Initialize a SCRATCH or UNKNOWN volume as MEMBER1 of the mirrored volume set PROD_SET for LDEVS 30 and 31:
:VOLUTIL
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volutil: NEWMIRRSET PROD_SET MEMBER1 (30,31)
*Verify: Initialize new volume set PROD_SET on ldev 30 and ldev 31 [Y/N]? Y
Note*: New master volume has been initialized for ldev 30 and ldev 31.
NOTE: After executing the NEWMIRRSET command, you should execute a :VSCLOSEvolsetname and a :VSOPENvolsetname to ensure that the volume set information has been posted to the disk.