Hitachi TrueCopy for IBM z/OS User and Reference Guide (T5211-96001, June 2007)

2-60 About TrueCopy for z/OS Operations

Hitachi Universal Storage Platform V TrueCopy for IBM z/OS User’s Guide

Figure 2-6 shows an example of a volume which is functioning as both a TCz R-VOL and a SIz S-

VOL. This configuration allows you to use ShadowImage for z/OS to provide additional remote

copies of TCz M-VOLs.

SIz

TCz

S-VOL

T-VOL

M-VOL R-VOL

Figure 2-6 TrueCopy for z/OS and ShadowImage for z/OS: Shared R-

VOL/S-VOL

Figure 2-7 shows an example of a volume which is functioning as both a TCz M-VOL and a SIz S-

VOL, while the R-VOL of the same TCz pair is also functioning as the S-VOL of another SIz pair.

This configuration allows you to:

• Use TrueCopy for z/OS to provide remote backup of SIz S-VOLs, and/or

• Use ShadowImage for z/OS to provide on-site backup copies of TCz M-VOLs

and R-VOLs.

SIz

TCz

SIz

S-VOL

T-VOL

S-VOL

T-VOL

M-VOL R-VOL

Figure 2-7 TrueCopy for z/OS and ShadowImage for z/OS: Shared M-

VOL/S-VOL and R-VOL/S-VOL

Figure 2-8 shows an example of a volume functioning as both a TCz M-VOL and a SIz T-VOL.

Note: This configuration does not allow SIz and TCz to copy at the same time. Create the SIz

pair first, and then split the pair before creating the TCz pair. You must suspend the TCz pair

in order to resync the SI pair.