Start/notes.ini Parameters/PercentAvailSysResources

PercentAvailSysResources

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Parameter: PercentAvailSysResources
Summary: Limits the share of physical memory the Domino server process is allowed to use – the central memory tuning lever.

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
Integer 1–100 (typically 50–100)

Description

PercentAvailSysResources defines what percentage of physical memory Domino may request for its internal pools (NSF buffer pool, NIF pool, address pools, server working set). On dedicated Domino servers, keep the value high (80–100) so caches are filled generously. On consolidated hosts running additional services (database, anti-virus, backup agent), a value between 50 and 75 prevents Domino from starving the operating system of memory.

Example configuration

PercentAvailSysResources=80

Notes & pitfalls

  • A central parameter on 64-bit Domino – also affects the size of NSF_Buffer_Pool_Size_MB (unless that value is hard-coded).
  • Values too low → smaller caches, more I/O, worse response times.
  • Values too high on shared hosts → OS swapping, performance drops.
  • Takes effect after a server restart.
  • Plan in tandem with Memory_Quota, NSF_Buffer_Pool_Size_MB, and Server_MaxConcurrentTrans.