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Chapter 24. Global Mirror interfaces 299
Figure 24-1 Establish FlashCopy relationship within Global Mirror
24.2.1 Establish FlashCopy using TSO
Example 24-1 shows the TSO command that creates the FlashCopy relationship between the
B and the C volumes.
Example 24-1 Establish FlashCopy between B and C volumes using a TSO command
FCESTABL SDEVN(X'3C00') TDEVN(X'3E00') MODE(ASYNC)
In the FCESTABL command, the source and target volumes are identified by their z/OS device
number. This does not require any further information, such as serial numbers or WWNNs,
nor does it need to identify an SMC to address the function. The MODE(ASYNC) parameter
implicitly combines all necessary attributes for this FlashCopy relationship: START CHANGE
RECORDING, INHIBIT TARGET WRITE, and NOCOPY.
Example 24-2 shows the inband version of this FlashCopy command when the FlashCopy is
triggered from the local site. Here the FlashCopy command is issued to the Global Copy
primary volume at the local site, and then propagated inband over the paths to the remote
site. Note that this example assumes that the Global Copy paths and pairs have already been
established.
Example 24-2 inband TSO command to create a FlashCopy between B and C
FCESTABL DEVN(X'2C00') SOURCE(73081 00 0C) +
TARGET(73081 00 0E) +
REMOTE(YES) SSID(3C00) MODE(ASYNC)
There is no change for the FlashCopy attributes. The only addition is the addressing of the
Global Copy primary volume with the z/OS device address in the DEVN parameter, and the
identification of the FlashCopy source and target volumes at the remote site, with the
corresponding SOURCE and TARGET parameters. You use inband commands when there is
no host channel connection from the local server to the remote storage disk subsystem.
Example 24-2 assumes that there is a Fibre Channel connection from the local to the remote
storage disk subsystem. It also assumes that the remote devices are defined and configured
in the system from where you issue the command.
Global Copy
Primary
Primary
Primary
A
A
Primary
Primary
Primary
Primary
Primary
A
B
O
O
S
Host
Remote
site
Local
site
Primary
Secondary
PENDING
PENDING
Write I/O
FlashCopy
C
MODE(ASYNC)
Tertiary
T
B
M
S
B
M
TBM: Target Bit Map
SBM: Source Bit Map