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Table 3. Failover and failback implementation (continued)
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Step
Operation
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Disaster at Site
Failover
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A
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2 (Site A volumes must be in suspended state)
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Return
Failback
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production to
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Site A
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3a (Site B volumes should be in a suspended state)
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Return to
Failback
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production (Site
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B)
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Note: If Site A
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is still not
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operational;
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production can
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continue at Site
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B.
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3b (prepare to
Failover
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return to
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production (Site
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A) from
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production (Site
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B)
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3c (Site A volumes should be in a suspended state)
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Return to
Failback
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production -
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Site A
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Returning production to local site after planned outages
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Format of
Manage-
source
ment
volume and
required
target
to
volume
Site B
Volume B,
Volume A
Site A
Volume A,
Volume B
Site B
Volume B,
Volume A
Site A
Volume A,
Volume B
Site A
Volume A,
Volume B
After restoring operations at Site B, you can schedule a failback operation to
synchronize data and to enable production to resume at your original site, Site A.
Before you run a failback operation, you must create paths from Site B to Site A
between the specific LSSs.
For this scenario, assume that Site A is operational and that connectivity from Site
B to Site A is available. Use this procedure to restart your production environment
Format of
source and
target volume
pair
Result: Site 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 A1 :
Volume A1 ->
Volume B1
Volume B1
Volume B1 :
Volume B1 ->
Volume A1
Volume A1
Volume A1:
Volume A1 ->
Volume B1
Volume B1
Volume A1:
Volume A1 ->
Volume B1
Volume B1
Chapter 10. Disaster recovery using Copy Services
Result: Site B
Volume B1 ->
Volume A1
(Suspended)
Volume A1 ->
Volume B1
Volume B1 ->
Volume A1
Volume B1 ->
Volume A1
(Suspended
state; the volume
pair might display
full or pending
state if host write
operations have
stopped.)
Volume A1 ->
Volume B1
143
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