z/VM: CP Planning and Administration - z/VM - IBM

Configuring Your Systemv The defaults that will be used for querying other users’ POSIX databaseinformation and having their POSIX security values changedv The IODF that HCD will use to control CP’s I/O configuration.Note: You cannot define the size of system storage in the system configuration file.For information on defining the size of system storage to a value less thanwhat is actually available, see the STORE parameter under “Passing IPLParameters” on page 42.Contents of the System Configuration FileThe following sections contain a brief description of some of the statements thatyou can specify in the system configuration file. For complete descriptions of all thesystem configuration statements and general rules for coding a systemconfiguration file, see Chapter 6, “The System Configuration File,” on page 51.The Bare MinimumYou must include the following statements for the system to come up:v CP_OWNED defines a volume in the CP-owned volume list. After the system isrunning, you can use the DEFINE CPOWNED command to change this list. (Tomake the change permanent, update the system configuration file.)v SYSTEM_RESIDENCE specifies the location of the checkpoint and warm startareas.v OPERATOR_CONSOLE defines a list of console addresses from which CPshould choose the operator console.These three statements are all that the system really needs to come up and startrunning.Other Important StatementsYou may also want to include the following statements:v SYSTEM_IDENTIFIER and SYSTEM_IDENTIFIER_DEFAULT define systemidentifiers for the processors on which you run z/VM.v TIMEZONE_DEFINITION and TIMEZONE_BOUNDARY enable the system tochoose the correct local time zone definition.v IODF indicates that HCM and HCD will control the hardware and optionally thesoftware I/O configuration.Real DevicesThe statements previously listed are the most basic ones that you need to get yoursystem running and to give it an identifier and a local time. You can customize yoursystem further with the other statements. For example, if you are not using HCMand HCD to control your software I/O configuration, you can define real devices tothe system and establish characteristics for them using the following statements:v RDEVICE defines real I/O devices that do not respond to a sense ID request andI/O devices that need more defining information than a sense ID request returns(for example, printers and communications controllers). After the system isrunning, you can use the SET RDEVICE command to define or redefine realdevices.See Chapter 5, “Defining I/O Devices,” on page 45 for information about whichdevices may need to be defined with RDEVICE statements.v DEVICES tells CP whether to bring specified devices online, accept and buildreal device blocks for specified devices, and use the information returned from aChapter 2. Configuring Your System 25