CinderFlamingoPTGSummary
Contents
Introduction
The Eleventh virtual PTG for the 2025.2 (Flamingo) cycle of Cinder was conducted from Wednesday, 9th April, 2025 to Friday, 11th April, 2025, 3 hours each day (1400-1700 UTC). This page will provide a summary of all the topics discussed throughout the PTG.
This document aims to give a summary of each session. More information is available on the cinder 2025.2 Epoxy PTG etherpad:
The sessions were recorded, so to get all the details of any discussion, you
can watch/listen to the recording. Links to the recordings for each day are
below their respective day's heading.
Recordings
See https://etherpad.opendev.org/p/apr2025-ptg-cinder for recording links, urls cannot be directly inserted on this page.
Summary
Eventlet Removal
This cycle we will try complete the removal of Eventlet from our codebase. We dicussed our current usage, including calls to sleep() and tpool.Proxy(). We agreed to split the work between Eric and me. I hope we can get these patches up and reviewed with time to spare before the release. An idea to revive our fake volume driver was raised to potentially gain greater confidence in high concurrency test configurations.
Testing Volume Replication
Although volume replication is support by a few of our in-tree drivers, there are no integration tests that verify correct behaviour in tempest. Discussions on adding tempest tests lead to Liron being interested in driving this effort. Changes will need to be made to devstack-ceph plugin to support deploying multiple ceph clusters, as well as gate configuration to run all of this in a multi-node environment. There are a few important moving pieces which may take some time to sort out, but we agreed to commit to working towards a solution in this cycle.
Follow-up from Epoxy
We have a few patch series that we didn't have time to review by the deadline of the Epoxy cycle. Volume type metadata, encryption format, and dm-clone just to name a few. Effort in reviewing and gathering feedback needs to be prioritized in the first half of the cycle to make sure we can confidently land these in Flamingo.
CI status
We should review our 3rd party CI instances to make sure they're actually running, running the correct tests in the context of the related change, and reporting results that can be viewed by a gerrit reviewer. It was noted that some of them fall short of some or all of these requirements. It would be helpful to gather a current status so that we can help vendors with awareness.
2023.2 Final Stable Release
On April 30, the stable/2023.2 branch will have it's final release. This will mark the end of cinderlib. We still have a few backports that need reviews currently, see etherpad for details.
Backup Improvements
crohmann raised 2 patches that both improve the speed of cinder-backup's startup routine, and decouple a volume's backup status from it's overall status. Eric and Brian agreed to review to help move these patches forward.
RBD Geometry Option
We've have an old patch to allow RBD's disk geometry to be configurable. This reportedly improves performance of Windows guests significantly. We agreed to make sure this gets reviewed in this cycle.
Stephen's Patches
We have 3 patches carried over from last cycle that need review. These include an OpenAPI series, a patch to map block storage AZs to Compute AZs, and updates to OSC. It would be really nice to get these reviewed in this cycle.
Tobias' Patches
We have several patches from Tobias all related to cinder-backup improvements. Including adding support for backup service to os-availability-zone, support for filters in query parameters, the addition of a summary API, and potentially adding a `type` field to the API to open the posibility of support backups types beyond just `full` or `incremental`.
