Guidelines For Mainframe Volumes - HP StorageWorks XP24000 User Manual
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Figure 20 When the External Volume Capacity is Bigger than the Basic Capacity of Specified
Emulation Type (Example of the OPEN-3 emulation type)
Figure 21 When the External Volume Capacity is Smaller than the Basic Capacity of Specified
Emulation Type
Guidelines for Mainframe Volumes
If you plan to use the mapped external volume from the mainframe operating system (for
example, 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 time out. When
the commands may time out, the SIM (21D2xx) is reported.
When you use the mapped external volume from the mainframe operating system, set the MIH
(Missing Interrupt Handler) timer to 45 seconds (which is the recommended value).
Volume Attribute Guidelines
The external volume attributes for all the LDEVs created in an external volume become the
same. The attributes are taken over, when the LDEVs are reconfigured using the VLL function.
The Cache Mode becomes the same for all the LDEVs in one external volume.
The attributes that are set for the external volume originally on the external storage system
side (such as the port security, the LUN security, the Volume Retention Manager attributes,
and so on) are not kept, when the external volume is mapped as an internal volume. If the
original attributes are required to be set, set the attributes on the mapped external volume
from the local storage system side.
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Preparing for XP External Storage Operations
HP Confidential
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