96e7b61fc4
New feature aims to support volume backup for volumes whose format is qcow2 other than raw blueprint support-volume-backup-for-qcow2 Change-Id: I45b51bf385f7eff057c0096abc2ae457494c5e69
2.2 KiB
2.2 KiB
Support volume backup for qcow2
https://blueprints.launchpad.net/cinder/+spec/support-volume-backup-for-qcow2
Currently, cinder-backup doesn't support qcow2 format disk. Add the support for it will make drivers which use qcow2 as volume, such as glusterfs etc, work together with cinder-backup, and can also make nfs driver use qcow2 as volume be possible.
Problem description
Currently, cinder-backup doesn't support qcow2 format disk because the backup code assumes the source volume is a raw volume. The destination (i.e. swift, rbd) should absolutely remain universal across all volume back-ends.
Proposed change
- Add qemu-nbd support to cinder-backup. Qemu-nbd can mount qcow2 volume as a raw device to the host
- The backup_volume method in base class of remotefs driver (cinder.volume. drivers.nfs.RemoteFsDriver:backup_volume) will mount qcow2 volume as nbd device before call backup_service's backup method
Alternatives
None
Data model impact
None
REST API impact
None
Security impact
None
Notifications impact
None
Other end user impact
None
Performance Impact
None
Other deployer impact
Storage node which running cinder-volume will contains nbd kernel module.
Developer impact
None
Implementation
Assignee(s)
- Primary assignee:
-
Trump.Zhang <zhangleiqiang@huawei.com>
Work Items
- Add qemu-nbd support to cinder-backup. Qemu-nbd can mount qcow2 volume as a raw device to the host
- The backup_volume method in base class of remotefs driver (cinder.volume. drivers.nfs.RemoteFsDriver:backup_volume) will mount qcow2 volume as nbd device before call backup_service's backup method
Dependencies
None
Testing
None
Documentation Impact
None
References
None