HP StorageWorks XP Remote Web Console Software - Manual (Page 83)

Figure 22 on page 83 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 22 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 22 on page 83, 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
Figure 23 on page 83 combines the configurations shown in Figure 21 on page 82 and
Figure 22 on page 83. Within a single URz pair, the primary data volume and secondary data volume
are both functioning as SIz S-VOLs, providing multiple copies at the primary and secondary sites.
URz
SIz
MCU RCU
SIz
T-VOL
Master journal
volume
T-VOL
Secondary
data volume
Primary data
volume
S-VOL
Restore
journal volume
S-VOL
Figure 23 Shared URz Primary Data Volume and SIz S-VOL, and URz Secondary
Data Volume and SIz S-VOL
• URz/SIz configuration where a SIz T-VOL in Split status is used as a URz primary data volume
Hitachi Universal Replicator for z/OS user guide for XP12000/XP10000 Disk Arrays and SVS 200 83