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352 IBM System Storage DS6000 Series: Copy Services with IBM System z
26.3.6 Start Global Mirror session
The last step is to start the Global Mirror session. This will start forming Consistency Groups
at the remote site. Also with this command, you are appointing the Master LSS.
Example 26-15 shows the TSO command RSESSION, but this time with the
ACTION(START) parameter option. As this parameter option implies, the microcode now
starts to create Consistency Groups at the secondary storage disk subsystem. Again, an
online volume in VOLSER is required on the system where this job executes.
With the START option you can also provide the session with tuning values other than the
default values. Here we decided to continuously create Consistency Groups. The maximum
drain time window is set to 10 minutes. The maximum application impact time is set to 5
milliseconds, at the beginning of the process of forming a new Consistency Group.
Example 26-15 Start Global Mirror session
//* ---------------------------- TSO ------------ CREATE (6) ----- ***
//* START SESSION X'01' THROUGH LSS X'0C' ***
//* ***
//* THEN LSS X'0C' BECOMES THE MASTER LSS (DS) ***
//* NOTE: LSS SYNTAX IS WITHOUT X AND QUOTES ... ***
//* ***
//* CGINTERVAL - BUILD CG WITHOUT A BREAK ***
//* CGDRAIN - ALLOW 10 MINUTES FOR DRAINING THE STUFF ***
//* COORDINTERVAL - ALLOW 5 MS MAX FOR COORDINATION ***
//* -------------------------------------------------------------- ***
//START EXEC PGM=IKJEFT01
//SYSPRINT DD SYSOUT=*
//SYSTSPRT DD SYSOUT=*
//SYSTSIN DD DDNAME=SYSIN
RSESSION SNBR(01) VOLSER(XX2C00) +
ACTION (START) +
LSSTYPE (CKD) LSSNBR(0C) +
ESSSERIAL (27131) +
MSSERIAL (27131) +
CGINTERVAL (00) +
CGDRAIN (600) +
COORDINTERVAL(05)
/*
This last step concludes the step-by-step procedure, using TSO commands, for the setup of a
Global Mirror environment with three Global Copy primary volumes spread over two LSSs.
26.4 Primary site failure and recovery management with TSO
This example goes through the required steps to recover from a primary site failure using
TSO commands. This example starts from the configuration that was set up in 26.3, “Set up
the Global Mirror environment using TSO” on page 345. The very same volumes and LSSs
are used in all corresponding TSO command examples. Figure 26-2 on page 353 shows the
configuration during normal operations.