HP ProLiant 4500 Compaq ProLiant Cluster HA/F100 and HA/F200 Administrator Gui - Page 72

Terms and Definitions, Table 2-4, Group Failover/Failback Policy Terms and Definitions, Microsoft

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Designing the Compaq ProLiant Clusters HA/F100 and HA/F200 2-41 Terms and Definitions The following terms and definitions are used in defining failover/failback policies for cluster groups. Table 2-4 Group Failover/Failback Policy Terms and Definitions Term Failover policy Failback policy Preferred owner Failover threshold Failover period Prevent Allow Allow immediately Allow between hours Definition The circumstances MSCS uses to take a group offline on the primary (preferred) node and online on the secondary node. The circumstances MSCS uses to bring a group offline on the secondary node and online on the primary (preferred) node. The cluster node you want the cluster group to run on when the cluster is in a normal state. The number of times MSCS will attempt to fail over a group within a specified failover period. The length of time in which MSCS attempts to fail over a cluster group. When the failover threshold count has been exceeded within the failover period, MSCS leaves the group on its current node, in its current state. Example: If the failover threshold = 5 and the failover period = 1, MSCS will attempt to fail over the group 5 times within a 1-hour period. Prevent automatic failback. This setting allows the administrator to fail back a group manually. Allow automatic failback. This setting allows MSCS to fail back a group automatically. This setting allows automatic failback as soon as the preferred node is reintegrated into the cluster and brought back online. This setting allows the administrator to determine specific hours of the day during which automatic failback can occur. Refer to the Microsoft Cluster Server Administrator's Guide for detailed information about failover and failback policies of groups and resources.

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Designing the Compaq ProLiant Clusters HA/F100 and HA/F200
2-41
Terms and Definitions
The following terms and definitions are used in defining failover/failback
policies for cluster groups.
Table 2-4
Group Failover/Failback Policy Terms and Definitions
Term
Definition
Failover policy
The circumstances MSCS uses to take a group offline on the
primary (preferred) node and online on the secondary node.
Failback policy
The circumstances MSCS uses to bring a group offline on the
secondary node and online on the primary (preferred) node.
Preferred owner
The cluster node you want the cluster group to run on when the
cluster is in a normal state.
Failover threshold
The number of times MSCS will attempt to fail over a group within
a specified failover period.
Failover period
The length of time in which MSCS attempts to fail over a cluster
group. When the failover threshold count has been exceeded
within the failover period, MSCS leaves the group on its current
node, in its current state.
Example:
If the failover threshold = 5 and the failover period = 1,
MSCS will attempt to fail over the group 5 times within a 1-hour
period.
Prevent
Prevent automatic failback. This setting allows the administrator
to fail back a group manually.
Allow
Allow automatic failback. This setting allows MSCS to fail back a
group automatically.
Allow immediately
This setting allows automatic failback as soon as the preferred
node is reintegrated into the cluster and brought back online.
Allow between hours
This setting allows the administrator to determine specific hours
of the day during which automatic failback can occur.
Refer to the
Microsoft
Cluster Server Administrator’s Guide
for detailed
information about failover and failback policies of groups and resources.