IBM Objectives Describe how CP commands are used

IBM ^ Objectives Describe how CP commands are used and structured Explain the importance of the VM Dump Tool and VM Virtual LANs List and describe the important and most useful CP commands © 2004 IBM Corporation

IBM ^ Control Program (CP) It provides each user with an individual working virtual machine environment Every virtual machine is a functional equivalent of a real system, sharing: Processor functions Storage Console I/O device resources It provides connectivity support to exchange information and access resources © 2004 IBM Corporation

IBM ^ Real-Machine Resource Manager CP is a real-machine resource manager Handles real machine hardware interrupts and all intercepts Schedules certain real I/O operations Manages: – Real storage – Expanded storage – Auxiliary storage CP is the only way to communicate with the real resources on your virtual machine © 2004 IBM Corporation

IBM ^ Read/Punch/Print © 2004 IBM Corporation

IBM ^ Cross-System Extension (CSE) Allows multiple systems to be coupled together in a complex that provides CSE Cross-system link extends the existing CP minidisk access protocols Allows Single System Image © 2004 IBM Corporation

IBM ^ CSE Capabilities © 2004 IBM Corporation

IBM ^ Overview of Setting up a CSE Complex 1. Provide the hardware connections between the processors 1. Install the IBM VM/Pass-Through Facility (licensed program) 1. Configure z/VM and the supporting programs with the information they need to run the CSE complex © 2004 IBM Corporation

IBM ^ Using CSE as a Hot Backup … Heart. Beat © 2004 IBM Corporation

IBM ^ Inter-System Facility for Communications (ISFC) is a function of CP It enables communications between programs written to: APPC/VM Communication Services (CS), which is a group of interconnected VM systems that uses ISFC to communicate with each other Specific programming interfaces: IUCV © 2004 IBM Corporation

IBM ^ The Three Types of Virtual Machines The three types of VMs are defined by their storage configurations V=R – CP provides best performance benefits for the VM and it must begin at location 0 V=F – Also provides performance benefits but does not have to start at location 0 V=V – It does not map the host storage; it pages guest real storage into and out of the host real storage © 2004 IBM Corporation

IBM ^ Real Storage in z/VM © 2004 IBM Corporation

IBM ^ Real Storage in z/VM cont. © 2004 IBM Corporation

IBM ^ Preferred Virtual Machines V=R & V=F Similarities Store information in the real location Are mapped into contiguous real storage Can have dedicated real processors Have similar I/O interpretations and simulation for shared devices V=R & V=F Differences V=F can have more than one virtual machine running, while V=R can only run one virtual machine V=F does not start at absolute V=R must start at absolute 0 zero V=R has better performance because it does less table translation than V=F © 2004 IBM Corporation

IBM ^ Using CP Commands z/VM uses the CP command language to configure, tune and manipulate resources To control the resources of the real machine – Processors – I/O devices – Networking devices To control your virtual machine’s configuration and environment © 2004 IBM Corporation

IBM ^ CP Command Structure z/VM’s CP command lines contain a command name and a positional operand Command names are: – Alphanumeric and less than 12 characters long – Verbs that describe the function Operands are: – Keywords and symbols 8 characters or less in length – Not required on some commands © 2004 IBM Corporation

IBM ^ CP Command Truncations and Abbreviations Truncations: Shorter form created by dropping one or more letters from the end of the command or operand The uppercase letters in the syntax diagram must remain, but lowercase letters can be omitted For use: the QUERY command we could Query Full name que Truncation Abbreviations: Shorter form of command names They appear below the full name of the command in the syntax diagram Operand abbreviations are displayed in the operand description For the MESSAGE command we could use: Message Full Name Msg Abbreviation q Shortest truncation © 2004 IBM Corporation

IBM ^ CP Control Tools: VM Guest LAN Virtual Adapters Simulated by a NIC, such as Hiper. Sockets and OSA-Express devices Can be operated by a guest using the same software that would be used to control the equivalent hardware Connectivity for Virtual Adapters Enables VM users to connect virtual network adapters to an emulated LAN When connected to this virtual LAN, users can communicate over a physical LAN segment © 2004 IBM Corporation

