IBM System storage DS6000 Series, Redbook

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Chapter 23. Global Mirror options and configuration
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Last but not least, if you did not already establish the FlashCopy relationship from B to C
during the Failover - Failback sequence at the remote site, then you have to do it now. This
may be an inband FlashCopy as shown in Figure 23-19.
A TSO command example is provided in Example 23-13.
Example 23-13 Establish FlashCopy from B to C via inband TSO command
//* ---------------------------- TSO ------------ CREATE (3) ----- ***
//* FLASHCOPY B -> C START CHANGE RECORDING NOCOPY ETC. THROUGH ***
//* MODE(ASYNC) OPTION (GET READY FOR GM) ***
//* -------------------------------------------------------------- ***
//* Inband Command 2C00 is Global Copy primary ***
//* LSS 0C CAA 00 is Global Copy secondary ***
//* and FlashCopy source ***
//* LSS 0D CAA 00 is FlashCopy target ***
//* -------------------------------------------------------------- ***
//FCESTBL EXEC PGM=IKJEFT01
//SYSPRINT DD SYSOUT=*
//SYSTSPRT DD SYSOUT=*
//SYSTSIN DD DDNAME=SYSIN
FCESTABL DEVN(X'2C00') SOURCE(73081 00 0C) +
TARGET(73081 00 0D) +
REMOTE(YES) SSID(3C00) MODE(ASYNC)
The last step is to start the Global Mirror session again, as shown in Figure 23-20. Then the
application may resume at the local site.
Figure 23-20 Start Global Mirror session and resume application I/O at the local site
Global Copy
Primary
Primary
A
Primary
Primary
A
Tertiary
C
Primary
Primary
A
Primary
Primary
A
B
Remote site Local site
Primary
Primary
A
Primary
Primary
A
A
Secondary
PENDING
Host
Primary
PENDING
Start session
FlashCopy