The process is shown in Figure 6-40. The process is similar to “Resource group offline at the primary node (ITSO_S1Node1)” on  page 227. In this process, PowerHA SystemMirror tries to release all the resources that were  held by the two RGs before. If a resource was not released because of a PowerHA SystemMirror service crash or an AIX  operating system crash, PowerHA SystemMirror can do the release operation automatically  after this node starts. This operation occurs before you start the PowerHA SystemMirror  service by using the  smitty clstart  or the  clmgr start cluster  commands. Testing summary Figure 6-40 Resource release process by using the ARAF process Chapter 6. Resource Optimized High Availability  235