can help simplify migration from one release to another, facilitate the transition to newer applications, provide a test system whenever one is needed, and consolidate several to provide virtual access to the latest DASD and processor architecture for systems that lack such support. New tech- nological enhancements in z/VM 4.4 provide:

Exploitation of the zSeries 890 and 990 server

Extending Dynamic-I/O confi guration support allows channel paths, control units, and devices to be dynamically added, changed, and deleted in a Logi- cal Channel SubSystem (LCSS) environment.

Support for extended I/O measurement facilities provides improved capacity planning and I/O perfor- mance measurement

Handling I/O confi guration defi nition and dynamic I/O confi guration in an environment of up to 30 LPARs, an increase from the previous limit of 15

Support for the zSeries capability to cascade two FICON directors within a Fibre-Channel fabric. z/VM and its guests can take advantage of this enhanced and simpli- fi ed connectivity, which is particularly useful in disaster- recovery and business-continuity situations.

Support for the IBM TotalStorage Enterprise Storage Server (ESS) FlashCopy V2 providing increased fl exibil- ity for improved capacity management and utilization

Support for the IBM ESS Peer-to-Peer Remote Copy Extended Distance (PPRC-XD) function, extending the distance, well beyond the 103 km supported with PPRC synchronous mode. PPRC-XD is suitable for data migra- tion, backup, and disaster recovery procedures. PPRC Version 2 (V2) is also supported for guest operating

systems, offering an asynchronous cascading solution providing a complete, consistent, and coherent copy of data at a remote site.

Support for IBM TotalStorage Enterprise Tape Controller 3592 Model J70 and Tape Drive 3592 Model J1A

Systems Management

Improvements in systems management, some of which help to provide self-confi guring, self-managing, and self- optimizing facilities in z/VM V4.4 include:

Functions that may be called by client applications to allocate and manage resources for guests running in z/VM virtual machines (virtual images). Use of the application programming interfaces (APIs) through an application provided by a customer or solution provider are designed so that such applications can allow administrators who lack in-depth VM knowledge to manage a large number of virtual images, running in a single z/VM system.

Hardware Confi guration Manager (HCM) and Hardware Confi guration Defi nition (HCD) components to create and manage your I/O confi guration. This new support provides a comprehensive, easy-to-use I/O-confi gura- tion-management environment similar to that available with the z/OS operating system.

Performance Toolkit for VM that provides enhanced capabilities for a z/VM systems programmer, operator, or performance analyst to monitor and report performance data. The toolkit is an optional, per-engine-priced feature derived from the FCON/ESA program (5788-LGA), pro- viding:

full-screen mode system console operation and man- agement of multiple z/VM systems

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IBM z/OS manual Systems Management