[Crowbar] disk management and partitioning concepts

[Dae Woo]

Hello,

it is very interesting how crowbar is doing partitioning and disk
management. I'm guessing that it can configure RAID on the unallocated
nodes with the help of proprietary barclamp.

Is the configured RAID storage visible to the operating system as only one
existing disk?

Anyway, for ubuntu distros crowbar is using preseed with the atomic
partitioning scheme with LVM. It uses the whole disk /dev/sda and creates
only 2 volume groups: for root and a swap. But if we have some more disks,
e.g. /dev/sdb, /dev/sdc, it leaves them untouched at all.

In fact crowbar has no any adjustable method to perform the disk/'logical
volume' management and partitioning.

My suggestion is to perform this management step during the operating
system installation.
Sledgehammer will provide all information about every unallocated node
during the discovery state by ohai. And then when a specific proposal is
being applied barclamp-provisioner can adjust preseed configuration to make
some logical volume management and partitioning. This disk configuration is
depends on the actual role assigned to the node.

Do you have any future plans/ideas/thoughts on this?



Many thanks!
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