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Defining Structured Infostorage Records › SYSID Concepts

SYSID Concepts

The SYSID is a string of one‑to eight‑ characters that group VMO records. You can define the content of the SYSID. Use the SYSID to group VMO records by system in a shared database environment. When you start CA ACF2 for VM, the SYSID you select remains in effect until you change it with the ACFSERVE SET SYSID command. The initial SYSID selection logic follows:

  1. Specify a SYSID in response to the CA ACF2 for VM startup prompt to set the startup SYSID during system startup. The format of this reply is SYSID(sysid). Any SYSID you enter is saved in the startup options file if RPROMPT or IPROMPT is YES.
  2. If you did not set the SYSID, CA ACF2 for VM uses the value specified in the ACFFDR @SYSID macro. If this value is null, CA ACF2 for VM uses the value defined in the SYSID macro HCPSYS.
  3. After system startup is complete, use the ACFSERVE SET SYSID command to change the current SYSID.

Under the CONTROL(VMO) setting of the ACF command, CA ACF2 for VM selects a SYSID for the session according to the following logic:

  1. When a user establishes the CONTROL(VMO) setting, CA ACF2 for VM selects the current CA ACF2 for VM SYSID string (obtained originally as described above) as the default SYSID for the session.
  2. Use the SYSID and MSYSID parameters of the ACF SET subcommand to change the session default. MSYSID is similar to SYSID, but indicates the use of SYSID masking. For example, you can start the system with a SYSID string of CPU1, but you can enter the following command to begin an ACF command session: 
    SET CONTROL SYSID(cpu2)

    As a result of this subcommand, the default SYSID becomes CPU2 for the duration of the CONTROL(VMO) setting.

    You can specify the SYSID or MSYSID parameter with any of the ACF subcommands under the CONTROL(VMO) setting (INSERT, CHANGE, LIST, and DELETE). These parameters override the SYSID default for the execution of that command only. For example, assume the default SYSID is CPU1 when you enter the following:

    CHANGE PSWD MINPSWD(5) SYSID(cpu2)

    The MINPSWD field change applies to the PSWD VMO record defined for CPU2, not for the VMO record defined for the system CPU1.

  3. The SHOW SYSTEMS subcommand displays the ACFFDR SYSID, STARTUP SYSID, and CURRENT SYSID.