IBM ^ CP Control Tools: VM Dump Tool © 2004 IBM Corporation

IBM ^ CP Commands © 2004 IBM Corporation

IBM ^ Privilege Class Revisited © 2004 IBM Corporation

IBM ^ ATTACH © 2004 IBM Corporation

IBM ^ ATTACH © 2004 IBM Corporation

IBM ^ DEFINE The DEFINE command can change your system configuration and allows you to add new commands and setups to your system Usage Notes: You can suppress messages from this command by entering SET IMSG OFF Using the DEFINE command to alter the configuration of your virtual machine is temporary. Your configuration returns to its original state at the end of the session Using the DEFINE command for I/O configuration is also temporary, unless you update you I/O configuration program file to make the changes permanent © 2004 IBM Corporation

IBM ^ DEDICATE © 2004 IBM Corporation

IBM ^ DEDICATE – Usage Notes Defaults for DEDICATE are: – CPU ALL – User ID of the V=R machine If there are more virtual processors then real processors, the lowest virtual addresses are dedicated first. Order is not important for CPU and USER. It is possible to have your dedicated processor become undedicated when some commands are issued after DEDICATE. This can be avoided if you enable automatic dedication. © 2004 IBM Corporation

IBM ^ INDICATE For privilege Class G, it displays: Recent contention for system resources Environment characteristics of your virtual machine Measurements of resources used by your virtual machine For privilege Class E (sometimes B or C) it displays: Detailed information on the use of system resources The status of currently active virtual machines Environment characteristics and measurements of resources used by any virtual machine © 2004 IBM Corporation

IBM ^ MESSAGE The MESSAGE command: Transmits messages to the virtual console of other active users Has the format Message userid messtosend Usage Notes: Messaging length in the CP environment is limited by the input area of the terminal The SET MSG OFF command suppresses messages Messages are displayed only when the display device is ready to receive output If MSG ALL AT ALL is entered in a CSE, every user in every system receives the message © 2004 IBM Corporation

IBM ^ VARY (Real Device) © 2004 IBM Corporation

IBM ^ VARY – Usage Notes: If you specify a list of devices, the summary at the end will list the devices that were varied online or offline If your devices were varied online, but a success status does not appear and no errors occurred, use the FORCE operand to bring them online The test operand provides the ability to use VARY for a device that would not normally be allowed by CP © 2004 IBM Corporation

IBM ^ Conclusion CP manages the resources of a single computer so that multiple computing systems appear to exist CSE and ISFC help CP work with other virtual machines to create an interconnected environment Virtual Machines can be set up to run in many different environments, such as V=V, V=R, and V=F CP-supported facilities show z/VM can be modified and extended by the CP commands © 2004 IBM Corporation

IBM ^ Glossary Cross System Extensions (CSE)- allows users in up to four interconnected VM systems to participate in a multi-system environment. Inter-System Facility for Communications (ISFC)- provides communications facilities between transaction programs on interconnected z/VM systems. Programmed Operator Facility (PROP)- allows remote control of a virtual machine, enabling limited automation of routine operator activities © 2004 IBM Corporation

IBM ^ Glossary Dynamic Paging Area (DPA)- part of the real storage that CP uses for virtual machine pages. . . the real page pool Operands- keywords and symbols that affect command functions. Command names- verbs that describe command functions. In z/VM, they are alphanumeric and less than 12 characters long. Truncations- shorter forms constructed by dropping one or more letters from the end of a command or operand name Abbreviations- short versions of command names © 2004 IBM Corporation

IBM ^ Glossary Asynchronous Data Mover Facility (ADMF)- can offload page move activity onto the I/O processor, freeing the instruction processor Complementary Metal Oxide Semiconductor (CMOS)- a chip technology used almost universally for processors today Cryptography- an effective means of protecting data in computers and communication systems from unauthorized disclosure ESCON- a set of products and services that use optical fiber technology and dynamically modifiable switches called ESCON Directors © 2004 IBM Corporation

IBM ^ Glossary Fiber optic cables- reduce cable bulk, allowing for an increase in the amount of distance between processors and attached devices, and improved data transfer rates FICON- a fiber optic I/O architecture that coexists with and exploits existing ESCON equipment and infrastructure, but offers improved link performance and enhanced distance connectivity Fast Synchronous Data Mover (FSDM)- replaces ADMF on the G 5/G 6 and all later processors © 2004 IBM Corporation