Building Disaster Recovery Serviceguard Solutions Using Metrocluster with Continuous Access XP P9000 for Linux B.12.00.00

Table 6 Failover/failback scenarios (continued)
AUTO parameters or FORCEFLAG setMetrocluster Behavior (By default)Fence LevelFailover/Failback Scenarios
FORCEFLAG is present, Metrocluster
package starts and issues
horctakeover -S which results in SVOL
takeover.
Mode449 set to OFF:Mode449 set to OFF:async
(journal)
Metrocluster package checks for
AUTO_NONCURDATA setting and
Metrocluster package fails to start
as AUTO_NONCURDATA is set to
“0” and FORCEFLAG is not present. FORCEFLAG presence. If
AUTO_NONCURDATA is set to “1”
or FORCEFLAG is present,
Metrocluster package starts and
issues horctakeover -S which results
in SVOL takeover.
Mode449 set to ON:Mode449 set to ON:
Metrocluster package checks for
AUTO_SVOLPSUE setting and
Metrocluster package fails to start
as AUTO_SVOLPSUE is set to “0”
and FORCEFLAG is not present.
FORCEFLAG presence. If
AUTO_SVOLPSUE is set to “1” or
FORCEFLAG is present, Metrocluster
package starts and issues
horctakeover -S which results in SVOL
takeover.
If AUTO_PSUEPSUS is set to “1” or
FORCEFLAG is present,
Metrocluster package fails to start
as AUTO_PSUEPSUS is set to “0”
and FORCEFLAG is not present.
AnyFailback to primary site
after link restoration and
recovery of primary site
nodes.
• Metrocluster package
Resynchronizes data from the
recovery site to primary site by
issuing pairesync swapp
command.
• Issues horctakeover on the
primary site to replicate data to
the recovery site.
Metrocluster package checks for
AUTO_SVOLPSUS setting and
Metrocluster package fails to start
as AUTO_SVOLPSUS is set to “0”
and FORCEFLAG is not present
AnyManual suspend followed
by application failure on all
nodes in the primary site FORCEFLAG presence. If
AUTO_SVOLPSUE is set to “1” or
FORCEFLAG is present, Metrocluster
package starts and issues
horctakeover -S which results in SVOL
takeover.
If AUTO_PSUSSSWS is set to “1” or
FORCEFLAG is present,
Metrocluster package fails to start
as AUTO_PSUSSSWS is set to “0”
and FORCEFLAG is not present.
AnyFailback to the primary site
• Metrocluster package
Resynchronizes data from the
recovery site to primary site by
issuing pairesync swapp
command.
• Issues horctakeover on the
primary site to replicate data to
the recovery site.
Metrocluster package checks for
AUTO_SVOLPSUS setting and
Metrocluster package fails to start
as AUTO_SVOLPSUS is set to “0”
and FORCEFLAG is not present.
AnyManual suspend followed
by failure of all nodes in
the primary site. FORCEFLAG presence. If
AUTO_SVOLPSUE is set to “1” or
FORCEFLAG is present, Metrocluster
38 Understanding failover/failback scenarios