146 lines
3.1 KiB
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146 lines
3.1 KiB
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..
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This work is licensed under a Creative Commons Attribution 3.0 Unported
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License.
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http://creativecommons.org/licenses/by/3.0/legalcode
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==============================================
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Allow dynamic enable/disable of SRR capability
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==============================================
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Include the URL of your launchpad blueprint:
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https://blueprints.launchpad.net/nova-powervm/+spec/srr-capability-dynamic-toggle
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Currently to enable or disable the SRR capability on the VM we need to have
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the VM in shutoff state. We should be able to toggle this field dynamically
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so that the shutdown of a VM is not needed.
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Problem description
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===================
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The simplified remote restart (SRR) capability governs whether a VM can be
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rebuilt (remote restarted) on a different host when the host on which the
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VM resides is down. Currently this attribute can be changed only when the VM
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is in shut-off state. This blueprint addresses that by enabling toggle
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of simplified remote restart capability dynamically (while the VM is still
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active).
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Use Cases
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---------
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The end user would like to :
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- Enable the srr capability on the VM without shutting it down so that any
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workloads on the VM are unaffected.
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- Disable the srr capability for a VM which need not be rebuilt to another
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host while the VM is still up and running.
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Proposed change
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===============
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The SRR capability is a VM level attribute and can be changed using
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the resize operation. In case of a resize operation for an active VM
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- Check if the hypervisor supports dynamic toggle of srr capability.
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- If it is supported proceed with updating of srr capability if it has been
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changed.
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- Throw a warning if update of srr capability is not supported.
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Alternatives
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------------
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None
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Security impact
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---------------
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None
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End user impact
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---------------
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None
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Performance Impact
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------------------
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The change is srr capability is not likely to happen very frequently so this
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should not have a major impact. When the change happens the impact on the
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performance of any other component (the VM, the compute service, the REST
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service, etc.) should be negligible.
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Deployer impact
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---------------
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End user will be able to dynamically the toggle the srr capability for the
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VM. The changes can be utilized immediately once they are deployed.
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Developer impact
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----------------
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None
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Implementation
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==============
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Assignee(s)
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-----------
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Primary assignee:
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manasmandlekar
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Other contributors:
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shyvenug
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Work Items
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----------
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NA
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Dependencies
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============
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Need to work with PowerVM platform team to ensure that the srr toggle
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capability is exposed for the Compute driver to consume.
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Testing
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=======
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The testing of the change requires full Openstack environment with
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Compute resources configured.
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- Ensure srr state for VM can be toggled when it is up and running.
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- Ensure srr state for VM can be toggled when it is shut-off.
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- Perform rebuild operations to ensure that the capability is indeed
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getting utilized.
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Documentation Impact
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====================
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None
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References
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==========
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None
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History
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=======
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.. list-table:: Revisions
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:header-rows: 1
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* - Release Name
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- Description
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* - Pike
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- Introduced
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