Differential Management Logical Units

NOTE: This topic is intended for maintenance technicians or qualified users. Contact Hitachi Data Systems customer support if you have any questions regarding this feature.

This help page provides information to guide you through the tasks or managing differential management logical units (DMLU). It contains the following topics:

Overview (back to top)

DMLUs are logical units that consistently maintain the differences between them. They use Navigator 2 storage features such as ShadowImage and SnapShot. These features manage logical units in pairs. In each pair, one logical unit is a replication of the other. To control a pair of logical units, the array needs to maintain and manage differences between the two logical units.

Using DMLUs (back to top)

In the explorer tree, select Settings > DMLU. A list of DMLUs is displayed in a table. The data in the table is described here.

Item	Description
Port	This field displays the names of the ports in the selected array
LUN	This is the name of the Logical unit that is assigned to a DMLU
Capacity	This is the capacity of the DMLU in GB.
Status	This is the status of the DMLU. The status is displayed in the same way as the status of a logical unit.

Adding a DMLU (back to top)

To assign a logical unit to a DMLU:

Click Add DMLU. The ADD DMLU dialog box is displayed.
Select a pair of logical units from the logical unit candidates list by selecting the to the left of the logical unit names.
Click OK. A message dialog indicating that the selected logical units are assigned as DMLU is displayed.
Click Close button. The dialog disappears and the list of DMLUs should reflect the change.

Removing a DMLU (back to top)

To remove a DMLU:

Select one or two DMLUs by placing a check in the .
Click Remove DMLU button. A message dialog indicating that the selected DMLUs have been removed is displayed.
Click Close button. The dialog disappears and the list of DMLUs should reflect the result.