HP P9000 Provisioning for Mainframe Systems User Guide (AV400-96369, October 2011)

drive, the boundary value depends on volume emulation types and RAID levels (see “Capacity
of a slot” (page 32))
• The resulting entire capacity is expressed in blocks. To convert the resulting entire capacity
into megabytes, divide this capacity by 2,048.
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:
ceil(user-specified-CV-capacity / 2)user-specified-CV-capacity / 2
ceil(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 (Enhanced mode
on SATA drives)” (page 32)).
• 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 32)). 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 32)).
• 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,
the capacity values shown might have a margin of error due to unit conversion reasons. If you
need to know the exact LDEV capacity, select block as the capacity unit.
• The resulting entire capacity is expressed in blocks. To convert the resulting entire capacity
into megabytes, divide this capacity by 2,048:
Calculating the size of a CV using Enhanced mode on SATA drives
If the data protection level is set to Enhanced mode on a SATA drive, the entire capacity of a CV
must be calculated. The calculation methods vary depending on the unit for the capacity specified
when creating the CV. These are required to be OPEN-V.
If the CV capacity unit is MB (megabytes):
To calculate the entire capacity of a CV whose capacity unit is defined as MB:
entire-capacity-of-a-CV * 1024 / capacity-of-a-slot
30 Configuring custom-sized provisioning