Derek Su

> @derekbit , I've added the auto-e2e-test label, and I encourage @longhorn/qa to submit a PR when they identify a bug. This will help developers reproduce the issue and verify...

### Root Cause While expanding the volume and before cancelling the expansion, `ExpansionRequired` is `true` and the sizes are: - v.spec.size: 22548578304 - e.spec.size: 22548578304 - e.status.currentSize: 21474836480 After issuing...

The issue won't be a blocker for v1.6.3. But checking with @shuo-wu first and see if he has any thought for fixing the issue.

> I don't think the [check](https://github.com/longhorn/longhorn-manager/blob/master/controller/volume_controller.go#L2029-L2030) @derekbit mentioned is the key. Yes, that's why I closed the [attempted fix](https://github.com/longhorn/longhorn-manager/pull/3165)...

@shuo-wu So, when a user encouters the issue, what it can do is https://github.com/longhorn/longhorn/issues/9466#issuecomment-2352006846, correct? How about drafting a KB for users? I think this might be enough.

After rethinking this issue, the behavior is expected and we only need a KB for this issue. WDYT @shuo-wu @innobead

@DamiaSan Feel free to request materials or support bundles for troubleshooting from the users. cc @innobead

> The user is using v2 engine with 1.7.3 release, maybe we should suggest to use a newer version because in the meanwhile many issues about stability have been resolved...

For delta rebuilding, Longhorn calculates the checksum of each block both on the source and destination sides and compares the checksums. If the checksums are mismatched, Longhorn sends the block...

@mantissahz Can you check the support bundle in https://github.com/longhorn/longhorn/issues/11113#issue-3140649375 and see if it is a delta rebuilding or a full rebuilding?