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

2-26 About ShadowImage™ for IBM
®
z/OS
®
Operations
Hitachi ShadowImage™ for IBM
®
z/OS
®
User’s Guide
TCz R-VOL
Storage system 2
Storage system 1
SIz S-VOL
SIz T-VOL
TCz M-VOL
TrueCopy
for z/OS
ShadowImage
for z/OS
Figure 2-13 SIz and TCz: Shared T-VOL/M-VOL
Notes:
– The configuration of Figure 2-13 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 resync
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 2-13, you must either use the PPRC command to
perform the Steady Split operation, or use the Storage Navigator
computer to confirm the pair statuses. You can perform the Steady Split
operation by specifying the CSUSPEND parameters (Byte 7 = ‘M’, Byte
8 = ‘P’, Byte 9 = ‘S’). For details about the PPRC commands, please see
Chapter 7.
Universal Replicator for z/OS
URz volumes can be assigned to SIz pairs, and SIz volumes can be assigned to
URz pairs.
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.
ShadowImage for z/OS and Universal Replicator for z/OS can function together
in the same storage system to provide both internal and remote backup for
your important data.
• To query the status of an SIz pair when SIz and URz pairs share the same
volume, do the following: