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Channel operation commands

 

Channel operation commands generally involve two stages. When the command syntax has been checked and the existence of the channel verified, a request is sent to the channel initiator, and message CSQM134I or CSQM137I is sent to the command issuer to indicate the completion of the first stage. When the channel initiator has processed the command, further messages indicating its success or otherwise are send to the command issuer along with message CSQ9022I or CSQ9023I respectively. Any error messages generated could also be sent to the z/OS console.

All cluster commands except DISPLAY CLUSQMGR, however, work asynchronously. Commands that change object attributes update the object and send a request to the channel initiator, and commands for working with clusters are checked for syntax and a request is sent to the channel initiator. In both cases, message CSQM130I is sent to the command issuer indicating that a request has been sent; this is followed by message CSQ9022I to indicate that the command has completed successfully, in that a request has been sent. It does not indicate that the cluster request has completed successfully. The requests sent to the channel initiator are processed asynchronously, along with cluster requests received from other members of the cluster. In some cases, these requests have to be sent to the whole cluster to determine if they are successful or not. Any errors are reported to the z/OS on the system where the channel initiator is running. They are not sent to the command issuer.

 

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