4 ms·
> With IBM z17 ME1, concurrent upgrades are available for central processors (CPs), Integrated Facilities for Linux (IFLs), Integrated Coupling Facilities (ICFs
by yencabulator 2y ago
> With IBM z17 ME1, concurrent upgrades are available for central processors (CPs),
Integrated Facilities for Linux (IFLs), Integrated Coupling Facilities (ICFs), and IBM Z
Integrated Information Processors (zIIPs). However, concurrent PU upgrades require that
more PUs are physically installed but not activated previously.
> In the rare event of a PU failure, one of the spare PUs is immediately and transparently
activated and assigned the characteristics of the failing PU. Two spare PUs are always
available on an IBM z17 ME1.
PU = Processor Unit, a common name for the CP/IFL/etc variants above.
So, you can tolerate minimum 2 CPU failures (money gets more) without shutting down. Beyond that, you can move active workloads transparently to a (possibly remote) zSeries, to schedule maintenance.