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280 IBM System Storage DS6000 Series: Copy Services with IBM System z
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.
Remote siteLocal site
Primary
Primary
A
B
Secondary
Primary
Primary
C
Tertiary
PENDING
Primary
Primary
A
B
Secondary
Primary
Primary
C
Tertiary
PENDING
Primary
Primary
A
B
Secondary
Primary
Primary
C
Tertiary
PENDING
Primary
Primary
A
A
Primary
PENDING
01
Primary
Primary
A
A
Primary
PENDING
01
Primary
Primary
A
A
Primary
PENDING
01
ISL
Host channels
Host channels
Global Mirror
session links
Host
Global Copy links
FCPFICON FCP FICON
Global Mirror
session links
Host