IPL boost

IPL boost is controlled by BOOST= in the IEASYSxx member of parmlib. If you haven’t disabled System Recovery Boost in parmlib, IPL boost is automatically activated during IPL, and lasts for 1 hour. If you want to stop the IPL boost prior to the 1-hour time limit, you can issue system command START IEABE (IEA Boost End) to do so. The invoked module will likely complete before the (asynchronous) stopping of the boost completes.

During IPL boost, WLM routing services specifies the correct, boosted capacity for most of the duration of the boost. A few minutes before the scheduled end of the boost, WLM begins reducing the routing weight, so that by the end of the boost, the routing weight matches the regular capacity of the image. The interval of time this decrease in routing weight happens over can be influenced by the RTBELEADTIME option in the IEAOPTxx member of parmlib.

For more information about the BOOST parameter of IEASYSxx, see Turning on System Recovery Boost.