gtpo1m0jOperations

Control Program Keypoint Records

The system configuration is specified in keypoint records. The keypoints are defined by DSECTs and are assembled. These records are used to initialize the system during restart and their file copy is updated whenever the core image counterparts are modified by the control program or by a command program.

Table 1. Control Program Keypoints

Keypoint Macro Name Function Processor SS Initialized By Residency Demand Keypointable
Record A (CTKA) CK1KE Contains information required for system loading and for the initializer program. Unique Unique SIP File No
Record B (CTKB) CK9KC Miscellaneous initialization and restart values, for example, clock status, VFA status, and DASD error thresholds. Unique Unique SIP Main storage Yes
Record C (CTKC) CK8KE Status of Computer Room Agent Set (CRAS) attached terminals, initial Routing Control Application Table (RCAT) and Terminal Address Table (WGTA) control information. Shared Shared SIP Main storage No
Record D (CTKD) CK7KE Status used by the synchronous link programs. Unique Shared SIP Main storage Yes
Record E (CTKE) CK6KE Describes the non-SNA communications network. Unique Shared SIP File No
Record I (CTKI) IC0CK Describes the status of all processors in a loosely coupled complex of the HPO feature. Shared Shared SIP File No
Record M (CTKM) MK0CK Describes the status of each subsystem and each subsystem user. Shared Shared SIP Main storage No
Record V (CTKV) IDSCKV Contains volume serial number ranges for the online modules, the copy module, and the loader general file. Shared Unique SIP File No
Record 0 (CTK0) CK0KE Contains legal disk hardware addresses. Shared Shared SIP File No
Record 1 (CTK1) CK2KC Contains the Tape Status Table (TSTB). Unique Shared N/A Main storage Yes
Record 2 (CTK2) CK2SN Contains all the information in the system about the SNA configuration and the TCP/IP device parameters. Unique Shared Source, contains no SIP provided inputs Main storage No
Record 3 (CTK3) None This keypoint is available for customer use. Unique Shared Customer File No
Record 4 (CTK4) VK4CK This keypoint is available for customer use. Shared Unique Customer File No
Record 5 (CTK5) None This keypoint is reserved for IBM use. Shared Shared N/A File No
Record 6 (CTK6) CJ6KP Contains the DASD module status indicators. Shared Unique SIP File and main storage (see note 1) No
Record 9 (CTK9) CY1KR Contains the status of the DASD pools. Shared Unique Source, contains no SIP provided inputs Main storage No
Note:
  1. The entire keypoint is file-resident; the first section of the keypoint is also main-storage-resident.
  2. Processor shared means that there is one copy of the keypoint for all processors in a loosely coupled environment.
  3. Processor unique means that there is one copy of the keypoint per processor in a loosely coupled environment.
  4. Subsystem (SS) shared means that there is one copy of the keypoint residing in the BSS in an MDBF environment.
  5. Subsystem (SS) unique means that there is one copy of the keypoint per subsystem in an MDBF environment.