Hitachi TrueCopy for z/OS User Guide (T1711-96024, November 2011)

Hitachi TrueCopy for z/OS user guide 63
The following figures show the various TC390/ShadowImage configurations that share volumes. TC390
supports synchronous and asynchronous operations for shared volumes. The following figure shows an
example of a volume that is functioning as both a TC390 M-VOL and a ShadowImage S-VOL. With this
configuration, you can:
• Use TC390 to provide remote backup copies of SI390 S-VOLs.
• Use SI390 to provide on-site backup copies of TC390 M-VOLs.
Figure 20 TrueCopy and ShadowImage: shared M-VOL/S-VOL
The following figure shows an example of a volume that is functioning as both a TC390 R-VOL and an
SI390 S-VOL. With this configuration, you can use SI390 to provide additional remote copies of TC390
M-VOLs. This configuration is not allowed when At-Time Split is used on SI390.
Figure 21 TrueCopy and ShadowImage: shared R-VOL/S-VOL
The following figure shows an example of a volume that is functioning as both a TC390 M-VOL and an
SI390 S-VOL, while the R-VOL of the same TC390 pair is also functioning as the S-VOL of another SI390
pair. With this configuration, you can:
• Use TC390 to provide remote backup of SI390 S-VOLs.
0 2 or more ShadowImage pair status for the pair whose T-VOL has the lowest
LDEV ID
1 0 TC390 pair status
1 1 TC390 pair status
1 2 or more TC390 pair status
Table 18 Data currency of a shared TrueCopy/ShadowImage volume
TC390
Pair Status
ShadowImage Pair Status
Pending
Duplex
Duplex Split-Pending Split Resync Suspended
Pending Duplex Not current Not current Not current CURRENT Not current Not current
Duplex Not current Not current Not current CURRENT Not current Not current
Suspended Not current CURRENT CURRENT CURRENT CURRENT Not current
Table 17 Host pair status reporting for TrueCopy/ShadowImage shared volumes (continued)
Number of
TC390 Pairs
Number of
SI390 T-VOLs
Pair Status Reported by XP12000/XP10000