There is one VG (sharevg) in this RG, and there is one hdisk in this VG. You must set the  parameter  reserve_policy  to  no_reserve  for all the disks if you want to enable the disk  fencing policy. In our case, hdisk2 is used, so you must run the following command on each  PowerHA node: chdev -l hdisk2 -a reserve_policy=no_reserve This section describes the quarantine policy configuration in a PowerHA cluster. Note:  If the ANHP policy is also enabled, in case of a cluster split, ANHP takes effect first. Complete the following steps: Use the SMIT fast path  smitty cm_cluster_quarantine_disk_dialog , or you can run  smitty  sysmirror  and select  Custom Cluster Configuration  Cluster Nodes and Networks Initial Cluster Setup (Custom)  Configure Cluster Split and Merge Policy  Split and  Merge Management Policy  Quarantine Policy  Disk Fencing . 9.12.2 Quarantine policy configuration in PowerHA Ensuring that the active node halt policy is disabled Enabling the disk fencing quarantine policy 1. Use the SMIT fast path  smitty cm_cluster_quarintine_halt , or run  smitty sysmirror  and then select  Custom Cluster Configuration  Cluster Nodes and Networks Initial Cluster Setup (Custom)  Configure Cluster Split and Merge Policy  Split  and Merge Management Policy  Quarantine Policy  Active Node Halt Policy . 2. Example 9-83 shows the window. Select  Configure Active Node Halt Policy . Example 9-83 Configuring the active node halt policy Active Node Halt Policy Move cursor to desired item and press Enter. HMC Configuration Configure Active Node Halt Policy Active Node Halt Policy Type or select values in entry fields. Press Enter AFTER making all desired changes. [Entry Fields] * Active Node Halt Policy No + * Critical Resource Group [testRG] Example 9-84 Disabling the active node halt policy 3. Example 9-84 shows where you can disable the ANHP. 400  IBM PowerHA SystemMirror V7.2.3 for IBM AIX and V7.2.2 for Linux