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The implementation provides built-in integrated capabilities that allow advanced virtualization management on IBM Z servers. With DPM, you can use your Linux and virtualization skills while taking advantage of the full value of IBM Z hardware, robustness, and security in a workload optimized environment. 

DPM provides facilities to define and run virtualized computing systems by using a firmware-managed environment that coordinate the physical system resources that are shared by the partitions. The partitions’ resources include processors, memory, network, storage, crypto, and accelerators. 

DPM provides a new mode of operation for IBM Z servers that provide the following services: 

GLYPH<SM590000> Facilitates defining, configuring, and operating PR/SM LPARs in a similar way to how someone performs these tasks on another platform. 

GLYPH<SM590000> Lays the foundation for a general IBM Z new user experience. 

DPM is not another hypervisor for IBM Z servers. DPM uses the PR/SM hypervisor infrastructure and provides an intelligent interface on top of it that allows customers to define, use, and operate the platform virtualization without IBM Z experience or skills. For more information about DPM, see Appendix E, “IBM Dynamic Partition Manager” on page 501. 

## 3.7.2 Storage operations 

In z14 servers, memory can be assigned as main storage only (expanded storage is not supported) supporting up to 85 LPARs. Before you activate an LPAR, main storage must be defined to the LPAR. All installed storage can be configured as main storage. Each z/OS individual LPAR can be defined with a maximum of 4 TB of main storage. z/VM V6R3 support 1 TB while z/VM V6R4 and z/VM V7R1 support 2 TB of main storage. 

Main storage can be dynamically assigned to expanded storage and back to main storage as needed without a POR. 

Memory cannot  be shared between system images. It is possible to dynamically reallocate storage resources for z/Architecture LPARs that run operating systems that support dynamic storage reconfiguration (DSR). This process is supported by z/OS, and z/VM. z/VM, in turn, virtualizes this support to its guests. For more information, see 3.7.5, “LPAR dynamic storage reconfiguration” on page 135. 

Operating systems that run as guests of z/VM can use the z/VM capability of implementing virtual memory to guest virtual machines. The z/VM dedicated real storage can be shared between guest operating systems. 

The z14 storage allocation and usage possibilities, depending on the image mode, are listed in Table 3-6. 

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