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Typically Longhorn will deploy and use a newer version of instance manager after the version bump. But Longhorn won’t kill the old instance managers as long as there are engine/replica running in them. In your case, it seems that somehow all the old instance managers directly disappeared… Weird… • For debugging purpose, you can generate the support bundle and send it to us. • Can you try to detach the volumes (and stop the corresponding pods)? If the volumes can be detached, then please apply engine upgrade for these volumes. After that, the volume may be available. If the data inside the volume crashes, you may need to fix it manually or apply snapshot revert/backup restore.