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

2-30 About ShadowImage™ for IBM

z/OS

Operations

Hitachi ShadowImage™ for IBM

z/OS

User’s Guide

S-VOL

SIz pair T-VOL

URz pair P-VOL

Storage system 1

Storage system 2

Universal Replicator 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 2-17 SIz and URz: Shared T-VOL/P-VOL

Note: In the configuration shown in Figure 2-17, you cannot perform the SIz

and URz copy operations at the same time. In Figure 2-17, first you need to

create and split the SIz pair, then create the URz pair. If you want to

resynchronize the SIz pair, suspend the URz pair beforehand. Note that you

cannot change the URz pair status while the SIz pair is in V-Split status.

TrueCopy for z/OS and Universal Replicator for z/OS

Usually TCz and URz can share the volumes with SIz. However, in some cases,

you cannot create SIz pairs using the volume shared with TCz and URz. Figure

2-18 and Figure 2-19 show the examples of the cases that you cannot create

SIz pairs using the volume shared with TCz and URz.

Note:

A primary volume (P-VOL) of Universal Replicator for z/OS means a

primary data volume of Universal Replicator for z/OS. A secondary volume (S-

VOL) of Universal Replicator for z/OS means a secondary data volume of

Universal Replicator for z/OS.

The configuration shown in Figure 2-18 is an example of a volume functioning

as both a URz S-VOL and a TCz M-VOL. In this configuration, you cannot use

this volume as the S-VOL of an SIz pair.