Storage Operations - IBM z13s Technical Manual

provides an enforceable upper limit on the amount of the specified processor type that can be
used in a partition.
Absolute capping is ideal for processor types and operating systems that the z/OS WLM
cannot control. Absolute capping is not intended as a replacement for defined capacity or
group capacity for z/OS, which are managed by WLM.
Absolute capping can be used with any z/OS, z/VM, or Linux on z LPAR running on
zEnterprise. If specified for a z/OS LPAR, it can be used concurrently with defined capacity or
group capacity management for z/OS. When used concurrently, the absolute capacity limit
becomes effective before other capping controls.
Dynamic Partition Manager mode
DPM is a new z Systems mode of operation that provides a simplified approach to create and
manage virtualized environments, reducing the barriers of its adoption for new and existing
customers.
The implementation provides built-in integrated capabilities that allow advanced virtualization
management on z Systems. With DPM, customers can use their existing Linux and
virtualization skills while using the full value of z Systems hardware, robustness, and security
in a workload-optimized environment.
DPM provides facilities to define and run virtualized computing systems, using a
firmware-managed environment, that coordinates the physical system resources shared by
the partitions. The partitions' resources include processors, memory, network, storage,
crypto, and accelerators.
DPM provides a new mode of operation for z Systems that provides these capabilities:
Facilitates defining, configuring, and operating PR/SM LPARs in a similar way to how
someone performs these tasks on another platform.
Lays the foundation for a general z Systems new user experience.
DPM is not an extra hypervisor for z Systems. DPM uses the existing PR/SM hypervisor
infrastructure and on top of it, provides an intelligent interface that allows customers to define,
use, and operate the platform virtualization without prior z Systems experience or skills. For
more information about DPM, see Appendix E, "IBM Dynamic Partition Manager" on
page 501.

3.7.2 Storage operations

In z13s servers, memory can be assigned as a combination of main storage and expanded
storage, supporting up to 40 LPARs. Expanded storage is used only by the z/VM operating
system.
Removal of support for Expanded Storage (XSTORE): z/VM V6.3 is the last z/VM
release that supports Expanded Storage (XSTORE) for either host or guest use. The IBM
z13 and z13s servers are the last z Systems servers to support Expanded Storage
(XSTORE).
All statements regarding IBM plans, directions, and intent are subject to change or
withdrawal without notice. Any reliance on these statements of general direction is at the
relying party's sole risk and will not create liability or obligation for IBM.
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