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