HP StorageWorks XP Remote Web Console Software - Manual (Page 191)

Figure 83 Storage Systems in the EXCTG Operation Window
• JNLG: Indicates journal group numbers. A journal group number is a two-digit hexadecimal
number.
• Mirror ID: Indicates the mirror ID of a journal group.
• Attribute: Indicates the attribute of a journal group.
A master journal group
A restore journal group
• Status: Indicates the status of a journal group.
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
If you want 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.
• 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 ” on page 198.
• 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, please refer to XP Remote Web Console User’s Guide.
2. Ensure that the EXCTG Operation window is displayed.
3. In the EXCTG Operation window ( Figure 79 on page 187), select and right-click an extended
consistency group in the tree or in the list.
Hitachi Universal Replicator for z/OS user guide for XP12000/XP10000 Disk Arrays and SVS 200 191