z15 System Recovery Boost (SRB) and z/VSE
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The new mainframe - z15 - has an important new function - System Recovery Boost (SRB):
New IBM System Recovery Boost expedites everything you need to get back ready for workload execution, including planned operating system shutdown processing, operating system IPL (Initial Program Load), middleware/workload restart and recovery, and uniquely the client workload execution that follows helping you catch up for lost time. It will let businesses return their systems to doing normal work faster for scenarios such as planned software maintenance and patching, but also in the event of Disaster Recovery scenarios when you need it the most.
z/VM will provide support for System Recovery Boost for both planned system shutdown and system startup. The increased capacity of general-purpose processors during a z/VM system startup or shutdown can be "inherited" by z/VSE guests to also provide additional processing capacity to accelerate the guest startup and/or shutdown processing.
In z15 LPAR z/VSE does not support System Recovery Boost. The z15 announcement letter, however, holds a Statement of Direction for z/VSE (SOD):
See also SOD disclaimer in announcement letter.
For more details see the description section of the z15 announcement letter - here.