Nico

-- 
Think about Free and Open Source Software (FOSS).
http://nico.schottelius.org/documentations/foss/the-term-foss/

PGP: BFE4 C736 ABE5 406F 8F42  F7CF B8BE F92A 9885 188C
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