DOCS-9267 WT space requirements for repairDatabase

Author: kevinadi

source/reference/command/repairDatabase.txt

@@ -96,22 +96,31 @@ Behavior
 
 .. include:: /includes/warning-blocking-global.rst
 
-.. note:: :dbcommand:`repairDatabase` requires free disk space equal to the size
-   of your current data set plus 2 gigabytes. If the volume that holds dbpath
-   lacks sufficient space, you can mount a separate volume
-   and use that for the repair. When mounting a separate volume for
-   :dbcommand:`repairDatabase` you must run :dbcommand:`repairDatabase`
-   from the command line and use the
-   :option:`--repairpath <mongod --repairpath>`
-   switch to specify the folder in which to store
-   temporary repair files.
-
-
 The time requirement for :dbcommand:`repairDatabase` depends on the
 size of the data set.
 
 :dbcommand:`repairDatabase` recreates all indexes in the database.
 
+MMAPv1
+~~~~~~
+
+:dbcommand:`repairDatabase` requires free disk space equal to the size of your
+current data set plus 2 gigabytes.
+If the volume that holds dbpath lacks sufficient space, you can mount a separate volume
+and use that for the repair. When mounting a separate volume for
+:dbcommand:`repairDatabase` you must run :dbcommand:`repairDatabase`
+from the command line and use the
+:option:`--repairpath <mongod --repairpath>`
+switch to specify the folder in which to store
+temporary repair files.
+
+WiredTiger
+~~~~~~~~~~
+
+:dbcommand:`repairDatabase` performs the operation in-place and does not require
+additional disk space.
+
+
 ``repairDatabase`` and ``compact``
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~