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50 IBM System Storage DS6000 Series: Copy Services with IBM System z
– 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
background copy process is complete.
•Use the
copy option to ensure that the entire FlashCopy source volume data is
copied to the Metro Mirror secondary.
On the secondary site of the Metro Mirror, a FlashCopy
source volume can be the Metro
Mirror
secondary volume and vice versa. There are no restrictions on which relationship
should be defined first.
6.4.2 FlashCopy and 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
source volume can become a Global Copy primary volume and vice versa.
The order of creation is optional.
A FlashCopy
target volume can become a Global Copy primary volume and vice versa. If
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.
source
target
FlashCopy
Global
Copy
primary
secondaryprimary
Global
Copy
source
target
FlashCopy