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Old 03-08-2012, 06:16 PM   #1
duderonomy
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Registered: Apr 2008
Posts: 2

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how to remove disk partition metadata for /dev/mapper/ddf1_*


Hello,

I rcv'd a new server from a vendor. When I try to install
RHEL 5.5 via DVD.. I get to the disk partitioning screen
and see nothing but two (relatively) small partitions with
names like:
/dev/mapper/ddf1_*

I want to access the normal DOS partition on the disks.
/dev/sda1
/dev/sda2
and so on...

What is best way to remove the metadata, which is likely
causing the RHEL installer to present the drives as a RAID.
I dunno what I am going to do with a 7GB RAID mirror
when I have 2 x 2 TB available.

Is it likely that the system integrator (vendor) configured the
drives with a hardware RAID controller but then removed the
controller before we got the box? Or maybe these drives were
pulled from such box and inserted into my box without a
controller?

In any event, I am merely trying to delete this metadata.
I imagine a long dd write would work however I would
like to know the proper way.

Cheers!
 
Old 03-09-2012, 12:02 AM   #2
nigelc
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Registered: Oct 2004
Location: Sydney, Australia
Distribution: Mageia 6
Posts: 366
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Hello,
Can you post the results of /sbin/fdisk -l

cheers
 
Old 03-09-2012, 03:22 PM   #3
duderonomy
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Registered: Apr 2008
Posts: 2

Original Poster
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well... that data is already blown away. I can tell you about it.
when I ran sfdisk --list` it would show 4 primary partitions of 0 size
I believe their may have also been a comment about Linux Mapper or something indicating that.
Then when I went into fdisk and p(rint) the status, it would show no partitions.

dmraid would recognize the special paritions with the /dev label mentioned previously.
However for some reason `dmraid -eE` returned errors... perhaps because I had already
mucked with the partitions and broke them while using fdisk (attempting to delete things
partitions that I did not understand)

so finally I just dd the entire disk with zero.

Now, when I run the RHEL installer, I can see raw devices.
Success.

Cheers!
 
  


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