Enable Asynchronous TCP/IP sockets I/O for Liberty on z/OS

By default, the Liberty server uses a Java implementation to handle incoming TCPIP requests. To obtain improve performance and scalability in many environments, enable the asynchronous TCP/IP sockets I/O for Liberty (AsyncIO) on z/OS service and take advantage of native z/OS services.

To enable the AsyncIO on z/OS service, you define the security setup to permit the Authorized AsyncIO Service(ZOSAIO):

• Start the Angel process:

  START bbgzangl

  See Administering Liberty on z/OS.

• Define the security setup to permit the Authorized AsyncIO Service(ZOSAIO):

  RDEF SERVER BBG.AUTHMOD.BBGZSAFM.ZOSAIO UACC(NONE)   
  PERMIT BBG.AUTHMOD.BBGZSAFM.ZOSAIO CLASS(SERVER) ACCESS(READ) id(wlpuser1)

  See Enable z/OS authorized services in Liberty for z/OS.

What to do next

This procedure enables the AsyncIO on z/OS service by default. However, if the AsyncIO z/OS service is enabled, we can disable it within a particular server by adding the following property to the bootstrap.properties file:

com.ibm.ws.tcpchannel.useZosAio=false