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Figure 3-2
Figure 3-3
Guidelines for Mainframe Volumes
•
If you plan to use the mapped external volume from the mainframe OS
(e.g., the volume is mapped with the setting of 3390-x mainframe
emulation type), you need to select the external volume that consists of
one LDEV or you need to adjust the capacity of the external volume to be
mapped beforehand.
•
If multiple LDEVs exist in one external volume and if a lot of I/Os are made
to these LDEVs, the read, write commands may become timeout. When the
commands become timeout, the SIM (21D2xx) is reported.
Hitachi Universal Storage Platform V/VM Universal Volume Manager User's Guide
External Volume
6 GB
Free Space
(The area less than the basic
capacity of emulation type
remains as free space)
When the External Volume Capacity is Bigger than the
Basic Capacity of Specified Emulation Type (Example of
the OPEN-3 emulation type)
External Volume
2 GB
When the External Volume Capacity is Smaller than the
Basic Capacity of Specified Emulation Type
Preparing for Universal Volume Manager Operations
VDEV
LDEV
Area provided to store data
management information
VDEV
LDEV
Area provided to store data
management information
LU
OPEN-3
LU
3-9
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