Chapter 5. Using TotalStorage Productivity Center for Replication on Windows 2003 185
Now that the session is established and we have a consistent set of volumes we can suspend
and then recover the session copy sets to enable the H2 based volumes to be made
available. Figure 5-158 shows that the suspend command has been issued and the status
has changed to
Figure 5-158 Suspend status
Once the copy sets are in the suspended state we can issue the Recover command to make
the volumes in the copy sets available at the H2 site. This displays Figure 5-159.
Figure 5-159 Recover Global Mirror H2 volumes
186 IBM TotalStorage Productivity Center for Replication on Windows 2003
You can see in Figure 5-160 that after the recover action has been completed the H1 to J2
copy set is marked with a timestamp. This represents the time at which the last consistency
group was created. This is in essence your recovery point.
Figure 5-160 Timestamp at Global Mirror session suspend
Figure 5-161 displays that the volumes in the copy set become Target Available. This is the
point at which all the J2 volumes may be attached to your secondary hosts to enable your
recovery to be achieved.
Figure 5-161 Global Mirror Target volumes available
Chapter 5. Using TotalStorage Productivity Center for Replication on Windows 2003 187
Since this is a Failover / Failback scenario we may issue the Start H2-H1 to restart the copy
process in the reverse direction thus invoking a Failback copy. We can see in Figure 5-162 the
selection of the command from the drop-down menu.
Figure 5-162 Start H2 - H1
As we can see in Figure 5-163 the Start H2 - H1 command has been issued and the copy
sets are now preparing.
Figure 5-163 Start result
In Figure 5-164 on page 188 we show the copy sets for the H1-H2 definitions. We see that the
status is also
Preparing. Unlike the initial copy H1-H2 where the volumes moved to a
Prepared state the H2-H1 copy will always stay in a Preparing state.
188 IBM TotalStorage Productivity Center for Replication on Windows 2003
Figure 5-164 Copy sets
In Figure 5-165 we could once again check on the data exposure via the selection of the View
Data Exposure command from the drop-down menu.
Figure 5-165 Data Exposure
After some time you may want to complete the Failback of the site. This requires you to issue
the Suspend command again as we show in Figure 5-166 on page 189. The goal here is to
return processing to the primary site or H1 site.
Prior to the Suspend command you need to quiesce the server application I/O. This may be
through a server shut down or at least to shut down any applications using the server.