HP P9000 Provisioning for Open Systems User Guide (AV400-96396, October 2011)

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
where
• capacity-of-a-slot is expressed in kilobytes. The capacity of a slot depends on volume
emulation types (see “Capacity of a slot” (page 49)).
• The resulting entire capacity is expressed in slots.
To calculate the management area capacity:
ceil(entire-capacity-of-a-CV(slots) /
calculated-management-area-capacity) * boundary-value
where
• the value enclosed in ceil( ) must be rounded up to the nearest whole number.
• calculated-management-area-capacity depends on volume emulation types and
RAID levels (see “Management area capacity of an open-systems volume” (page 49)).
• The resulting entire capacity is expressed in slots.
To calculate the entire capacity of a CV if the data protection level is set to the Enhanced mode
on the SATA drive:
ceil(entire-capacity-of-a-CV(slots) +
calculated-management-area-capacity)
To convert the resulting entire capacity into megabytes:
calculated-entire-capacity-of-a-CV(slots) /
1024 * capacity-of-a-slot
where
• calculated-entire-capacity-of-a-CV(slots) means the entire capacity of a CV
if the data protection level is set to the Enhanced mode on the SATA drive.
If the CV capacity unit is block:
To calculate the entire capacity of a CV whose capacity unit is defined as block:
calculated-entire-capacity-of-a-CV(slots) /
1024 * capacity-of-a-slot
where
• capacity-of-a-slot is expressed in kilobytes. The capacity of a slot depends on volume
emulation types (see “Capacity of a slot” (page 49)).
• The resulting entire capacity is expressed in slots.
To calculate the management area capacity:
ceil(entire-capacity-of-a-CV(slots) /
calculated-management-area-capacity ) * boundary-value
48 Configuring custom-sized provisioning