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When removing an incremental snapshot (For both KVM and XenServer), it is checked if the snapshot has a child or not. If it has, then the snapshot is not removed from the storage. For KVM incremental snapshots, snapshots in the same chain may be on different secondary storages (within the same zone). However, the child search process only considers snapshots from the same secondary storage as theirs. Therefore, if a snapshot has its parent snapshot on a different secondary storage, it will be completely removed, making the snapshot chain inconsistent.