3.1 KiB
Allow dynamic enable/disable of SRR capability
Include the URL of your launchpad blueprint:
https://blueprints.launchpad.net/nova-powervm/+spec/srr-capability-dynamic-toggle
Currently to enable or disable the SRR capability on the VM we need to have the VM in shutoff state. We should be able to toggle this field dynamically so that the shutdown of a VM is not needed.
Problem description
The simplified remote restart (SRR) capability governs whether a VM can be rebuilt (remote restarted) on a different host when the host on which the VM resides is down. Currently this attribute can be changed only when the VM is in shut-off state. This blueprint addresses that by enabling toggle of simplified remote restart capability dynamically (while the VM is still active).
Use Cases
The end user would like to : - Enable the srr capability on the VM without shutting it down so that any workloads on the VM are unaffected. - Disable the srr capability for a VM which need not be rebuilt to another host while the VM is still up and running.
Proposed change
The SRR capability is a VM level attribute and can be changed using the resize operation. In case of a resize operation for an active VM - Check if the hypervisor supports dynamic toggle of srr capability. - If it is supported proceed with updating of srr capability if it has been changed. - Throw a warning if update of srr capability is not supported.
Alternatives
None
Security impact
None
End user impact
None
Performance Impact
The change is srr capability is not likely to happen very frequently so this should not have a major impact. When the change happens the impact on the performance of any other component (the VM, the compute service, the REST service, etc.) should be negligible.
Deployer impact
End user will be able to dynamically the toggle the srr capability for the VM. The changes can be utilized immediately once they are deployed.
Developer impact
None
Implementation
Assignee(s)
- Primary assignee:
-
manasmandlekar
- Other contributors:
-
shyvenug
Work Items
NA
Dependencies
Need to work with PowerVM platform team to ensure that the srr toggle capability is exposed for the Compute driver to consume.
Testing
The testing of the change requires full Openstack environment with Compute resources configured. - Ensure srr state for VM can be toggled when it is up and running. - Ensure srr state for VM can be toggled when it is shut-off. - Perform rebuild operations to ensure that the capability is indeed getting utilized.
Documentation Impact
None
References
None
History
| Release Name | Description |
|---|---|
| Pike | Introduced |