Using the system resolver autonomic quiescing of unresponsive name servers

To use the system resolver autonomic quiescing of unresponsive name servers, perform the appropriate tasks in Table 1.

Table 1. System resolver autonomic quiescing of unresponsive name servers
Task Reference
If you have not customized the resolver, create a resolver setup file and the resolver address space. See the following topics in z/OS Communications Server: IP Configuration Guide:
If you have not used a global TCPIP.DATA file, perform the following steps:
  1. Create a global TCPIP.DATA file.
  2. At a minimum, code the IP addresses of the name servers to be used for resolver queries in the global TCPIP.DATA file.
  3. Code the GLOBALTCPIPDATA setup statement in the resolver setup file and specify the name of the global TCPIP.DATA file as the statement value.
Determine the appropriate name server responsiveness threshold percentage to use initially for your environment. If you use the autonomic quiescing of the unresponsive name server function, you must code a value for the percentage parameter on the UNRESPONSIVETHRESHOLD setup statement because this has no default value. Optimizing the UNRESPONSIVETHRESHOLD value for your network in z/OS Communications Server: IP Configuration Guide
Code the UNRESPONSIVETHRESHOLD (percentage,AUTOQUIESCE) setup statement in the resolver setup file. UNRESPONSIVETHRESHOLD statement in z/OS Communications Server: IP Configuration Reference
If the resolver is not already started, start the resolver address space. If the resolver is already started, issue the MODIFY resolver,REFRESH,SETUP=setup_file_name command to enable the autonomic quiescing function:
  • Verify that message EZZ9304I AUTOQUIESCE is in the command output.
  • Verify that the list of name servers in the global TCPIP.DATA file is in message EZD2035I in the command output.
Parent topic: System resolver autonomic quiescing of unresponsive name servers