Introducing IBM Z System Recovery Boost
Sep 2025 · IBM Redbooks
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This IBM® Redpaper publication introduces System Recovery Boost (SRB), which is a firmware feature that was introduced with IBM z15TM and enhanced on IBM z16TM and IBM z17TM. SRB delivers substantially faster system shutdown and restart, short duration Recovery Process Boosts (RPBs) for sysplex events, and fast catch-up of an accumulated backlog of mission-critical workloads after specific events (such as system restart).
SRB is a firmware feature that is available on IBM z15, IBM z16, and IBM z17 central processor complexes (CPCs), and it requires operating system support for use. It is not available on older systems. Always check the latest firmware and software for available SRB functions.
The IBM Z server generations that are described in this paper are available as the following machine types and models (MTMs):
- Machine Type 3931 (M/T 3931) Model A01, which is identified as IBM z16 Model A01.
- Machine Type 3932 (M/T 3932) Models A02 and AGZ, which are identified as IBM z16 Model A02 and IBM z16 Model AGZ.
- Machine Type 8561 (M/T 8561) Model T01, which is identified as IBM z15 Model T01.
- Machine Type 8562 (M/T 8562) Model T02, which is identified as IBM z15 model T02.
- Machine Type 9175 (M/T 9175) Model ME1, which is identified as IBM z17 model ME1.
This IBM® Redpaper publication introduces System Recovery Boost (SRB), which is a firmware feature that was introduced with IBM z15TM and enhanced on IBM z16TM and IBM z17TM. SRB delivers substantially faster system shutdown and restart, short duration Recovery Process Boosts (RPBs) for sysplex e...
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