Hitachi TrueCopy for z/OS user guide (December 2005)

TrueCopy for z/OS user guide 57
command (for example, CQUERY DEVN parameter). SI390 through Command View XP or XP Remote
Web Console displays the LDEV ID and SI390 pair status of all T-VOLs associated with an S-VOL.
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 21 TrueCopy and ShadowImage: shared M-VOL/S-VOL
Table 14 Host pair status reporting for TrueCopy/ShadowImage shared volumes
Number of
TC390 Pairs
Number of
SI390 T-VOLs
Pair Status Reported by XP128/XP1024/XP10000/XP12000
00 Simplex
0 1 SI390 pair status
0 2 or more ShadowImage pair status for the pair whose T-VOL has the lowest
LDEV ID
10 TC390 pair status
11 TC390 pair status
1 2 or more TC390 pair status
Table 15 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