Table 6-5 shows the help and information list for adding the HMC definition. If the DNS is configured in your environment and DNS can do resolution for HMC IP and the  host name, then you can press F4 to select one HMC to perform the add operation.  172  IBM PowerHA SystemMirror V7.2.3 for IBM AIX and V7.2.2 for Linux Table 6-5 Context-sensitive help and associated list for Add HMC Definition menu Name Context-sensitive help (F1) Associated list (F4) HMC name Enter the host name for the HMC. An IP address  is also accepted here. Both IPv4 and IPv6  addresses are supported. Yes (single-selection). The list is obtained by  running the following  command:  /usr/sbin/rsct/bin/rmcdo mainstatus -s ctrmc -a IP DLPAR operations  timeout (in  minutes) Enter a timeout in minutes by using DLPAR  commands that you run on an HMC (use the  -w parameter). The  -w  parameter is used with the  chhwres  command only when allocating or  releasing resources. The parameter is adjusted  according to the type of resources (for memory,  1 minute per gigabyte is added to this timeout).  Setting no value means that you use the default  value, which is defined in the Change/Show  Default HMC Tunables panel. When  -1  is  displayed in this field, it indicates that the default  value is used. None. Number of retries Enter a number of times one HMC command is  retried before the HMC is considered as  non-responding. The next HMC in the list is used  after this number of retries fails. Setting no value  means that you use the default value, which is  defined in the Change/Show Default HMC  Tunables panel. When  -1  is displayed in this  field, it indicates that the default value is used. None. Delay between  retries (in  seconds) Enter a delay in seconds between two  successive retries. Setting no value means that  you use the default value, which is defined in the  Change/Show Default HMC Tunables panel.  When  -1  is displayed in this field, it indicates that  the default value is used. None. Nodes Enter the list of nodes that use this HMC. Yes (multiple-selection). A list of nodes to be  proposed can be obtained  by running the following  command:  odmget HACMPnode Sites Enter the sites that use this HMC. All nodes of  the sites then use this HMC by default, unless  the node defines an HMC as its own level. Yes (multiple-selection). A list of sites to be proposed  can be obtained by running  the following command:  odmget HACMPsite Check connectivity  between the HMC  and nodes Select  Yes  to check communication links  between nodes and HMC.  <Yes>|<No>. The default is  Yes. 