Chapter 8 Performing Pair Operations 8-23
Hitachi Universal Replicator for IBM /OS User’s Guide
Restoring a Pair of Data Volumes
The Resume Pair window (Figure 8-7) allows you to restore a pair that has
been split. In addition, the window allows you to recover a mirror and start
data copying of URz pair in Hold status in order to perform delta resync
operation.
Note:
If the primary or secondary storage system is powered off and its
backup batteries are fully discharged while pairs are suspended, the
primary/secondary data volume bitmaps will not be retained. In this unlikely
case, the primary/secondary storage system will mark all cylinders/tracks of
all suspended volumes as modified, so that the primary storage system will
perform the equivalent of an entire initial copy operation when the pairs are
resumed.
The administrator of the primary storage system can follow the procedure
below to restore one or more pairs that have been split, or to perform delta
resync operation. Note that the administrator of the secondary storage system
cannot perform the following operation.
1. Ensure that the Storage Navigator main window is in Modify mode.
For detailed information about how to do this, please refer to Storage
Navigator User’s Guide.
2. Ensure that the Pair Operation window is displayed.
3. If any pair was suspended due to an error condition (use the Detailed
Information window to view the suspend type), make sure that the error
condition has been removed. The primary storage system will not resume
the pair(s) until the error condition has been removed.
4. In the tree, select a CU image number.
5. In the list, select and right-click the pair that you want to restore.
The result of this operation differs according to the status of the selected
mirror.
– When you select the pair in Suspend status, the split pair will recover.
– When you select the pair in Hold status, delta resync operation will be
performed.
– When you select the pair in Hlde status, the status will change to Hold.
6. From the pop-up menu, select Resume Pair.
The Resume Pair window appears (
Figure 8-7).
7. In the Resume Pair window, select the desired options for the pair(s).
8. Select Set to close the Resume Pair window.
9. See the Preview list in the Pair Operation window to check the settings
that you have made.
