Hitachi ShadowImage for IBM z/OS User"s Guide (T5213-96002, June 2007)

About ShadowImage™ for IBM
®
z/OS
®
Operations 2-29
Hitachi ShadowImage™ for IBM
®
z/OS
®
User’s Guide
Caution: When you share an SIz S-VOL with a URz S-VOL as shown in Figure
2-15, the write operation to the URz P-VOL takes time. Especially, when the
SIz pair is in the V-Split status, the write operation to the URz P-VOL 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.
Caution: When you share an SIz S-VOL with a URz S-VOL as shown in Figure
2-15, Quick Restore or Reverse Copy can not be executed. The command will
be rejected if executed.
The configuration shown in Figure 2-16 is an example of a volume, which is
functioning as both a URz P-VOL and an SIz S-VOL, while the S-VOL of the
same URz pair is also functioning as the S-VOL of another SIz pair. This
configuration allows you to:
• Use ShadowImage for z/OS to provide on-site backup copies of URz P-VOLs
and S-VOLs, and/or
• Use URz to provide remote backup of SIz S-VOLs.
URz S-VOL
SIz S-VOL
SIz T-VOL
Storage system 2
Storage system 1
URz P-VOL
SIz S-VOL
SIz T-VOL
Universal Replicator for z/OS
ShadowImage
for z/OS
ShadowImage
for z/OS
Legend:
SIz S-VOL:
SIz T-VOL:
URz P-VOL:
URz S-VOL:
SIz source volume
SIz target volume
URz primary data volume
URz secondary data volume
Figure 2-16 SIz and URz: Shared S-VOL/P-VOL and S-VOL/S-VOL
The configuration shown in Figure 2-17 is an example of a volume which is
functioning as both an SIz T-VOL and a URz P-VOL. This configuration allows
you to use URz to provide remote copies of SIz T-VOLs.