janhorstmann
commented
2 months ago Completed tasks:
- Setup of a virtualized test environment for block device export/import via iSCSI
- Evaluation of the device mapper clone target in a virtualized environment
- Benchmarks of the device mapper clone target in a virtualized environment to determine the influence of network and metadata device latency on read and write performance
- Study of existing mechanisms in the cinder source code and other drivers which could be useful in the design of a dm-clone based driver
- Design of the core driver functionality
- Presenting the core functionality and concepts to a wider audience in the Team IaaS Meeting
- Publication of the concept in a blog post
- Setup of a local OpenStack environment for rapid prototyping and testing of cinder driver code
- Initial implementation in a PoC cinder driver
- Refinement of the concept for the case of volume detachments during data transfer and implementation
- Refinement of the concept to use attachments for tracking of volume state instead of the more user tailored volume status and implementation
- Testing of data integrity during attach-/detachment and instance live migrations
- Refinement of the concept to indiscriminately create overlaying linear device mapper targets to prevent data corruption
- Testing of various instance and volume actions
- Refinement of attachment status tracking to work around an unfixed bug in cinder and additionally support instance rebuild
- Integration of the PoC driver in the OSISM testbed to allow testing by a wider audience
- Presentation of the existing driver functionality
- Refinement of the concept for remote connections
- Rework of the remote connection logic from a hack only supporting iSCSI to a general solution for multiple protocols already supported by cinder and os-brick
- Outreach to the upstream community for feedback on the concept and PoC
https://docs.kernel.org/admin-guide/device-mapper/dm-clone.html