Capacity Guidelines - HP StorageWorks XP24000 User Manual
External storage
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Capacity Guidelines
When a volume, which has the capacity of 4 TB or less, in the external storage system (external
volume) is mapped with the setting of OPEN-V emulation type, the volume is defined as the
internal volume that has the same capacity as the mapped external volume.
Figure 19 Example of External Volume of 4 TB or Less
You cannot access the data that is stored in the field over the maximum capacity of the external
volume.
The maximum volume capacity differs depending on the emulation type that you specify at
the external volume mapping. See
(page 147)
When an external volume is mapped as internal volumes with the setting of the emulation type
other than OPEN-V, the number of volumes and the volume capacity of the mapped external
volumes depend on the capacity of the original external volume and the basic capacity of
each emulation type. When an external volume is mapped with the setting of emulation type
other than OPEN-V, the data management information area is required to be provided in the
mapped volume. This means that the capacity that can be used after the mapping becomes
smaller than the actual external volume capacity. The available capacity decreases as much
capacity as the data management information area.
Figure 20 (page 40)
is bigger than the basic capacity of the emulation type. The emulation type is OPEN-3.
Figure 21 (page 40)
is smaller than the basic capacity of the emulation type.
HP Confidential
for more details.
shows an example of when the original capacity of the external volume
shows an example of when the original capacity of the external volume
"Required Volume Capacity for Each Emulation Type"
Guidelines for XP External Storage Operations
39
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