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308 IBM System Storage DS6000 Series: Copy Services with IBM System z
The inband modality is used when the remote site is not connected to the local site. DEVN
refers to the primary volume, and SOURCE and TARGET refer to remote storage disk
subsystem. MODE(ASYNC) implicitly includes the specific FlashCopy attributes that are
required for Global Mirror.
24.3.5 Define a Global Mirror session
Before adding volumes to the Global Mirror session, a token is required under which the
session can be identified and addressed.
Figure 24-6 Define a Global Mirror session number
Figure 24-6 shows a volume within an LSS. This LSS contains the Global Copy primary
volumes that are going to be part of the Global Mirror session. At the moment it is
recommended to use some kind of utility device within each LSS, for addressing purposes.
This utility device needs to be online to the z/OS system where you execute the Global Mirror
commands. You may consider using a volume that will not be part of the Global Mirror
session, but within the same LSS where the Global Copy primary volumes will be.
Example 24-15 TSO command example to define a Global Mirror session
//* ---------------------------- TSO ------------ CREATE (4) ----- ***
//* DEFINE GM SESSION NUMBER X'01' TO LSS X'0C' AND LSS X'0D' ***
//* -------------------------------------------------------------- ***
//DEFSESS EXEC PGM=IKJEFT01
//SYSPRINT DD SYSOUT=*
//SYSTSPRT DD SYSOUT=*
//SYSTSIN DD DDNAME=SYSIN
RSESSION SNBR(01) VOLSER(XX2C00) +
ACTION(DEFINE) +
LSSTYPE(CKD) LSSNBR(0C) +
ESSSERIAL(27131) +
MSSERIAL (27131)
RSESSION SNBR(01) VOLSER(XX2D00) +
ACTION(DEFINE) +
LSSTYPE(CKD) LSSNBR(0D) +
ESSSERIAL(27131) +
MSSERIAL (27131)
LCU: 3C00
LCU: 2C00
A
FlashCopy
LCU: 3E00
C
3E00
Secondary
B
3C00
PENDING.XD
01
Define Global Mirror session
Primary
PENDING.XD
logical paths connecting LSSs