Figure 9-9 shows the result after confirming the configuration. Before configuring a disk as tiebreaker, you can check its current reservation policy by using  the AIX command  devrsrv , as shown in Example 9-1. When cluster services are started, the first time after a tiebreaker disk is configured on a  node, the reservation policy of the tiebreaker disk is set to  PR_exclusive  with a persistent  reserve key, as shown in Example 9-2. Example 9-2 The devrsrv command shows PR_exclusive Example 9-1 The devrsrv command shows no reserve root@testnode1[/]# devrsrv -c query -l hdisk3 Device Reservation State Information ================================================== Device Name : hdisk3 Device Open On Current Host? : NO ODM Reservation Policy : NO RESERVE Device Reservation State : NO RESERVE root@testnode1[/]# devrsrv -c query -l hdisk3 Device Reservation State Information ================================================== Device Name : hdisk3 Device Open On Current Host? : NO ODM Reservation Policy : PR EXCLUSIVE ODM PR Key Value : 8477804151029074886 Device Reservation State : NO RESERVE Registered PR Keys : No Keys Registered PR Capabilities Byte[2] : 0x15 CRH ATP_C PTPL_C PR Capabilities Byte[3] : 0xa1 PTPL_A PR Types Supported : PR_WE_AR PR_EA_RO PR_WE_RO PR_EA PR_WE PR_EA_AR  332  IBM PowerHA SystemMirror V7.2.3 for IBM AIX and V7.2.2 for Linux Figure 9-9 Tiebreaker disk successfully added  COMMAND STATUS Command: OK stdout: yes stderr: no Before command completion, additional instructions may appear below. hdisk2 changed The PowerHA SystemMirror split and merge policies have been updated. Current policies are: Split Handling Policy : TieBreaker Disk Merge Handling Policy : TieBreaker Disk Tie Breaker : hdisk2 Split and Merge Action Plan : Reboot The configuration must be synchronized to make this change known across the  cluster. Critical Resource Group : F1=Help F2=Refresh F3=Cancel F6=Command F8=Image F9=Shell F10=Exit /=Find n=Find Next