+ zconf_umount_clients $CLIENTS $MOUNT2
+ zconf_mount_clients $CLIENTS $MOUNT1
+
+ local param_file=$TMP/$tfile-params
+
+ local num=$(get_mds_dir $MOUNT1)
+
+ save_lustre_params $(facet_active_host mds$num) "mdt.*.commit_on_sharing" > $param_file
+
+ # COS enabled
+ local COS=1
+ do_facet mds$num lctl set_param mdt.*.commit_on_sharing=$COS
+
+ test_21b_sub mds$num || error "Not all renames are replayed. COS=$COS"
+
+ # COS disabled (should fail)
+ COS=0
+ do_facet mds$num lctl set_param mdt.*.commit_on_sharing=$COS
+
+ # there is still a window when transactions may be written to disk before
+ # the mds device is set R/O. To avoid such a rare test failure, the check
+ # is repeated several times.
+ local n_attempts=1
+ while true; do
+ test_21b_sub mds$num || break;
+ let n_attempts=n_attempts+1
+ [ $n_attempts -gt 3 ] &&
+ error "The test cannot check whether COS works or not: all renames are replied w/o COS"
+ done
+ restore_lustre_params < $param_file
+ rm -f $param_file
+ return 0
+}
+run_test 21b "commit on sharing, two clients"
+
+# end commit on sharing tests
+
+complete $(basename $0) $SECONDS