HP XP P9500 Storage - Manual (Page 48)

•
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 50) ).
•
boundary-value is expressed in kilobytes. The boundary value depends on volume emulation
types and RAID levels (see “Boundary values for RAID levels (Enhanced mode on SATA drives)”
(page 50) ). 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 50) ).
•
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 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. 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 50) ).
•
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
48 Configuring custom-sized provisioning