HP XP Racks - Manual (Page 19)

Determining capacity for mainframe volume other than 3390-A and 3390-V
For mainframe volumes other than 3390-A and 3390-V, 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 the entire
LDEV capacity should be divided by 77,952 blocks, an adjustment area is also required.
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
Base LDEV capacity (blocks) Minimum LDEV capacity (blocks) Emulation type
2,026,752 155,904 3390-1
3,975,552 155,904 3390-2
Planning external volumes 19