IBM TotalStorage DS8000 User Manual

Table 4. Failover and failback implementation (continued)
Step Operation
Manage-
ment
required
to
Format of
source volume
and target
volume
Format of
source and
target volume
pair Result: Site A Result: Site B
Disaster at Site
A
Failover Site B Volume B,
Volume A
Volume B1 :
Volume A1
Volume A1 ->
Volume B1
(Suspended)
The volume pair
might display as
full or pending
duplex state if
host write
operations have
stopped.
Volume B1 ->
Volume A1
(Suspended)
2 (Site A volumes must be in suspended state)
Return
production to
Site A
Failback Site A Volume A,
Volume B
Volume A1 :
Volume B1
Volume A1 ->
Volume B1
Volume A1 ->
Volume B1
3a (Site B volumes should be in a suspended state)
Return to
production
(Site B)
Note: If Site A
is still not
opera- tional;
production can
continue at
Site B.
Failback Site B Volume B,
Volume A
Volume B1 :
Volume A1
Volume B1 ->
Volume A1
Volume B1 ->
Volume A1
3b (prepare to
return to
production
(Site A) from
production
(Site B)
Failover Site A Volume A,
Volume B
Volume A1:
Volume B1
Volume A1 ->
Volume B1
Volume B1 ->
Volume A1
(Suspended
state; the volume
pair might display
full or pending
state if host write
operations have
stopped.)
3c (Site A volumes should be in a suspended state)
Return to
production -
Site A
Failback Site A Volume A,
Volume B
Volume A1:
Volume B1
Volume A1 ->
Volume B1
Volume A1 ->
Volume B1
Using Global Mirror for disaster recovery
Global Mirror is a long-distance, two-site, remote copy solution that uses
asynchronous technology. Global Mirror is based on existing Global Copy and
FlashCopy functions.
The following tasks are illustrated:
v Setting up your environment to use Global Mirror
v Using Global Mirror for a planned failover
v Using Global Mirror for an unplanned failover
v Using recovery procedures with and without the fast reverse feature
146 DS8000 User’s Guide
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IBM TotalStorage DS8000 Specifications

General

Brand	IBM
Model	TotalStorage DS8000
Category	Storage
Language	English