Formula for calculating capacity for 3390-A and 3390-V mainframe volumes

For 3390-A and 3390-V mainframe volumes, an expanded control information area of 7 cylinders (12,180 blocks) is required for every 1,113 cylinders (1,936,620 blocks). The area total includes the minimum or base data area and the control information area. Because you must be able to divide the entire LDEV capacity by 77,952 blocks, you must include an adjustment area in the LDEV capacity.

Formula for calculating necessary LDEV capacities (in blocks) :

ceil: rounding up the first decimal place to the nearest integer

Minimum LDEV capacity = ceil({ceil((Minimum data area capacity \ 
+ Control information area capacity) / 1,936,620) × 12,180 \ 
+ (Minimum data area capacity \
+ Control information area capacity)} / 77,952) × 77,952

LDEV capacity = ceil({ceil((Base data area capacity \ 
+ Control information area capacity) / 1,936,620) × 12,180 \ 
+ (Base data area capacity \
+ Control information area capacity)} / 77,952) × 77,952

Minimum LDEV capacity and Base LDEV capacity for mainframe systems