Create A Data Consistent Set Of B Volumes; Optionally Create A Data Consistent Set Of D Volumes - IBM System storage DS6000 Series Redbook

26.4.5 Create a data consistent set of B volumes

The next step is to create a set of consistent volumes. This requires a specific FlashCopy
operation, which is
2C00
Primary
Primary
Primary
Primary
Local site
Figure 26-4 Establish FlashCopy from last consistent C to B
This FlashCopy command uses the C volume as the source volume and the B volume as the
target volume.
Example 26-19 shows the ACTION(FRR) command parameter. In the example we use
source and target z/OS device numbers, which implies that there is host connectivity to the
secondary storage disk subsystem.
Example 26-19 Create a set of consistent B volumes
//* -------------------------------------------------------------- ***
//FCFRR
//SYSPRINT DD SYSOUT=*
//SYSTSPRT DD SYSOUT=*
//SYSTSIN
FCESTABL SDEVN(X'3E00') TDEVN(X'3C00') ACTION(FRR)
FCESTABL SDEVN(X'3F00') TDEVN(X'3D00') ACTION(FRR)
FCESTABL SDEVN(X'3F01') TDEVN(X'3D01') ACTION(FRR)
The FCESTABL command with the ACTION(FRR) parameter value does a background copy
operation that copies only the changed tracks from the C to the B volumes, those which
changed since the last Consistency Group formation. Once the background copy completes,
the FlashCopy relationship between the C and B volumes is withdrawn and ends. After that,
the C volumes are not usable and only the B volumes are now a set of data consistent
volumes.

26.4.6 Optionally create a data consistent set of D volumes

Optionally, you can create a second copy of valid data by doing a copy of the B volumes on a
set of D volumes. Example 26-20 on page 357 shows how to do this.
356
IBM System Storage DS6000 Series: Copy Services with IBM System z
fast reverse restore
Host
2D01
A
2D00
A
Primary
Primary
A
EXEC PGM=IKJEFT01
DD DDNAME=SYSIN
, FRR; see Figure 26-4.
FICON
Global Copy
FlashCopy
FRR
3D01
A
3D00
A
3C00
Primary
3F01
Primary
Primary
B
A
Primary
3F00
A
Secondary 3E00
Primary
Primary
Primary C
Primary
Tertiary
Remote site