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

ShadowImage for z/OS user guide 113
When you use FlashCopy® Mirror Version 2 S-VOL as the TCz R-VOL, configure the system as follows.
• Connect different hosts to main subsystem and remote subsystem, or connect the host of main subsystem
to both main and remote subsystem.
• Use the fibre channel interface to connect main subsystem with remote subsystem.
NOTE: This configuration differs from the system configuration that is used when IBM FlashCopy Version 2
and PPRC are used in conjunction.
Typically, when IBM FlashCopy Version 2 and PPRC are used in conjunction, you need a DFSMS command
or a TSO command when you use FlashCopy® Mirror Version 2 and TCz.Note that the procedures differ
depending on whether FlashCopy® Mirror Version 2 is used in conjuction with TCz Synchronous or TCzA.
Using a DFSMS command
Use the following procedure when a DFSMS command is used and FlashCopy® Mirror Version 2 S-VOL
and TCzA R-VOL are shared. However, if the status of the TCz Synchronous pair is duplex, you need to use
a TSO command. In addition, for details about the DFSMS to create a FlashCopy® Mirror Version 2 pair,
see ”DFSM Command Supported by Compatible Mirroring for IBM FlashCopy Version 2”.
1. If you need to terminate the I/O operation to the volumes of TCz Synchronous pairs in order to
maintain the consistency of data, terminate the I/O operation.
2. Suspend the TCzA pair. See the following example:
CSUSPEND DEVN(X dev#') PRIM(X ssid' cmd_param X cca X lss) SEC(X ssid' serial# X cca X lss)
TCzA M-Vol
OK OK OK
R-Vol No
1
No
1
OK
1
You cannot create the FlashCopy® Mirror Version 2 pair since the
data consistency of the FlashCopy® Mirror Version 2 T-VOL will not
be insured.
2
If you create a FlashCopy® Mirror Version 2 pair with the FREEZE
option when FlashCopy® Mirror Version 2 S-VOL and TCz
Synchronous R-VOL are shared, the results of FlashCopy® Mirror
Version 2 operations and TCz Synchronous operations will be as
follows:
• Results of FlashCopy® Mirror Version 2 operations
When the status of TCz Synchronous pair is Suspend, the
command will end normally and you can create a FlashCopy®
Mirror Version 2 pair. However, when the status of TCz
Synchronous pair is either Duplex of Pending duplex, the
command will be rejected and you cannot create a FlashCopy®
Mirror Version 2 pair.
• Results of TCz Synchronous operations
If a FlashCopy® Mirror Version 2 pair is created with the FREEZE
option, and when a TCz Synchronous R-VOL is in extended long
busy (ELB) status, the command to create or resume a pair will be
rejected. However, the command to suspend or delete a pair will
be executed normally.
Table 53 Volume Share of FlashCopy® Mirror Version 2 S-VOL and TCz
Shared TCz Pair Volume Status of TCz Pair
Duplex Pending
Duplex
Suspend