HP XP LUN Configuration and Security Manager Software - Manual (Page 43)

LUN Configuration and Security Manager XP user guide for the XP10000/XP12000 43
Table 16 shows specified and actual capacities of various open system custom volume sizes.
Calculating CV capacity for mainframe systems
When creating a CV, you can specify the CV capacity. However, there is a margin of error between the
user-specified CV capacity and the actual CV capacity. To estimate the actual CV capacity, use the
following formula. The resulting CV capacity is expressed in megabytes.
↑ (user-specified-CV-capacity + management-area-capacity) Ч 15 ч boundary-value ↑ ×
boundary-value ÷ 1024
NOTE:
•
Round up the value enclosed by two up arrows (↑) to the nearest whole number.
• The user-specified CV capacity is expressed in cylinders.
• The management area capacity is expressed in cylinders (see Table 17 on page 46).
• The boundary value is expressed in kilobytes. The boundary value depends on volume emulation types
and RAID levels (see Table 19 on page 46).
Calculating CV capacity for open systems
When creating a CV, you can specify the CV capacity. However, there is a margin of error between the
user-specified CV capacity and the actual CV capacity.
This section explains how to calculate the user area capacity and the entire capacity of a CV. The term
“user area capacity” refers to the capacity of areas in a CV that can contain user data.
Emulation type is OPEN-V
The methods for calculating the user area capacity and the entire capacity of a CV vary depending on the
unit for CV capacity that you specified when creating the CV.
• If the unit for CV capacity is megabytes (MB):
To calculate the user area capacity of a CV, use the following formula. The resulting user area capacity
is expressed in kilobytes.
↑↑ user-specified-CV-capacity Ч 1024 ч 64 ↑ ч 15 ↑ Ч 64 Ч 15
NOTE:
• Round up the value enclosed by two up arrows (↑) to the nearest whole number.
Table 16 Capacities of open system custom volume sizes
Setting size (MB) User size (MB) 1
1. The term user size refers to capacity available to users. User size does not include the number of control cylinders and the
number of cylinders for volume boundary control.
Notes
36 36.15625 Minimum custom volume size (other than OPEN-V)
46 48.875 Minimum custom volume size (OPEN-V)
500 500.625
1000 1000.546875
2000 2000.390625
2347 2347.03125 Maximum OPEN-3 volume size
7007 7007.34375 Maximum OPEN-8 volume size
7042 7042.5 Maximum OPEN-9 volume size
13893 13893.04688 Maximum OPEN-E volume size