HP StorageWorks XP Remote Web Console Software - Manual (Page 179)

If a journal group is in Active status and you want to know whether any data volume pair in this
journal group is split, you must log in to the storage system containing the journal group, and then
display the Journal Operation window to check the status of the journal group. If any data volume
pair is split, the Journal Operation window displays the status of the journal group as
Active(Warning)
Registering Journal Groups in an Extended Consistency Group
To perform remote copy operations between more than one primary storage system and more than
one secondary storage system, you must register journal groups in an extended consistency group,
which is abbreviated as EXCTG.
•
Notes on configuring an extended consistency group:
You must confirm that the journal groups to be registered must be in Active or Stop status.
You must not register master and restore journal groups in the same extended consistency
group.
When the pairs are in cascading configuration that the SIz T-VOL and URz P-VOL share the
volume, the data consistency cannot be maintained when the data is copied between primary
and secondary storage systems even if you register the journal groups in the extended
consistency group.
When the pairs are in cascading configuration that the TCz R-VOL and URz P-VOL share the
volume, enable the time-stamp transferring option of all the TCz pairs in the journal group. If
the time-stamp transferring option is not enabled, the data consistency cannot be maintained
when the data is copied between primary and secondary storage systems, even if you register
the journal groups in the extended consistency group.
•
Configuring primary EXCTG:
You need to configure a primary EXCTG, because the primary EXCTG will be necessary if
you need to reverse the primary and secondary sites after a failure occurs. If you reverse the
copy direction when no primary EXCTG is configured, data update sequence will be maintained
on journal group basis, but not on extended consistency group basis.
For details on reversing copy direction, see Transferring Operations Back to the Primary Site .
•
Configuring secondary EXCTG:
You need to configure a secondary EXCTG when you use more than one primary storage
system and more than one secondary storage system. URz uses the secondary EXCTG to
maintains data update sequence of master journal groups that are paired with restore journal
groups in secondary EXCTG. If no secondary EXCTG is configured, data update sequence
will not be maintained, and data consistency will not be maintained between the primary
storage systems and the secondary storage systems.
To register journal groups in an extended consistency group:
1. Ensure that the XP Remote Web Console main window is in Modify mode.
For detailed information about how to do this, see XP Remote Web Console user’s guide.
2. Ensure that the EXCTG Operation window is displayed.
3. In the EXCTG Operation window ( “EXCTG Operation Window” (page 174) ), select and
right-click an extended consistency group in the tree or in the list.
4. Select Add JNLG to EXCTG from the pop-up menu.
The Add JNL Group window appears ( “Add JNL Group Window” (page 180) ).
5. If you do not want to register journal groups of the supervisor DKC, clear the check box of
far left of the DKCs (DKC-1 to DKC-4). To register journal groups of the supervisor DKC, select
the check box of far left of the DKCs (DKC-1 to DKC-4).
Registering Journal Groups in an Extended Consistency Group 179