Important:  Always test the cluster thoroughly after migrating. This method applies only when the AIX level is already at the appropriate levels to support  PowerHA V7.2.1 or later.  Tip:  To see a demonstration of performing an offline migration from PowerHA V7.1.3 to  PowerHA V7.2.1, see this YouTube video. Although the version level is different, the steps are identical as though starting from  Version 7.2.0. 4.3.5 Nondisruptive upgrade from PowerHA V7.2.0 1. Stop cluster services by using the  unmanage  option on the RGs on node hugo-atilio, as  shown in Example 4-10. 2. Upgrade PowerHA ( update_all ) by running the following command from within the  directory in which the updates are (see Example 4-7 on page 106): 3. Start the cluster services with an automatic manage of the RGs on hugo-atilio, as shown  in Example 4-11. Example 4-10 Stopping the cluster node with the unmanage option Example 4-11 Starting the cluster node with the automatic manage option root@hugo-atilio:/> s/clmgr stop node=hugo-atilio manage=unmanage < Warning: "WHEN" must be specified. Since it was not, a default of "now" will be used. Broadcast message from root@hugo-atilio (tty) at 00:43:56 ... PowerHA SystemMirror on hugo-atilio shutting down. Please exit any cluster  applications... hugo-atilio: 0513-044 The clevmgrdES Subsystem was requested to stop. . "hugo-atilio" is now unmanaged. hugo-atilio: Jan 17 2019 00:43:56/usr/es/sbin/cluster/utilities/clstop: called  with flags -N -f root@hugo-atilio:/> root@hugo-atilio:/> de=hugo-atilio < Warning: "WHEN" must be specified. Since it was not, a default of "now" will be used. Warning: "MANAGE" must be specified. Since it was not, a default of "auto" will be used. install_all_updates -vY -d .  Chapter 4. Migration  123