Calculating cv capacity for mainframe systems, Calculating cv capacity for open systems, Cv capacity by emulation type (open systems) – HP StorageWorks XP10000 Disk Array User Manual
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Table 25 CV capacity by emulation type (open systems)
Emulation type
Minimum CV capacity
(CYL)
Maximum CV capacity
(CYL)
Number of control
cylinders (Cyl)
OPEN-V
48,000 KB
3,019,898,880 KB (2.8125
TB)
0 KB (0 Cyl)
OPEN-3
36,000 KB (50 Cyl)
2,403,360 KB
5,760 KB (8 Cyl)
OPEN-8
36,000 KB (50 Cyl)
7,175,520 KB
19,440 KB (27 Cyl)
OPEN-9
36,000 KB (50 Cyl)
7,211,520 KB
19,440 KB (27 Cyl)
OPEN-E
36,000 KB (50 Cyl)
14,226,480 KB
13,680 KB (19 Cyl)
NOTE:
CVS functions are not applicable to OPEN-L volumes.
Calculating CV capacity for mainframe systems
When creating a CV, you can specify the CV's 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 capacity-of-a-slot ÷ 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
).
•
The boundary value is expressed in kilobytes. The boundary value depends on volume emulation
types and RAID levels (see
•
The slot capacity is expressed in kilobytes. The slot capacity depends on the volume emulation
types (see
Calculating CV capacity for open systems
When creating a CV, you can specify the CV's 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. The term “user area
capacity” refers to the capacity of areas in a CV that can contain user data.
If the emulation type is OPEN-V
The methods for calculating the CV's user area capacity and the entire capacity vary depending on the
CV capacity unit specified when creating the CV.
•
If the CV capacity unit is megabytes (MB):
To calculate the CV's user area capacity, 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
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Overview of Volume Manager and Custom Volume Size