Implement checkBitmap to check bitmap status before backup #866
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dupondje
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Is there a corresponding vdsm PR? it would need to be merged first, also, I think we'll need to add this verb to host capabilities[1] so it isn't sent to older hosts [1] https://github.com/oVirt/vdsm/blob/07d3089049b1ac81a3efbc14856679c4aa82b412/lib/vdsm/host/caps.py |
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Updated the code to work with the latest vdsm patch oVirt/vdsm#394 |
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Extend the GetQemuImageInfoVDSCommand command to also provide information about the bitmaps. This data will only be valid when the hypervisor has the qemu_image_info_bitmaps capability. The bitmap information can be used to validate the engine's bitmap data with the qemu-img info. VDSM PR: oVirt/vdsm#394 Signed-off-by: Jean-Louis Dupond <[email protected]>
…ntsCommand If there is checkpoint inconsistency between the checkpoints in the database and those on-disk, then we need to remove all checkpoints on-disk and in the database. But the on-disk removal can fail because the checkpoint is already gone because of some corruption (for example due to an unclean shutdown). Therefor we want to allow DeleteAllVmCheckpointsCommand to continue on failure in some cases. Signed-off-by: Jean-Louis Dupond <[email protected]>
Instead of re-implement the functionality from DeleteAllVmCheckpoints, we just use DeleteAllVmCheckpoints and pass to force flag to allow DeleteAllVmCheckpoints to continue on failures. Signed-off-by: Jean-Louis Dupond <[email protected]>
Sometimes a bitmap can become invalid/corrupt without oVirt noticing this. For example if a hypervisor crashes, the active bitmap will become invalid. This means that the qcow2 volume does not contain the bitmap anymore, but oVirt thinks the bitmap still exists because it's in the database. This will currently cause oVirt to fail to create a NBDServer, as it will error with 'Bitmap does not exist in ...'. We use the QemuImageInfo to get all the on-disk bitmaps and compare them with the bitmaps in the oVirt database. If there is some inconsistency we remove all the bitmaps/checkpoints. Signed-off-by: Jean-Louis Dupond <[email protected]>
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Sometimes a bitmap cam become invalid/corrupt without oVirt noticing this. For example if a hypervisor crashes, the active bitmap will become invalid.
This will currently cause oVirt to fail to create a NBDServer, as it will error with 'Bitmap does not exist in ...'.
We add a command to check the bitmap status before the backup is created. If the bitmap is invalid, we throw an error and remove the invalid bitmapId.
The VDSM side also needs to be implemented, but that's easy :)
Would be great if some maintainer can give his comments on the idea and the code!