File I/O Driver¶
https://blueprints.launchpad.net/nova-powervm/+spec/file-io-driver
The PowerVM driver currently uses logical volumes for localdisk ephemeral storage. This blueprint will add support for using file-backed disks as a localdisk ephemeral storage option.
Problem description¶
The PowerVM driver only supports logical volumes for localdisk ephemeral storage. It does not currently support storage that is presented as a file.
Use Cases¶
- As a user, I want to have the instance ephemeral storage backed by a file.
Proposed change¶
Add nova_powervm/virt/powervm/disk/fileio.py. This would extend the existing disk driver. Use the DISK_DRIVER powervm conf option to select file I/O. Will utilize the nova.conf option instances_path.
Alternatives¶
None
Security impact¶
None
End user impact¶
None
Performance Impact¶
Performance may change as the backing storage methods of VMs will be different.
Deployer impact¶
The deployer must set the DISK_DRIVER conf option to fileio and ensure that the instances_path conf option is set in order to utilize the changes described in the blueprint.
Developer impact¶
None
Implementation¶
Assignee(s)¶
- Primary assignee:
- tjakobs
- Other contributors:
- None
Work Items¶
- Create a nova-powervm fileio driver. Create associated UT.
Dependencies¶
Novalink 1.0.0.5
Testing¶
- Unit tests for all code
- Manual test will be driven using a File I/O ephemeral disk.
Documentation Impact¶
Will update the nova-powervm dev-ref to include File I/O as an additional ephemeral disk option.
References¶
None
