+Specify new inode size for underlying ext3 file system. Must be a power of 2
+between 128 and 4096. The default inode size is selected based on the default
+number of stripes specified for the filesystem.
+.TP
+--group_upcall <pathname>
+The group upcall program to call for resolving a user's secondary groups.
+The default value is NONE, which means that the MDS will use whatever
+supplementary group is passed from the client. The supplied upcall is
+/usr/sbin/l_getgroups, which gets groups from the MDS's /etc/group file
+based on the client-supplied UID.