Start/notes.ini Parameters/Cluster_Probe_Min_Hours

Cluster_Probe_Min_Hours

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Parameter: Cluster_Probe_Min_Hours
Short description: Minimum interval (in hours) between two cluster probes – limits how often the probe task tests the reachability of cluster mates.

Profile

Parameter
Cluster_Probe_Min_Hours
Category
Cluster
Component
Server
Available since
9.0
Supported versions
9.0.1, 10.0, 11.0, 12.0, 14.0, 14.5, 14.5.1
GUI equivalent
notes.ini only (no GUI)
Possible values
Hours as integer

Description

The Cluster Manager regularly probes the reachability of the other cluster members and uses the results to update the failover and workload-balancing tables. On well-functioning clusters, where the status hardly changes, frequent probes create unnecessary load. Cluster_Probe_Min_Hours sets a minimum waiting time between two probe runs – regardless of how often the manager would normally do it.
By default, the value is small (typ. 1 hour) or not set at all; in large clusters it can be set higher to reduce probe traffic over long distances (replication over WAN).

Example configuration

Cluster_Probe_Min_Hours=1

Notes & pitfalls

  • Value in hours.
  • Values that are too high delay failover detection in case of actual outages.
  • Set the same value on all cluster mates.
  • Takes effect after a server restart or restart task cladmin.
  • Complementary to Cluster_Probe_Timeout, Server_Cluster_Default_Port.