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4-8 Using the Universal Volume Manager GUI
Hitachi Universal Storage Platform V/VM Universal Volume Manager User’s Guide
– Capacity (blocks): capacity of the external volume in Blocks.
– Cache Mode: displays whether the write data from the host to the
external storage system is propagated synchronously (Disable) or
asynchronously (Enable). 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.
– Inflow Control: displays whether the writing operation to the cache
memory is stopped (Enable) or continued (Disable) when the writing
operation to the external volume is impossible.
– Path Mode: Indicates how the cross-subsystem paths work. The
displayed modes of the cross-subsystem path are as follows:
– Single: For the Single mode, the only cross-subsystem path with
the highest priority (primary path) is used to execute the I/O to the
external volume. When an error occurred in the primary path, the
path with the second highest priority is used.
– Multi: For the Multi mode, all of the cross-subsystem paths that
you configured are used at the same time. The multiple paths are
used to execute the I/Os to the external volume distributing the
work load.
– Ext. VOL Info: information about the external volume. When the
external volume is an SATA drive of the TagmaStore AMS/WMS storage
system or the Thunder 9500V series storage system, “ * ” is displayed.
For the operation of the SATA drive, follow the method of the
TagmaStore AMS/WMS or Thunder 9500V storage system.
– Ext. VOL Status: status of the operation executed to the external
volume or status of the connection of the mapping path. For the
displayed status descriptions, see
Table 4-3. To check status of each
LDEV in the external volume, you need to view the VLL window.
– Progress: displays when the Status is Cache Destage. The progress
status of destaging processing is displayed in 1 % to 99 %.
– Characteristic2: extended identification number of the external
volume. This information is used for identifying volumes in the EVA
storage system.
• Cross-subsystem Paths
The following items are displayed:
– Priority: Priority of the cross-subsystem paths. “1” indicates the cross-
subsystem path with the highest priority.
– Port: The port number in the local storage system connecting to the
external storage system.
– WWN: Identification number of the port in the external storage system.
• Pop-up Menu
Right-click a row in the External Volumes (at the top of the window) to
perform the following operations from the pop-up menu.