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[Radoslav Gerganov <rgerganov@xxxxxxxxxx>]

Public bug reported:

Virtual devices need a unit number when they are attached to a
controller. We cannot have two devices on the same controller with the
same unit number.

Currently, the selection of unit numbers is spread all over the driver
code, leaking to high-level functions like spawn() and rescue(). We need
to factor this out into helper functions which take care of choosing a
proper unit number and creating additional controllers if needed.

High-level functions need to communicate only the intent like 'attach
CDROM' or 'attach disk' and shouldn't bother with details like unit
numbers.

** Affects: nova
     Importance: Undecided
     Assignee: Radoslav Gerganov (rgerganov)
         Status: New


** Tags: vmware

** Changed in: nova
     Assignee: (unassigned) => Radoslav Gerganov (rgerganov)

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https://bugs.launchpad.net/bugs/1259981

Title:
  VMware: factor out the management of unit numbers

Status in OpenStack Compute (Nova):
  New

Bug description:
  Virtual devices need a unit number when they are attached to a
  controller. We cannot have two devices on the same controller with the
  same unit number.

  Currently, the selection of unit numbers is spread all over the driver
  code, leaking to high-level functions like spawn() and rescue(). We
  need to factor this out into helper functions which take care of
  choosing a proper unit number and creating additional controllers if
  needed.

  High-level functions need to communicate only the intent like 'attach
  CDROM' or 'attach disk' and shouldn't bother with details like unit
  numbers.

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