Adding the design decision regarding the consistency of the enabled disk
templates in the ipolicy and in the cluster config.

Signed-off-by: Helga Velroyen <helgav@google.com>
Reviewed-by: Klaus Aehlig <aehlig@google.com>

Since the design doc for storage space reporting ended up being mostly
about disk templates and storage types, and the space reporting being
just a small part of it, I am renaming the design doc.

Signed-off-by: Helga Velroyen <helgav@google.com>
Reviewed-by: Klaus Aehlig <aehlig@google.com>

This patch rewrites and extends the design doc about storage reporting
with respect to disk templates and storage types. In constrast to the
previous version, we now consider disk templates as the user-facing
entity, that the user can dis/enable for the cluster. Storage types
on the other hand describe the underlying technology used by the various
disk templates. Storage reporting will use a mapping from disk templates
to storage types to pick the correct method to report the storage for
the respective disk templates.

Note that the design doc in this state still contains some questions and
FIXMEs. Feel free to comment on those. I will complete them directly or
in future patches.

Signed-off-by: Helga Velroyen <helgav@google.com>
Reviewed-by: Guido Trotter <ultrotter@google.com>

- Use entities as examples for storage types that are actually storage
types.
- Fix mixing up 'external_storage' and 'exclusive_storage'.

Signed-off-by: Helga Velroyen <helgav@google.com>
Reviewed-by: Guido Trotter <ultrotter@google.com>

To minimize the confusion between whether or not a storage type
is the same as a storage method, I updated the design doc to
use 'storage type' instead of 'storage method' consistently.

Signed-off-by: Helga Velroyen <helgav@google.com>
Reviewed-by: Guido Trotter <ultrotter@google.com>

This patch updates the design doc "Design correct reporting of storage
free space". The modifications were chosen to not conflict with any
future changes of Ganeti regarding storage pools.

Signed-off-by: Helga Velroyen <helgav@google.com>
Reviewed-by: Guido Trotter <ultrotter@google.com>

This is a long standing bug in Ganeti. Add a small design on how we plan
to fix this for Ganeti 2.7.

Signed-off-by: Guido Trotter <ultrotter@google.com>
Reviewed-by: Iustin Pop <iustin@google.com>
Reviewed-by: Helga Velroyen <helgav@google.com>