HP XP1024 System Configuration Manual page 55

Notes for disk parameters
1.
The value of pc is calculated as follows:
pc = nc
The nc of OPEN-x CVS corresponds to the capacity specified by SVP or remote
console.
The CVS size of OPEN-x is specified by capacity (megabyte), not by number of
cylinders.
The number of cylinders of an OPEN-x CVS volume can be obtained by the
following calculation (↑ ↑means round up to integer).
The number of cylinders = ↑ (specified capacity in megabytes from SVP or remote
console) × 1,024 / 720 ↑.
Example
2.
The value of pa must be equal to or more than 131,072.
3.
The number of cylinders of a Logical Unit Size Expansion (LUSE) composed of
OPEN-x CVS volumes corresponds to the capacity specified by the SVP or the
remote console. CVS size of OPEN-x is specified by the capacity (megabytes), not
by the number of cylinders. The number of cylinders of the OPEN-x CVS volume
can be obtained by the following calculation (↑ ↑ means round up to integer):
The number of cylinders = ↑ (specified capacity in megabytes from SVP or remote
console) × 1,024 / 720 ↑ × n
where n is the number of concatenated volumes for LUSE.
Example
nt ns
When 37 MB is specified for an OPEN-3 CVS volume from SVP,
the number of cylinders of the OPEN-3 CVS can be
calculated as follows:
37 × 1,024 / 720 = 52.62
↑52.62↑ = 53
The OPEN-3 CVS volume has 53 cylinders.
When 37 MB is specified for the OPEN-3 CVS volume and the
four volumes are concatenated, the number of cylinders of
the OPEN-3 CVS can be calculated as follows:
↑37 × 1,024 / 720↑ × 4 = ↑52.62↑ × 4 = 53 × 4 = 212
The LUSE for the OPEN-3 CVS volume has 212 cylinders.
Disk Array XP operating system configuration guide: IBM AIX
55