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Local storage root disk is melded with its template #9370
Description
Tested a few scenarios (not sure exactly which one) but in my testing caused the root of the VM melded to its template when using local storage on KVM;
- VM migration (with local storage) from one host to another
- VM's root disk volume take snapshot & revert to the volume snapshot
- VM's instance snapshot first with disk & revert; next VM snapshot with memory & revert
Expected that VM's root disk in case of root disk still uses the template as backing file.
ISSUE TYPE
- Bug Report
COMPONENT NAME
KVM, local storage VM
CLOUDSTACK VERSION
4.19/4.19.1
CONFIGURATION
Adv zone ubuntu with local storage (22.04)
OS / ENVIRONMENT
Ubuntu 22.04
Activity
DaanHoogland commentedon Jan 2, 2025
@rohityadavcloud , can you update the issue (if you have more precise data), please?
JoaoJandre commentedon Jan 2, 2025
@rohityadavcloud @DaanHoogland The first behavior was explained in #8911:
Migrating from local to local storage would consolidate the volume and its template. However, since #8911 was accepted, this behavior has been changed, now the volume should keep its template on every file-based to file-based storage migration (using KVM).
Regarding your second case, when reverting a volume snapshot, the volume will no longer have a backing file, this is expected from the snapshot process, I don't believe it has ever been different.
About your last case, since the current disk-only VM snapshot process is based on the volume snapshot process, it has the same behavior as above. Once #9270 is accepted, I plan on opening a PR that will introduce a new disk-only VM snapshot process which will keep the volume's backing file (among other benefits).
yadvr commentedon Mar 4, 2025
Closing this for now.