improve partition wipe

[Andrew Woodward]

Hi all,

I have 2 cents to add in pre-script in a kickstart file.
Instead of using dd if=/dev/zero of=/dev/sda bs=1M count=10
we can use the following commands:
# sgdisk --zap-all /dev/sda
# parted -s /dev/sda mklabel gpt

from man sgdisk: Zap (destroy) the GPT and MBR data structures and then exit. This option works much like -z, but as it wipes the MBR as well as the GPT, it's more suitable if you want to repartition a disk after using this option

from man parted: mklabel Create a new disklabel (partition table) of label-type.
Thank you.

Best Regards,
Aleksandr Dobdin.
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As I understand, we will simply modify a couple of lines in a file https://github.com/stackforge/fuel-library/blob/master/deployment/puppet/cobbler/templates/scripts/pmanager.py

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We should also check the wipe task that astute does

[Mike Scherbakov (mihgen)]

Source of the info for ticket: http://<email address hidden>/msg00662.html

[Vladimir Sharshov (vsharshov)]

Should we use such commands for erase_node task instead of 'dd if=/dev/zero of=/dev/sda bs=1M count=10'?

[Andrew Woodward (xarses)]

@vsharshov, I think so

[Andrew Woodward (xarses)]

After discussion we have determined that the sgdisk command doesn't do anything more than what the dd does, and does nothing to avoid issues we have with dd. At this time since we have a known track record with dd, we have opted to keep using dd