IBM z13s, Technical Manual

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Chapter 9. Reliability, availability, and serviceability
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The Manage Alternate HMC task allows you to reload internal code onto the alternate
HMC to minimize HMC downtime during an upgrade to a new driver level. After the new
driver is installed on the alternate HMC, it can be made active by running an HMC
switchover.
9.6 RAS capability for zBX Model 004
The zBX Model 004 exists only as a result of an MES from a zBX Model 002 or zBX Model
003. The zBX Model 004 is a stand-alone node that contains its own monitoring and
controlling SEs. The two new 1U rack-mounted server SEs, along with their displays and
keyboards, are added to the stand-alone zBX Model 004 frame B, below the TOR switches.
zBX Model 004 includes all the RAS capabilities that are available in the previous models,
and it was built with the traditional z Systems quality of service (QoS) to include RAS
capabilities. The zBX Mod 004 offering provides extended service capability independent of
the z13s hardware management structure.
zBX Model 004 is a stand-alone machine that can be added to an existing ensemble HMC as
an individual ensemble member. The zBX Model 004 is required to be defined to the HMC.
The ensemble HMC is used to run the zBX configuration and monitoring functions by using its
connectivity to its internal SEs.
Apart from a zBX configuration with one chassis that are installed, the zBX is configured to
provide
N + 1 components. All the components are designed to be replaced concurrently. In
addition, zBX configuration upgrades can be performed concurrently.
The zBX has two ToR switches. These switches provide N + 1 connectivity for the private
networks between the zBX and its internal support elements for monitoring, controlling, and
managing the zBX components.
BladeCenter components
Each BladeCenter has the following components:
򐂰 Up to 14 blade server slots. Blades can be removed, repaired, and replaced concurrently.
򐂰
( N + 1) Power Distribution Units (PDUs). If the PDUs have power inputs from two separate
sources, during a single source failure, the second PDU takes over the total load of its
BladeCenter.
򐂰 ( N + 1) hot-swap power module with fan. A pair of power modules provides power for
seven blades. A fully configured BladeCenter with 14 blades has a total of four power
modules.
򐂰
( N + 1) 1 GbE switch modules for the power system control network (PSCN).
򐂰 ( N + 1) 10 GbE High Speed switches for the intraensemble data network (IEDN).
򐂰 ( N + 1) 1000BaseT switches for the intranode management network (INMN).
򐂰 ( N + 1) 8 Gb FC switches for the external disk.
򐂰
(N+1) Internal 1U rack-mounted SEs with fully redundant (N+1) components.
򐂰 Two hot-swap advanced management modules (AMMs).
򐂰
Two hot-swap fans/blowers.