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.
Use Cases¶
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
