HP XP P9500 Storage - Manual (Page 37)

Calculating the size of a mainframe volume
To calculate the entire capacity of a CV, use the following formulas. For the
user-specified-CV-capacity
, specify the capacity of the user area in a CV. The resulting
CV capacity is expressed in megabytes:
ceil(ceil(user-specified-CV-capacity + management-area-capacity)
* 15 * capacity-of-a-slot / boundary-value)
* boundary-value / 1024
To calculate the CV capacity by cylinders, use the following formula:
ceil(ceil(user-specified-CV-capacity + management-area-capacity)
* 15 * capacity-of-a-slot / boundary-value)
* boundary-value / capacity-of-a-slot / 15
•
The value enclosed in ceil( ) must be rounded up to the nearest whole number.
•
The user-specified-CV-capacity is the capacity of the user area in a CV expressed
in cylinders.
•
The management-area-capacity is expressed in cylinders (see “Management area
capacity of a mainframe volume” (page 39) ).
•
The boundary-value is expressed in kilobytes. The boundary-value depends on volume
emulation types and RAID levels (see
“Boundary values for RAID levels (other than Enhanced
mode on SATA drives)” (page 39) ). If the data protection level is set to the Enhanced mode
on a SATA drive, the boundary value depends on volume emulation types and RAID levels
(see
“Boundary values for RAID levels (Enhanced mode on SATA drives)” (page 39) ).
•
The capacity-of-a-slot is expressed in kilobytes. The capacity of a slot value depends
on volume emulation types (see
“Capacity of a slot” (page 40) ).
When calculating the size of a mainframe volume, note the following:
•
To calculate the capacity of the CV of 3390-A, apply the multiples of 1,113 cylinders to
user-specified CV capacity
in the upper formula. For instance, if you want to apply
1 cylinder to user-specified CV capacity, apply 1,113 cylinders. If you want to apply
1,114 cylinders to user-specified CV capacity, apply 2,226 cylinders.
To calculate the capacity of the CV of 3390-V, apply the multiples of 44.8 cylinders to
user-specified CV capacity
in the upper formula. For instance, if you want to apply
44 cylinder to user-specified CV capacity, apply 44.8 cylinders. If you want to apply
45 cylinders to user-specified CV capacity, apply 89.6 cylinders.
•
In 3390-A, for the Compatible FlashCopy SE volume, if you specify a value between 1 and
40,068 cylinders, the space whose size is the sum of the specified value and 252 cylinders
for the control cylinders is required. If you specify a value of 40,069 cylinders or more, the
free space calculated by the following formula is required.
40,320 cylinders + the value rounded up after the decimal point of *A ×
1,120 cylinders
where *A = (the specified value - 40,068) ÷ 1,113 cylinders
•
In 3390-A, if a value is specified in Remote Web Console in the Create LDEVs window that
exceeds 65,520 cylinders, the value is corrected to multiples of 1,113 cylinders. For instance,
if 65,521 is specified, 65,667 which is 59 times 1,113 cylinders appears.
•
In 3390-V, the value specified in the Create LDEVs window is corrected to multiples of 44.8
cylinders (38,976 KB) and rounded down to the nearest whole number of cylinders.
VLL size calculations 37