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Using the automatic IPL function z/OS MVS Planning: Operations SA23-1390-00 |
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As part of planning your installation's operations so that operators or the system can respond promptly and appropriately to disabled wait states, consider activating the AutoIPL function. AutoIPL can re-IPL z/OS®, or take a stand alone dump (SADMP), or take a SADMP and have SADMP re-IPL z/OS when it has finished. The desired actions are represented in an AutoIPL policy, which you state in a DIAGxx parmlib member that the system checks at wait state time. AutoIPL requires hardware support, standard on all systems beginning with System z10™ Enterprise Class (z10 EC). For System z9® Enterprise Class (z9 EC), AutoIPL is provided with feature code 9904 and hardware driver 67 or later (both are required). After applying the feature, you must IPL the system to detect AutoIPL on the z9 EC. AutoIPL is also available for a z/OS guest on z/VM® Release 5.3.0 or later. AutoIPL works on a single-system basis (that is, a disabled wait state on a given system prompts that system to take the actions stated in the AutoIPL policy of the system). Use the following steps to activate AutoIPL:
To deactivate AutoIPL:
Part of the AutoIPL support includes a hard-coded table of wait state and reason codes, called the wait state action table (WSAT), which is part of the z/OS nucleus. Each entry has a flag to indicate whether the SADMP part of the AutoIPL policy should be honored, and a flag to indicate whether the MVS™ part of the AutoIPL policy should be honored. (This is necessary because a few z/OS wait states are inappropriate for a SADMP or a re-IPL.) When the Loadwait component of z/OS is invoked to load a disabled wait state, it checks the requested wait state and reason code against the table. For non-restartable wait states, Loadwait will fully honor the AutoIPL policy unless a matching WSAT entry is found that has one or both flags off. If a bit is found off, then the corresponding SAD or re-IPL will not be performed. For restartable wait states, Loadwait will ignore the AutoIPL policy unless a matching WSAT entry is found that has one or both flags on. If a bit is found on, then the corresponding SAD or re-IPL will be performed. As of this writing, the WSAT contains no entries matching any restartable wait state and reason codes, so a restartable wait state request will not result in any AutoIPL action. The contents of the wait state action table are described in Wait state action table (WSAT). Note:
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