yahoo-eng-team team mailing list archive

[Feodor Tersin <ftersin@xxxxxxxxxxx>]

Public bug reported:

instance.root_gb means size of host local disk used by the instance root
disk. All code that uses this attribute treats it that way.

Volume-backed instances have root disks placed in Cinder. Therefore
obviously root_gb should be 0 for them. However currently this is not
so. The same applies to min_size and size image attributes, used for
boot from a volume.

As a result the code which uses these attributes works incorrectly. Some
problems are already detected [1], other are not yet [2].

To fix all these problems fully it is proposed to set root_gb, min_size,
size to 0 for volume-backed instances.

[1] https://bugs.launchpad.net/nova/+bug/1334974
https://bugs.launchpad.net/nova/+bug/1459491
https://bugs.launchpad.net/nova/+bug/1466305
https://bugs.launchpad.net/nova/+bug/1457517
[2] https://github.com/openstack/nova/blob/master/nova/notifications.py#L407
https://github.com/openstack/nova/blob/master/nova/scheduler/host_manager.py#L250

** Affects: nova
     Importance: Undecided
         Status: New

-- 
You received this bug notification because you are a member of Yahoo!
Engineering Team, which is subscribed to OpenStack Compute (nova).
https://bugs.launchpad.net/bugs/1469179

Title:
  instance.root_gb should be 0 for volume-backed instances

Status in OpenStack Compute (Nova):
  New

Bug description:
  instance.root_gb means size of host local disk used by the instance
  root disk. All code that uses this attribute treats it that way.

  Volume-backed instances have root disks placed in Cinder. Therefore
  obviously root_gb should be 0 for them. However currently this is not
  so. The same applies to min_size and size image attributes, used for
  boot from a volume.

  As a result the code which uses these attributes works incorrectly.
  Some problems are already detected [1], other are not yet [2].

  To fix all these problems fully it is proposed to set root_gb,
  min_size, size to 0 for volume-backed instances.

  [1] https://bugs.launchpad.net/nova/+bug/1334974
  https://bugs.launchpad.net/nova/+bug/1459491
  https://bugs.launchpad.net/nova/+bug/1466305
  https://bugs.launchpad.net/nova/+bug/1457517
  [2] https://github.com/openstack/nova/blob/master/nova/notifications.py#L407
  https://github.com/openstack/nova/blob/master/nova/scheduler/host_manager.py#L250

To manage notifications about this bug go to:
https://bugs.launchpad.net/nova/+bug/1469179/+subscriptions