Start/notes.ini Parameters/NOTES_SHARED_DPOOLSIZE

NOTES_SHARED_DPOOLSIZE

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Parameter: NOTES_SHARED_DPOOLSIZE
Short description: Size of each individual shared-memory pool (DPool) from which Notes / Domino allocates memory – fine tuning for very large servers.

Profile

Parameter
NOTES_SHARED_DPOOLSIZE
Category
Performance / Memory
Component
Server
Available since
R6
Supported versions
9.0.1, 10.0, 11.0, 12.0, 14.0, 14.5
GUI equivalent
notes.ini only (no GUI)
Possible values
Bytes, default 8,388,608 (8 MB); on 64-bit typically 16–32 MB

Description

Notes / Domino manages shared memory in so-called DPools (Dynamic Pools). NOTES_SHARED_DPOOLSIZE sets the size of a single DPool segment. On very large servers (many user sessions, large mail files, many indexer threads), the default of 8 MB can lead to many small fragments – raising the value to 16 or 32 MB then makes sense.
Important: the value is an optimization, not a limit. Domino allocates additional DPools as needed; larger pools merely reduce the number of management structures.

Example configuration

NOTES_SHARED_DPOOLSIZE=33554432

Notes & pitfalls

  • Value in bytes.
  • Typically change only on a recommendation from HCL support.
  • The impact becomes visible in NSDs / show stat memory.
  • With a too-high value: unused, reserved RAM increases.
  • The change only takes effect after a server restart.