IBM System storage DS6000 Series Redbook page 304

Host channels
FICON
Host
Figure 23-7 Host connectivity at both sites
In case of a failure at the local site the host at the remote site may recover from the Global
Mirror configuration as discussed in 23.7, "Recovery scenario after primary site failure" on
page 282. Note that the host at the remote site requires a disk environment that is
independent from the Global Mirror environment.
All Global Mirror-related management commands may be executed at the respective site.
The local host may execute all commands that address the primary volumes. The remote
host may execute all the commands targeted to the secondary or tertiary volumes. From a
management viewpoint this may not be the preferable approach to managing a Global Mirror
environment.
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IBM System Storage DS6000 Series: Copy Services with IBM System z
01
A
Primary A
Primary
Primary
PENDING
01
A
Primary A
Primary
Primary
PENDING
01
A
Global Mirror
Primary A
Primary
session links
Primary
PENDING
FCP
Global Copy links
Local site
Primary
B
Primary
Secondary
PENDING
Primary B
Primary
Secondary
PENDING
Primary B
Primary
Global Mirror
Secondary
session links
ISL
PENDING
FCP
A
Primary
Primary
C
Tertiary
A
Primary
Primary
C
Tertiary
A
Primary Host channels
Primary
C
Tertiary
FICON
Remote site
Host