The Write to Control Blocks function writes the mainframe system management area to an external volume.
If the LDEV with the mainframe system emulation type is created on the formatted external volume, it is recommended that the Write to Control Blocks is set to the format type. If the Write to Control Blocks is set to the format type, in comparison with the case of the Normal Format setting, the format time is shortened.
Before using this function, make sure that the external volumes have been formatted by the external storage system.
CAUTION:
When it is uncertain whether the external volume has been formatted by an external storage system, specify Normal Format to perform the format operation.
To format the following LDEVs, perform the Normal Format operation:
- LDEV which was accessed by hosts
- LDEV on which the Write to Control Blocks function was performed