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Chapter 3 Preparing for Universal Replicator z/OS Operations 3-27
Hitachi Universal Replicator for IBM /OS User’s Guide
Business Continuity Manager allows you to set the starting time of backup
copy to journal groups. In the above configuration, if you set the starting time
of backup copy, the writes to the primary data volume up to that time will be
backed up to the secondary data volume. If the above configuration is used in
multiple journal volumes in multiple disk subsystems, you can set the same
starting time of backup copy to all the journal groups. If you do this operation,
the primary data volumes will be backed up across the multiple disk
subsystems at the same time.
• URz/SIz configurations which share the URz secondary data volume and
SIz P-VOL
Figure 3-9 shows an example of a URz secondary data volume which is also
functioning as a SIz S-VOL. This configuration allows you to use SIz to
provide multiple backup copies of a single URz primary data volume.
URz
SIz
MCU
RCU
Primary data
volume
Master journal
volume
S-VOL
Secondary
data volume
Restore journal
volume
T-VOL
Figure 3-9 Shared URz secondary data volume and SIz S-VOL
Caution: If you use a URz secondary data volume as an SIz S-VOL as
shown in
Figure 3-9, the write operation to the URz primary data volume
takes time. Especially, when the SIz pair is in the V-Split status, the write
operation to the URz primary data volume may takes extra time according
to the time for copying process of the SIz pair.
In addition, note that if the journal volume size is small, the URz pair may
be suspended by failure because of the shortage of the capacity of its
journal volume.
Business Continuity Manager allows you to set the starting time of backup
copy to journal groups. In the above configuration, if you set the starting
time of backup copy, the writes to the primary data volume up to that time
will be backed up to the secondary data volume. If the above configuration
is used in multiple journal volumes in multiple storage systems, you can
set the same starting time of backup copy to all the journal groups. If you
do this operation, the primary data volumes will be backed up across the
multiple storage systems at the same time.
• URz/SIz configuration which share the UR primary data volume and SIz S-
VOL, and UR secondary data volume and SIz S-VOL