Figure 40 When Creating Multiple LDEVs in an External Volume
•When the emulation type is other than OPEN-V:
For details on the base LDEV capacity, the base data area capacity, and the control information area capacity, see “Required Volume Capacity for Each Emulation Type” (page 152).
◦If the capacity of the external volume is equal to or larger than the base LDEV capacity, specify the base data area capacity. Also, make sure that the capacity of the external volume is greater than or equal to the total capacity of the base LDEV capacity for all the LDEVs.
◦If the capacity of the external volume is smaller than the base LDEV capacity, create one LDEV the capacity of the external volume. Also, specify the value that is calculated by using the following equation:
LDEV capacity = 
(External volume capacity – Control information area capacity) 
Cylinder capacity 
× Cylinder capacity
The value enclosed in two downward arrows (
) must be rounded down to the nearest whole number.
Use the following numbers for the cylinder capacity:
–For 3380 mainframe volumes: 1,440 blocks
–For 3390 mainframe volumes: 1,740 blocks
–For open volumes other than
AddVolumeSetting2 Tag
Use the AddVolumeSetting2 tag to create one LDEV in an external volume without specifying the LDEV capacity. The created LDEV has the same capacity as the external volume. You can also use this tag when you use existing data in the external volume after mapping.
The LDEV is created with the following settings:
•LDEV capacity: the same capacity as the external volume
•Emulation type:
•Cache mode: Disable
•Inflow control: Disable
Table 21 (page 112) shows the parameters that can be set for the AddVolumeSetting2 tag.
Mapping External Volumes 111
