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Controlling the Model9 VDEV

The Model9 VDEV started task (STC), usually called M9VDEV, is responsible for intercepting certain I/O operations related to the virtual devices of the Model9 Cloud Data Sets, such as handling VARY ONLINE and VARY OFFLINE for those devices.
The Model9 VDEV STC accepts two operator commands:
  1. 1.
    STOP
  2. 2.
    MODIFY

STOP command

Use the STOP command (P M9VDEV) to shut down the Model9 VDEV.
When the STOP M9VDEV command is issued, the system responds as follows:
Message
Description
ZM9IC039I STOP COMMAND ACCEPTED, SHUTTING DOWN ZM9IC041I MODEL9 VDEV SHUTDOWN COMPLETE
The Model9 VDEV stop command is accepted and it's now shut down
ZM9IC017E STOP COMMAND REJECTED, ONE OR MORE VDEV DEVICES ARE STILL ONLINE
One or more devices are still online thus the Model9 VDEV STOP command is rejected
ZM9IC011E STOP COMMAND REJECTED, OTHER STARTIO HOOK INSTALLED AFTER VDEV, DISABLE VDEV OR REMOVE OTHER HOOK FIRST
Another application is intercepting the z/OS STARTIO after the Model9 VDEV. Disable the Model9 VDEV using the MODIFY command or remove the other application first
ZM9IC028W STOP COMMAND ACCEPTED, SHUTTING DOWN WITH PARTIAL RESOURCE CLEANUP
ZM9IC041I MODEL9 VDEV SHUTDOWN COMPLETE
Another application is intercepting the z/OS STARTIO after the Model9 VDEV, but the VDEV was disabled with the MODIFY command. The Model9 VDEV is shut down with partial resource cleanup

MODIFY command

The MODIFY command accepts the following parameters:
  • MODIFY M9VDEV,DISABLE The command disables the Model9 VDEV interception and will allow stopping the VDEV in cases where other applications are intercepting the z/OS STARTIO after the Model9 VDEV. Issuing the command could result in one of the following:
Message
Description
ZM9IC072E VDEV MODIFY REJECTED, DEVICES ARE STILL ONLINE
One or more devices are still online thus the Model9 VDEV MODIFY command is rejected
ZM9IC073I STARTIO INTERCEPTION SUCCESSFULLY DISABLED
The Model9 VDEV is disabled successfully. It is now possible to stop the Model9 VDEV successfully
Unsupported command parameters would result in the following message: ZM9IC015E MODIFY COMMAND REJECTED, UNKNOWN COMMAND