Start/notes.ini Parameters/PercentAvailSysResources

PercentAvailSysResources

Parameter: PercentAvailSysResources
Short description: Percentage share of system resources that the Domino server is allowed to claim for itself during automatic memory sizing.

Profile

Parameter
PercentAvailSysResources
Category
Performance / Memory
Component
Server
Available since
9.0.1
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
1 – 100 (percent); default approx. 25 – 50 depending on platform

Description

PercentAvailSysResources is a hint to the Domino server as to what percentage of the available physical system resources it is allowed to claim during automatic sizing of its caches and pools. If no value is set, the server uses platform-dependent defaults.
The parameter is particularly relevant when other services (e.g. backup agent, antivirus, other database servers) run alongside Domino on the same host and Domino should not reserve all the memory for itself. Lower values lead to smaller automatically calculated buffer pools, higher values to more aggressive memory usage.
For most productive single-Domino servers it is common today to set NSF_Buffer_Pool_Size_MB and related memory parameters directly instead of this parameter, in order to achieve deterministic sizing.

Example configuration

PercentAvailSysResources=50

Notes & pitfalls

  • Takes effect only after a server restart.
  • Has no effect if the affected pools (e.g. NSF buffer pool) are explicitly sized via other notes.ini parameters — those take precedence.
  • On 64-bit servers with large RAM, a value that is too high can cause Domino to reserve excessive memory and crowd out other processes.
  • Validate current usage via show memory and show stat Mem.*.
  • For dedicated Domino hosts, explicit sizing of individual pools is preferable to a percentage value.

Sources (HCL Product Documentation)