doc for nfs share mount option nordirplus

HereThereBeDragons · HereThereBeDragons · commit fcc5b40e39cd · 2023-01-20T14:34:59.000+01:00
diff --git a/cpt-configure.rst b/cpt-configure.rst
@@ -927,6 +927,11 @@ that is exported via NFS, the safety margin for the NFS maps needs be
 taken into account. It also might be necessary to monitor the actual
 space consumption.
 
+.. note::
+    The NFS share should be mounted with the mount option ``nordirplus``.
+    Without this option, traversals of directories with large number of files
+    can slow down significantly.
+
 Tuning
 ~~~~~~
 
