HP Hitachi ShadowImage for Mainframe User Guide (T5213-96032, November 2011)

In addition, note that in the case of TCzA, the TCz pair may be suspended by failure because of
the shortage of the capacity of its side file.
Figure 12 (page 31) is an example of a volume, which is functioning as both a TCz M-VOL and
an 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 ShadowImage for Mainframe to provide on-site backup copies of TCz M-VOLs and R-VOLs,
and/or
• Use TCz to provide remote backup of SIz S-VOLs.
Figure 12 SIz and TCz: Shared S-VOL / M-VOL and S-VOL / R-VOL
Figure 13 (page 31) shows a volume functioning as both an SIz T-VOL and a TCz M-VOL.
Figure 13 SIz and TCz: Shared T-VOL/M-VOL
The configuration in Figure 13 (page 31) does not allow SIz and TCz to copy at the same time.
Add the SIz pair first, and then split the pair before creating the TCz pair. You must suspend the
TCz pair in order to resynchronize the SIz pair. The TCz pair status cannot be changed when the
SIz pair is in the V-Split status.
You cannot distinguish the Split status from the V-Split status with the PPRC command. When you
use the SIz and TCz shared configuration shown in Figure 13 (page 31), you must either use the
PPRC command to perform the Steady Split operation, or use the Remote Web Console computer
Hitachi TrueCopy™ for Mainframe 31