Releasing memory from z/VM is not supported. Releasing memory from the z/VM guest  depends on the guest’s operating system support. Linux on Z also supports acquiring and releasing memory nondisruptively. This feature is  enabled for SUSE Linux Enterprise Server 11 and RHEL 6 and later releases. On z13 servers, PR/SM is enhanced to support an option to limit the amount of physical  processor capacity that is used by an individual LPAR when a PU that is defined as a CP or  an IFL is shared across a set of LPARs. This enhancement is designed to provide a physical  capacity limit that is enforced as an absolute (versus a relative) limit. It is not affected by  changes to the logical or physical configuration of the system. This physical capacity limit can  be specified in units of CPs or IFLs. The supported operating systems are listed in Table 7-3 on page 248 and Table 7-4 on  page 249. The provisioning architecture enables clients to better control the configuration and activation  of the On/Off CoD. For more information, see 8.8, “Nondisruptive upgrades” on page 355.  The new process is inherently more flexible and can be automated. This capability can result  in easier, faster, and more reliable management of the processing capacity. The Capacity Provisioning Manager, which is a feature that is first available with z/OS V1R9,  interfaces with z/OS Workload Manager (WLM) and implements capacity provisioning  policies. Several implementation options are available, from an analysis mode that issues  only guidelines, to an autonomic mode that provides fully automated operations. Replacing manual monitoring with autonomic management or supporting manual operation  with guidelines can help ensure that sufficient processing power is available with the least  possible delay. The supported operating systems are listed in Table 7-3 on page 248. First available on System z9, program directed re-IPL allows an operating system on a z14 to  IPL again without operator intervention. This function is supported for SCSI and IBM  extended count key data (IBM ECKD) devices. The supported operating systems are listed in Table 7-3 on page 248 and Table 7-4 on  page 249. All IBM Z servers require a description of their I/O configuration. This description is stored in  I/O configuration data set (IOCDS) files. The I/O configuration program (IOCP) allows for the  creation of the IOCDS file from a source file that is known as the I/O configuration source  (IOCS). The IOCS file contains definitions of LPARs and channel subsystems. It also includes detailed  information for each channel and path assignment, each control unit, and each device in the  configuration. IOCP for z14 provides support for the following features: GLYPH<SM590000> New PCI function adapter for RoCE Express2 (CX4) GLYPH<SM590000> New PCI function adapter for zHyperLink (HYL) GLYPH<SM590000> z14 Base machine definition 264  IBM z14 (3906) Technical Guide IOCP Program-directed re-IPL Capacity Provisioning Manager LPAR group absolute capping