Flashcopy And Global Copy - IBM System storage DS6000 Series Redbook

– If you create the FlashCopy first and then do a Metro Mirror of the FlashCopy target,
you must monitor the progress of the FlashCopy background copy. In this case the
following considerations apply:
• The Metro Mirror secondary will not be in a fully consistent state until the FlashCopy
• Use the
On the secondary site of the Metro Mirror, a FlashCopy
secondary volume
Mirror
should be defined first.

6.4.2 FlashCopy and Global Copy

primary
Global
Copy
Figure 6-8 FlashCopy and Global Copy
As illustrated in Figure 6-8, at the primary Global Copy site the following combinations are
possible:
A FlashCopy
The order of creation is optional.
A FlashCopy
you wish to use a FlashCopy target volume as a Global Copy primary, be aware of the
following considerations:
– The recommended order is to first establish the Global Copy, and then create a
FlashCopy to that Global Copy primary using the -tgtpprc parameter if using DS CLI,
or TGTPPRIM(YES) if using TSO, or PPRCPRIM(YES) if using ICKDSF, or
FCTOPPRCPrimary if using DFSMSdss.
The Global Copy secondary will not be in a fully consistent state until the Global Copy
is forced to the full duplex state.
– If you create the FlashCopy first, and then do a Global Copy of the FlashCopy target,
you must monitor the progress of the FlashCopy background copy.
50
IBM System Storage DS6000 Series: Copy Services with IBM System z
background copy process is complete.
copy
option to ensure that the entire FlashCopy source volume data is
copied to the Metro Mirror secondary.
and vice versa. There are no restrictions on which relationship
FlashCopy
source target
primary
source volume
can become a Global Copy
target volume
can become a Global Copy
source volume
Global
Copy
secondary
target
source
FlashCopy
primary volume
primary volume
can be the Metro
and vice versa.
and vice versa. If