HP XP P9500 Storage - Manual (Page 47)

•
capacity-of-a-slot is expressed in kilobytes. The capacity of a slot depends on volume
emulation types (see “Calculated management area capacities” (page 50) ).
•
The resulting user area capacity is expressed in kilobytes.
To calculate the entire capacity of a CV:
ceil((user-area-capacity + management-area-capacity) /
boundary-value) * boundary-value / 1024
where
•
The value enclosed in ceil( ) must be rounded up to the nearest whole number.
•
user-area-capacity is expressed in kilobytes.
•
management-area-capacity is expressed in kilobytes. The management area capacity
depends on volume emulation types (see “Boundary values for RAID levels other than Enhanced
mode on SATA drives” (page 49) ).
•
boundary-value is expressed in kilobytes. The boundary value depends on volume emulation
types and RAID levels (see “Boundary values for RAID levels (enhanced data protection level
on SATA drives)” (page 49) ). 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
“Capacity of a slot” (page 49) ).
•
The resulting entire capacity is expressed in megabytes.
Calculating fixed-size open-systems volume size (CV capacity unit is blocks)
To calculate the user area capacity of a CV whose capacity unit is defined as blocks:
user-specified-CV-capacity / 2
where
•
user-specified-CV-capacity is expressed in blocks.
•
The resulting user area capacity is expressed in kilobytes.
To calculate the entire capacity of a CV:
ceil((user-specified-CV-capacity + management-area-capacity * 2)
/ (boundary-value * 2)) * (boundary-value * 2)
where
•
the value enclosed in ceil( ) must be rounded up to the nearest whole number.
•
user-specified-CV-capacity is expressed in blocks.
•
management-area-capacity is expressed in kilobytes. The management area capacity
depends on volume emulation types (see “Boundary values for RAID levels other than Enhanced
mode on SATA drives” (page 49) ).
•
boundary-value is expressed in kilobytes. The boundary value depends on volume emulation
types and RAID levels (see “Boundary values for RAID levels (enhanced data protection level
on SATA drives)” (page 49) ). 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
“Capacity of a slot” (page 49) ).
•
The CV capacity recognized by hosts is the same as the CV capacity calculated by the above
formula.
•
If block is selected as the LDEV capacity unit in the Create LDEVs window and dialog boxes,
the window and dialog boxes correctly show the calculated LDEV capacity. However, if MB,
GB, or TB is selected as the LDEV capacity unit in the Create LDEVs window and dialog boxes,
VLL size calculations 47