an unclean server restart (i.e. a crash) can cause data to be lost or
corrupted.
+.TP
+.IR sync
+Reply to requests only after the changes have been committed to stable
+storage (see
+.IR async
+above).
+
In releases of nfs-utils upto and including 1.0.0, this option was the
default. In this and future releases,
.I sync