+This value can be set with
+.B --grow
+for RAID level 1/4/5/6. If the array was created with a size smaller
+than the currently active drives, the extra space can be accessed
+using
+.BR --grow .
+
+.TP
+.BR --assume-clean
+Tell
+.I mdadm
+that the array pre-existed and is known to be clean. This is only
+really useful for Building RAID1 array. Only use this if you really
+know what you are doing. This is currently only supported for --build.
+
+.TP
+.BR -R ", " --run
+Insist that
+.I mdadm
+run the array, even if some of the components
+appear to be active in another array or filesystem. Normally
+.I mdadm
+will ask for confirmation before including such components in an
+array. This option causes that question to be suppressed.
+
+.TP
+.BR -f ", " --force
+Insist that
+.I mdadm
+accept the geometry and layout specified without question. Normally
+.I mdadm
+will not allow creation of an array with only one device, and will try
+to create a raid5 array with one missing drive (as this makes the
+initial resync work faster). With
+.BR --force ,
+.I mdadm
+will not try to be so clever.
+
+.TP
+.BR -a ", " "--auto{=no,yes,md,mdp,part,p}{NN}"
+Instruct mdadm to create the device file if needed, and to allocate
+an unused minor number. "yes" or "md" causes a non-partitionable array
+to be used. "mdp", "part" or "p" causes a partitionable array (2.6 and
+later) to be used. The argumentment can also come immediately after
+"-a". e.g. "-ap".
+
+For partitionable arrays,
+.I mdadm
+will create the device file for the whole array and for the first 4
+partitions. A different number of partitions can be specified at the
+end of this option (e.g.
+.BR --auto=p7 ).
+If the device name ends with a digit, the partition names add an
+underscore, a 'p', and a number, e.g. "/dev/home1_p3". If there is no
+trailing digit, then the partition names just have a number added,
+e.g. "/dev/scratch3".
+