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Partition Management
3.6 Managing Partitions
3.6.4.2 Programming Information
To set the partition backend priority list, program the
set_qualifier
argument
of the
rtr_set_info( )
call as follows:
rtr_qualifier_value_t set_qualifiers[ 2 ];
char *szNodeList = "your,list,of,node,names,here"
set_qualifiers[ 0 ].qv_qualifier = rtr_partition_be_priority_list;
set_qualifiers[ 0 ].qv_value = &szNodeList;
set_qualifiers[ 1 ].qv_qualifier = rtr_qualifiers_end;
set_qualifiers[ 1 ].qv_value = NULL;
3.6.5 Controlling Failover
In a system configured for maximum fault tolerance employing both shadows and
standbys, there is a choice to be made in case of the failure of the primary site.
The qualifier to the
SET PARTITION
command of
/FAILOVER_POLICY=
allows the
system operator to select one of the following policies that RTR should pursue in
selecting the new primary site in the event of a failure:
•
/FAILOVER_POLICY=STANDBY
causes RTR to choose a standby of the failed
primary (if any) to become the new primary. If there is more than one
standby, the operator may addition use the priority list feature (described
above) to control which standby is preferred. Depending on the size of the
journal of the failed primary, there will be a hold up in the processing of
transactions whilst the journal is recovered. This is the default behaviour.
•
/FAILOVER_POLICY=SHADOW
instructs RTR to make the active secondary (if
any) the new primary. A standby of the failed primary (if any) will be elected
to become the new secondary. This option gives the shortest fail over time,
but will move the primary to a different cluster that you may have located at
a different site.
•
/FAILOVER_POLICY=COMPATIBLE_PRE_V32
is a mode that will operate with
configurations that contain RTR routers running versions of the software
prior to V3.2. This mode will be automatically adopted if such routers exists
in or join the configuration.
3.6.5.1 Command Line Example
An example use of the
/FAILOVER_POLICY
qualifier:
RTR> SET PARTITION/FAILOVER_POLICY=SHADOW Facility1:Partition1
For more information see the SET PARTITION command in Chapter 6.
3.6.5.2 Programming Information
To set the partition failover policy, program the
set_qualifier
argument of the
rtr_set_info( )
call as follows:
rtr_qualifier_value_t set_qualifiers[ 2 ];
rtr_partition_failover_policy_t newPolicy;
set_qualifiers[ 0 ].qv_qualifier = rtr_partition_failover_policy;
set_qualifiers[ 0 ].qv_value = &newPolicy;
set_qualifiers[ 1 ].qv_qualifier = rtr_qualifiers_end;
set_qualifiers[ 1 ].qv_value = NULL;
Legal values for
newPolicy
are:
•
rtr_partition_fail_to_standby
3–8 Partition Management