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Chapter 22. Global Mirror overview 259
22.3.6 Populate Global Mirror session with volumes
Figure 22-14 Add Global Copy primary volume to Global Mirror session
The next step is the definition of volumes in the Global Mirror session. The focus is still on the
local site; see Figure 22-14. Note that only Global Copy primary volumes are meaningful
candidates to become a member of a Global Mirror session.
This process adds primary volumes to a list of volumes in the Global Mirror session. But at
this stage it does still not perform consistency group formation.
Note that Global Copy is replicating, on the Global Copy secondary volumes, the application
updates that arrive to the Global Copy primary volumes. Initially the Global Copy primary
volumes are placed in a
join pending status. Once a Consistency Group is formed, the Global
Copy primary volume will then be added to the session and will be placed in an
in session
status.
Nothing happens to the C volume after its initial establishment in a Global Mirror session.
22.3.7 Start Global Mirror session
This is the last step and it starts the Global Mirror session. Upon this, Global Mirror starts to
form Consistency Groups at the remote site. As Figure 22-15 on page 260 indicates, the
focus here is on the local site, with the start command issued to an LSS in the primary
storage disk subsystem. With this start command you set the Master storage disk subsystem
and the Master LSS. From now on, session related commands have to go through this Master
LSS.
Global Copy
Primary
Primary
A
A
Primary
Primary
Primary
Primary
A
B
O
O
S
Host
Remote site
Local site
Primary
Secondary
PENDING
PENDING
FlashCopy
C
MODE(ASYNC)
Tertiary
T
B
M
S
B
M
Add Global Copy primary volume to Global Mirror session
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