Hitachi ShadowImage for z/OS user guide (HIT9503-96007, October 2007)

ShadowImage for z/OS user guide 45
The configuration shown in Figure 17 is an example of a volume that is functioning as both an SIz S-VOL
and a URz S-VOL. This configuration allows you to use SIz to provide additional remote copies of URz
S-VOLs.
Figure 17 SIz and URz: Shared S-VOL/S-VOL
The configuration shown in Figure 18 is an example of a volume that 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
CAUTION: When you share an SIz S-VOL with a URz S-VOL as shown in Figure 3.8, 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.