gtpo1m0j | Operations |
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 |
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