--- /dev/null
+Unmount
+~~~~~~~
+
+.Disconnect RPCs
+[[umount-rpcs]
+image::umount_rpcs.png["Disconnect RPCs", height=150]
+
+//////////////////////////////////////////////////////////////////////
+The umount_rpcs.png diagram resembles this text art:
+
+Time
+Step Client MGS MDT OST
+ ------- ------- -------- ------
+1 OST_DISCONNECT-------------------------------->
+2 <--------------------------------OST_DISCONNECT
+3 MDS_DISCONNECT----------------->
+4 <-----------------MDS_DISCONNECT
+5 MGS_DISCONNECT->
+6 <-MGS_DISCONNECT
+//////////////////////////////////////////////////////////////////////
+