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Performing Universal Volume Manager Operations 5-11
Hitachi Universal Storage Platform V/VM Universal Volume Manager User’s Guide
• Number of LDEVs
You can select the maximum number of LDEVs which can be created in the
external volume when you map the external volume. The number of LDEVs
that can be created in the external volume is different corresponding to the
capacity supported by the emulation type specified in the Emulation Type.
The number of LDEVs which are actually created in the external volume is
displayed in the Number of LDEVs column in the Add Volume dialog box
after you set this parameter in the Set External Volume Parameter dialog
box.
• Cache mode
Cache mode specifies if the write data from the host is propagated
synchronously (Disable) or asynchronously (Enable) to the external
storage system. Data that is not written by the host (for example, data
written by ShadowImage) is asynchronously destaged to the external
storage system regardless of the Cache Mode setting.
If you set Disable, the bind mode of Cache Residency Manager cannot be
set.
• Inflow Control
Inflow Control specifies if the writing operation to the cache memory is
stopped (Enable) or continued (Disable) when the writing operation to
the external volume is impossible.
• CLPR
When the cache memory is partitioned using Virtual Partition Manager, you
can select CLPR used for accessing to the mapped external volume from
the drop-down list. The number of SLPR to which the selected CLPR
belongs is displayed at the right of the drop-down list. However, when the
emulation type for the mainframe is selected in Emulation Type, you can
only select CLPR that belongs to SLPR number 0.
• OK button
Saves the settings and closes the dialog box.
• Cancel button
Cancels the settings and closes the dialog box.
LDEV Mapping (Auto) Dialog Box
The LDEV Mapping (Auto) dialog box allows you to specify the LDEV number
only to the first LDEV in the external volume. If you specify the LDEV number
to the first LDEV, the subsequent LDEV numbers are automatically assigned
for the rest of LDEVs.