Computer Drive User Manual

Chapter 6. FlashCopy overview 51
The Global Copy secondary will not be in a fully consistent state until the FlashCopy
background copy process is complete and the Global Copy is forced to the full duplex
state. Issue the TSO CESTPAIR command with OPTION(SYNC) to force the Global
Copy to enter the full duplex state.
Use the
copy option to ensure that the entire FlashCopy source volume data is copied
to the Global Copy secondary.
On the Global Copy secondary site a FlashCopy
source volume can be based on the
secondary Global Copy volume.
6.4.3 FlashCopy and Global Mirror
FlashCopy in combination with Global Mirror supports only one type of relationship at the
primary site; see Figure 6-9.
A FlashCopy source volume can become a Global Mirror primary volume and vice versa. The
relationships can be established in any sequence. A FlashCopy target volume cannot
become a Global Mirror primary volume.
Figure 6-9 FlashCopy and Global Mirror
On the Global Mirror secondary site, the Global Mirror target volume cannot be used as
FlashCopy source or FlashCopy target unless the Global Mirror pair is first suspended.
6.5 FlashCopy for z/OS data sets
The following applies when using FlashCopy for z/OS data sets (see Figure 6-10 on page 52):
򐂰 All types of z/OS data sets are supported (sequential, partitioned, and VSAM data sets).
򐂰 The source data set and the target data set can reside on the same or on different
volumes.
򐂰 Within the volumes to which they belong, the source data set and the target data set can
have different relative locations.
source
target
FlashCopy
Global
Mirror
primary
secondary