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When the capacity of the external volume is less than the base LDEV capacity
of the emulation type, one Custom-sized Volume (CV) is created in the
external volume as you map the volume. When the capacity of the external
volume is more than the base LDEV capacity of the emulation type, the
external volume is divided into multiple LDEVs, each of which have the base
LDEV capacity. Because the OPEN-V emulation type supports 4TB of the
volume at the maximum, one LDEV is always created when the external
volume is mapped.
If you use the VLL function, you can divide the mapped external volume into
2,048 CVs at the maximum as your demand. However, the LDEVs as they are
mapped are used for the OPEN-L emulation type, because the VLL function is
not applicable to the OPEN-L emulation type.
When the capacity of the mapped external volume is more than the maximum
capacity of the specified emulation type, a certain part of external volume
cannot be used. Table B-1 shows the maximum usable capacity of the external
volume of each emulation type. For detailed information about the volume
capacity for each emulation type, see Table B-3.
Table B-1
OPEN-V
OPEN emulation type other than
OPEN-V
3380 mainframe emulation type
3390 mainframe emulation type
Figure B-1 shows the relationship of the minimum LDEV capacity, base LDEV
capacity, minimum data area capacity, base data area capacity, and control
information area capacity.
Figure B-2 shows how to figure out the volume capacity using the example of
the OPEN-3 case.
B-2
Hitachi Universal Storage Platform V/VM Universal Volume Manager User's Guide
Maximum Usable Capacity of External Volume
Emulation Type
Required Volume Capacity for each Emulation Type
Maximum Usable Capacity of External Volume
4 TB (8,589,934,592 blocks)
767.99GB
(1,610,612,640 blocks)
767.99GB (1,610,612,640 blocks)
927.99GB (1,946,156,940 blocks)
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