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

About TrueCopy for z/OS Operations 2-59
Hitachi Universal Storage Platform V TrueCopy for IBM z/OS User’s Guide
Table 2-16 Host Pair Status Reporting for TCz/SIz Shared Volumes
Number of
TCz Pairs
Number of SIz T-VOLs
Pair Status Reported by USP V
0 0 Simplex
0 1 SIz pair status
0 2 or more SIz pair status for the pair whose T-VOL has the lowest LDEV ID
1 0 TCz pair status
1 1 TCz pair status
1 2 or more TCz pair status
Table 2-17 Data Currency of a Shared TCz/SIz Volume
SIz Pair Status TCz Pair
Status
Pending Duplex SP-Pend V-Split Split Resync Resync-R Suspend
Pending Not current Not current Not current Not current CURRENT Not current -- Not current
Duplex Not current Not current Not current Not current CURRENT Not current -- Not current
Suspend Not current CURRENT CURRENT CURRENT CURRENT CURRENT CURRENT Not current
Figure 2-5 through Figure 2-8 show the various TCz/SIz configurations which
share volumes. TCz supports synchronous and asynchronous operations for
shared volumes. Figure 2-5 shows an example of a volume which is
functioning as both a TCz M-VOL and a SIz S-VOL. This configuration allows
you to:
• Use TCz to provide remote backup copies of SIz S-VOLs, and/or
• Use SIz to provide on-site backup copies of TCz M-VOLs.
TCz
SIz
S-VOL
T-VOL
M-VOL R-VOL
Figure 2-5 TrueCopy for z/OS and ShadowImage for z/OS: Shared M-
VOL/S-VOL