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

Shewale, Bhagyashri Bhagyashri.Shewale at nttdata.com
Fri Nov 24 12:17:49 UTC 2017

Hi Matt

Thank you :)

Bhagyashri Shewale

-----Original Message-----
From: Matt Riedemann [mailto:mriedemos at gmail.com] 
Sent: Thursday, November 23, 2017 9:05 PM
To: openstack-dev at lists.openstack.org
Subject: Re: [openstack-dev] [nova] Need opinion: request zero root disk for boot-from-volume instances

On 11/22/2017 12:51 AM, Shewale, Bhagyashri wrote:
> 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.
> *_Request_:*
> 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.
> Reference:
> [1]: https://bugs.launchpad.net/nova/+bug/1469179
> [2]: https://review.openstack.org/#/c/428481
> [3]: https://review.openstack.org/#/c/428505
> Regards,
> Bhagyashri Shewale

You might be interested in this spec I started in Queens:


It's based on some discussions we've had related to this issue since the Boston summit for Pike. It needs work but might be helpful.




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