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: 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. 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. Table 3-6 Main storage definition and usage possibilities 132  IBM z14 (3906) Technical Guide 3.7.2 Storage operations 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. Image mode Architecture mode (addressability) Maximum main storage Architecture z14  definition General (formerly  ESA/390) z/Architecture (64-bit) 16 EB 4 TB Coupling facility CFCC (64-bit) 1.5 TB 1 TB Linux only z/Architecture (64-bit) 16 EB 2 TB z/VM a z/Architecture (64-bit) 16 EB 2 TB