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Safeguards tell the started task to add a candidate volume to a CA Compress VSAM data set the first time that the data set is accessed when CA Compress is running. If it is a non-SMS data set, the started task adds the candidate volume if it is not present. This candidate volume prevents the allocation of the compressed data set when the CA Compress subsystem is not active. When CA Compress is active, it monitors all VSAM Catalog Management requests (SVC 26 calls) and removes the candidate volume so the job can allocate, open, and access the data set. Because this is not done if the started task is not running, allocation fails at data set allocation time with the following messages to the operator:
The message states that the CA Compress volume (volume serial "@ZSAM@") is not available to the system. The operator must respond to this message by canceling the job and rerunning it after the CA Compress subsystem is activated.
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