Complete the following steps: As an alternative, you can also stop the entire cluster by running the following command: clmgr stop cluster Make sure that the cluster node is in the  ST_INIT  state by reviewing the  clcmd lssrc -ls  clstrmgrES|grep state  output. 1. Stop cluster services on both nodes decano1 and bolsilludo2 by running  smitty clstop  and selecting the options that are shown in Figure 4-8. The OK response appears quickly. Stop Cluster Services Type or select values in entry fields. Press Enter AFTER making all desired changes. [Entry Fields] * Stop now, on system restart or both now + Stop Cluster Services on these nodes [decano1,bolsilludo2] + BROADCAST cluster shutdown? true + * Select an Action on Resource Groups Bring Resource Groups> + F1=Help F2=Refresh F3=Cancel F4=List F5=Reset F6=Command F7=Edit F8=Image F9=Shell F10=Exit Enter=Do root@decano1:/> clcmd lssrc -s clcomd ------------------------------- NODE decano1 ------------------------------- Subsystem Group PID Status  clcomd caa 6947288 active ------------------------------- NODE bolsilludo2 ------------------------------- Subsystem Group PID Status  clcomd caa 6881750 active root@decano1:/> Figure 4-8 Stopping the cluster services Figure 4-9 Verifying that clcomd is active 3. Verify that the  clcomd  daemon is active on both nodes, as shown in Figure 4-9. 2. Upgrade AIX on both nodes. Important:  If upgrading to AIX 7.2.0, see the  AIX 7.2 Release Notes  regarding RSCT  file sets when upgrading. In our scenario, we have supported AIX levels for PowerHA V7.2.3 and do not need to  perform this step, but if you do this step, a restart is required before continuing. 98  IBM PowerHA SystemMirror V7.2.3 for IBM AIX and V7.2.2 for Linux