Purpose
Causes TDP to begin communicating with a CP.
Syntax
where:
- cpname
- CP with which TDP is to communicate as IFPnnnn, where nnnn is the device number of the even-numbered CP device, in three or four hexadecimal digits.
- CIC
- Specification that this CP requires a communication protocol known as the Segment Protocol. All CPs for the DBC/1012 and CPs implemented by hardware known as an MCA have this requirement.
- CCU
- Specification that this CP requires a communication protocol known as the Structure Protocol. All CPs using ESCON and CPs implemented by hardware known as an EBCA have this requirement.
Usage Notes
The START CP command must be executed for at least one CP before TDP can accept any requests from applications.
Once executed, the START CP command initiates processing that implicitly ATTACHes (establishes a logical and a physical attachment between) the CP to TDP, if the CP was not previously ATTACHed
The devices for a CP can be either explicitly or dynamically allocated. Dynamic allocation is the more usual operation since no explicit allocation is required: TDP automatically allocates the required devices. Explicit allocation requires that the following be performed prior to STARTing the CP:
| If using this operating system . . . | Do the following . . . |
|---|---|
| z/OS VOS3 |
Include two DD statements in the JCL procedure that is used to start TDP. The DD statements should be in this format: //IFP nnnn DD UNIT= nnn One of these statements is for the even CP device number, the other for the corresponding odd CP device number. If a four-digit device number is specified for the UNIT keyword, z/OS requires that a slash precede the digits, as in UNIT=/nnnn |
For either operating system, IFPnnnn corresponds to the cpname used in the START command. IFPnnn and IFP0nnn are equivalent. That is, the command can specify one form and the static system definition can specify the other.
If you issue the START CP command immediately after a STOP CP command, the CP must complete the stop process before it can start again.
Example: START IFP
STA IFP490
Completion Message
IFP490 SUCCESSFULLY STARTED