HP XP P9500 Storage - Manual (Page 38)

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 based on the previously calculated entire capacity of a CV. The calculation
methods vary depending on the unit for the capacity specified when creating the CV.
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 40) ).
•
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.
•
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:
user-specified-a-CV-capacity / 2 / 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 40) ).
•
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.
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 blocks:
calculated-entire-capacity-of-a-CV(slots) * capacity-of-a-slot * 2
38 Configuring custom-sized provisioning