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2-16 Chapter 3 Preparing for Universal Replicator z/OS Operations
Hitachi Universal Replicator for IBM /OS User’s Guide
15:00
14:00
13:00
12:00
15:02
14:02
13:02
12:02
15:03
14:03
13:03
12:03
15:04
14:04
13:04
12:04
Journal group 1
Extended consistency group
Journal group 2
Journal group 3
Journal group 4
indicates data that is to be restored to secondary data volumes
Legend:
indicates data that is not to be restored to secondary data volumes
Figure 2-4 Time Stamps of Data that Have Not Been Restored to
Secondary Data Volumes
Consistency time:
In the URz windows, consistency times of extended consistency groups,
journal groups, and data volume pairs are displayed. These consistency
times have the following meanings.
– The consistency time of an extended consistency group is the latest
time stamp of the restored data in the group in which consistency is
guaranteed.
In the example shown in
Figure 2-4, the consistency time of the
extended consistency group is 15:00.
– The consistency time of a journal group is the latest time stamp of the
restored data.
In the example shown in
Figure 2-4, the consistency times of journal
groups 1 to 4 are as follows.
• The consistency time of Journal group 1 is 15:00.
• The consistency time of Journal group 2 is 14:02.
• The consistency time of Journal group 3 is 14:03.
• The consistency time of Journal group 4 is 14:04.
– The consistency time of a data volume pair is the latest time stamp of
the data that has been restored when the pair becomes suspended.
In the example shown in
Figure 2-4, if a pair in the journal group 1, 2,
3 or 4 is suspended immediately after data are restored, the
consistency time of the pair will be as follows.
• If a pair in Journal group 1 is suspended, the consistency time will
be 15:00.
• If a pair in Journal group 2 is suspended, the consistency time will
be 14:02.
• If a pair in Journal group 3 is suspended, the consistency time will
be 14:03.