Getting error creating a new DB:
NAME db-name
ADDDS UNIT=3390 VOLSER=vvvvvv CYL=2000 BLKSIZE=8906 INDEX
SARDBI01 Index file allocation failed for db-name - ERROR=970C INFO=0000 DS=001
Using the parameter ABOVE in the ADDDS statement allowed the DB extent to be created in the extended area of the volume.
From documentation:
ABOVE
Indicates that the data set being added to the database can be allocated above the 64K cylinder line on a 3390-A device. Data sets that are allocated above the 64K cylinder line are allocated in increments of 21 cylinders so the final data set allocation is rounded up to the next multiple of 21 cylinders. This parameter is optional.