// via active healing.
			dg.Go(func() error {
				return disks[index].DeleteVersion(context.Background(), dstBucket, dstEntry, metadata[index], false, DeleteOptions{
					UndoWrite:  true,
					OldDataDir: dataDirs[index],
				})
			}, index)
		}
		dg.Wait()
	}
	var dataDir string
	var versions []byte
	if err == nil {