Start/notes.ini Parameters/SERVER_AVAILABILITY_THRESHOLD

SERVER_AVAILABILITY_THRESHOLD

🛠️
Parameter: SERVER_AVAILABILITY_THRESHOLD
Short description: Threshold for the availability index – below this value the server no longer accepts new client sessions (cluster failover).

Profile

Parameter
SERVER_AVAILABILITY_THRESHOLD
Category
Performance / Memory
Component
Server
Available since
10.0
Supported versions
10.0, 11.0, 12.0, 14.0, 14.5, 14.5.1
GUI equivalent
Server document (Server Tasks → Cluster)
Possible values
0–100 (0 = always available, 100 = never; typically 20–70)

Description

⚠️
Verify spelling. The availability-threshold concept is HCL-real and documented in the Server document under Server Properties → Cluster → 'Server Availability Threshold' (othr_serverpropertiescluster_c). A notes.ini switch with the exact name SERVER_AVAILABILITY_THRESHOLD and the value range 0–100 is not directly documented in HCL KBs — the field is primarily configured via the Server document. Verify before production use.
Domino continuously calculates an availability index (0–100) from response times and load. If the value falls below the threshold, the cluster manager directs new sessions to other cluster members – an elegant form of dynamic load balancing.
A value of 0 disables failover (the server always accepts), 100 effectively locks the server out permanently.

Example configuration

SERVER_AVAILABILITY_THRESHOLD=30

Notes & pitfalls

  • Only effective in cluster setups (Cluster_Probe_Min_Hours & co.).
  • The current index is shown by show server as Availability Index.
  • For clean maintenance windows, prefer set config SERVER_RESTRICTED=2 instead of briefly manipulating this value.
  • Very low values can delay failover – watch monitoring.
  • Takes effect immediately after set config; no restart needed.