Hitachi ShadowImage for z/OS user guide (HIT9503-96004, June 2006)

38 ShadowImage for the XP1024/XP128/XP12000/XP10000
The configuration shown in the following figure is an example of a volume that is functioning as both an
SI390 S-VOL and a TC390 R-VOL. With this configuration, you can use SI390 to provide additional remote
copies of TC390 M-VOLs.
Figure 11 SI390 and TC390: shared S-VOL/R-VOL
The configuration shown in the following figure is 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 SI390 to provide on-site backup copies of TC390 M-VOLs and R-VOLs.
• Use TC390 to provide remote backup of SI390 S-VOLs.
Figure 12 SI390 and TC390: shared S-VOL/M-VOL and S-VOL/R-VOL
The configuration shown in the following figure is an example of a volume functioning as both an SI390
T-VOL and a TC390 M-VOL.
NOTE: This configuration does not allow SI390 and TC390 to copy at the same time. Add the SI390 pair
first, and then split the pair before creating the TC390 pair. You must suspend the TC390 pair to resync the
SI390 pair. The TC390 pair status cannot be changed when the SI390 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
SI390 and TC390 shared configuration shown in the following figure, you must either use the PPRC
command to perform the Steady Split operation or use the Command View XP management station or XP
Remote Web Console 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, refer to ”Using PPRC Commands for ShadowImage” on page 71.
Figure 13 SI390 and TC390: shared T-VOL/M-VOL
Usually TCz and URz can share the volumes with SIz. However, in some cases, you cannot create SIz pairs
using the volume shared with TCz and URz. Figure 3.5 and Figure 3.6 show the examples of the cases that
you cannot create SIz pairs using the volume shared with TCz and URz.