Subsystem Activation and Operation › Using Operator Commands › STOP Command

STOP Command

The STOP (P) command is used to terminate the CA Compress subsystem:

P ZSAMT

However, avoid using the STOP command to force CA Compress to terminate while compressed data sets are being accessed. Doing so can result in data corruption, and is quite likely to cause 0C4 abends, which can be disastrous in online systems. To protect you when compressed data sets are open,
CA Compress issues warning messages and requires the requestor to confirm that CA Compress should stop. To stop the VPE component without stopping CA Compress, submit the batch job $VPEOUT provided in the CA Compress JCL distribution file.

When the STOP (P) command is issued, CA Compress checks if compressed data sets are being accessed, and:

• If no compressed data sets are being accessed, CA Compress terminates as requested.
• If compressed data sets are being accessed, CA Compress writes a message to the operator. The message gives the number of data sets being accessed, and requests that the STOP command be entered again. To terminate CA Compress, the operator must reissue the STOP command within one minute.
• System termination takes about one minute and should be permitted to run to completion. If you cancel the task while cleanup is in progress, abends and other problems can require an IPL to correct.