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348 IBM System Storage DS6000 Series: Copy Services with IBM System z
You may also consider defining paths in the reverse direction. After a site failover and before
you return to the local site it may be necessary to resynchronize the volumes from the remote
site to the local site. This requires paths from the remote site to the local site. In contrast to
ESCON, FCP links allow the definition of paths in either direction over the very same link.
26.3.2 Establish Global Copy volume pairs
Create Global Copy pairs as the next step. TSO requires one PPRC CESTPAIR command
for each Global Copy pair to be established; see Example 26-9.
In the example, note that the ONLINSEC parameter is YES. It is recommended to leave this
parameter with its default value NO, which will avoid the situation where an active volume is
overridden by accident. With a value of NO, when the potential Global Copy secondary
volume is online to any system, the establish pair command will fail. When you specify YES,
the establish will happen independently of whether the potential secondary volume is online
or offline.
Example 26-9 Establish Global Copy volume pairs
//* ---------------------------- TSO ----------------------------- ***
//* ESTABLISH PPRC-XD PAIR(S) ***
//* -------------------------------------------------------------- ***
//EPAIR EXEC PGM=IKJEFT01
//SYSPRINT DD SYSOUT=*
//SYSTSPRT DD SYSOUT=*
//SYSTSIN DD DDNAME=SYSIN
CESTPAIR DEVN (X'2C00') +
PRIM (X'2C00' 27131 X'00' X'0C') +
SEC (X'3C00' 73081 X'00' X'0C') +
ONLINSEC(YES) MSGREQ(NO) CRIT(NO) +
OPTION(XD) MODE(COPY)
CESTPAIR DEVN (X'2D00') +
PRIM (X'2D00' 27131 X'00' X'0D') +
SEC (X'3D00' 73081 X'00' X'0D') +
ONLINSEC(YES) MSGREQ(NO) CRIT(NO) +
OPTION(XD) MODE(COPY)
CESTPAIR DEVN (X'2D01') +
PRIM (X'2D00' 27131 X'01' X'0D') +
SEC (X'3D00' 73081 X'01' X'0D') +
ONLINSEC(YES) MSGREQ(NO) CRIT(NO) +
OPTION(XD) MODE(COPY)
CQUERY DEVN (X'2C00')
CQUERY DEVN (X'2D00')
CQUERY DEVN (X'2D01')
Make sure the establish commands complete successfully and their initial copy phase starts.
For this you use a CQUERY command; see Example 26-10 on page 349.