[Bug 571018] Re: lucid partitioner creates unusable disk space when creating software raid arrays

[Tuomas Heino]

Disk space is allocated in megabyte-sized chunks for performance
reasons.

That implies that there will be sub-megabyte areas of unused space
between partition table and partitions and at the end of disk as well.
Similar to the partition tables, raid and encryption both have metadata
which imply further alignment requirements.

For whatever it is worth, I find those "unusable" things in partman to
be illustrative, but yes they can be confusing for the novice user. As
such, we could consider showing them only when the installer was started
in "expert mode".

<offtopic extension="note">
Would (even single-disk) partitionable raid1 by default make sense? I find such rather useful for VMs that can be booted both on bare HW and in VM, since raid1->gpt->data (inside VM) is about as easy for the bootloaders as gpt->raid1->gpt->data (on bare HW).
</offtopic>

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https://bugs.launchpad.net/bugs/571018

Title:
  lucid partitioner creates unusable disk space when creating software
  raid arrays

Status in “partman-base” package in Ubuntu:
  Triaged

Bug description:
  Binary package hint: partman-base

  When creating a raid array (with alternate cd or server cd) the lucid partitioner creates some small unusable disk space for each partition. I have not seen this in previous releases.
  See attached screen shot for more information.

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