+test -z "$EXTP_CREATE" && EXTP_CREATE="-s -b 4k -o compression=lz4"
+
+# on zfs destroy remove snapshots of instance disks
+test -z "$EXTP_DESTROY" && EXTP_DESTROY="-r"
+
+# emulate VG configured in cluster for wrapper scripts in sbin
+test -z "$EXTP_VG" && EXTP_VG='ffzgvg'