Chapter 3. Central processor complex system design 129
3.7.5 LPAR dynamic storage reconfiguration
Dynamic storage reconfiguration on z13s servers allows an operating system that is running
on an LPAR to add (nondisruptively) its reserved storage amount to its configuration. This
process can occur only if unused storage exists. This unused storage can be obtained when
another LPAR releases storage, or when a concurrent memory upgrade takes place. With
dynamic storage reconfiguration, the unused storage does not have to be continuous.
When an operating system running on an LPAR assigns a storage increment to its
configuration, PR/SM determines whether any free storage increments are available. PR/SM
then dynamically brings the storage online.PR/SM dynamically takes offline a storage
increment and makes it available to other partitions when an operating system running on an
LPAR releases a storage increment.
3.8 Intelligent Resource Director
IRD is a z13, z13s, and z Systems capability that is used only by z/OS. IRD is a function that
optimizes processor and channel resource utilization across LPARs within a single z Systems
server.
This feature extends the concept of goal-oriented resource management. It does so by
grouping system images that are on the same z13, z13s or z Systems servers running in
LPAR mode, and in the same Parallel Sysplex, into an
LPAR cluster. This configuration allows
WLM to manage resources, both processor and I/O, not just in one single image, but across
the entire cluster of system images.
Figure 3-15 shows an LPAR cluster. It contains three z/OS images, and one Linux image that
are managed by the cluster. Included as part of the entire Parallel Sysplex is another z/OS
image and a coupling facility image. In this example, the scope over which IRD has control is
the defined LPAR cluster.
Figure 3-15 IRD LPAR cluster example
z/OS
LPAR Cluster
z/OS
z/OS
z/OS
CF
z Systems
Linux
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