[openstack-dev] [nova] Need opinion: request zero root disk for boot-from-volume instances

Shewale, Bhagyashri Bhagyashri.Shewale at nttdata.com
Wed Nov 22 06:51:28 UTC 2017

Hi nova devs,

Just wanted to ask regarding request zero root disk for boot-from-volume instances patches [2] [3].

When user boot instance using bootable volume and flavor having non-zero disk_gb
then in that case it considers flavor disk_gb which is incorrect the calculation of host
disk space.


What are reconditions from the community to resolve the LP bug Reference: [1]?

Through multiple discussion on the patches there are two options to address this issue:

Option 1:

Merging of patches Reference: [2] and [3]

Option 2:

Operators will need to create new flavor with root_disk=0 for BFV
and ask users to use this new flavor if they want to boot the instance from volume.
(Release note may need to be updated in this case)

Could you please give opinion above two options.


[1]: https://bugs.launchpad.net/nova/+bug/1469179
[2]: https://review.openstack.org/#/c/428481
[3]: https://review.openstack.org/#/c/428505

Bhagyashri Shewale

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