Notes.ini Entry


Name:
    Debug_FileSizeThreshold

Syntax
    Debug_FileSizeThreshold=MB

Applies to:
    Servers

Add-on:

    First Release:
      6.5.4 FP2

    Obsolete since:

      Category:
        Debug

      Default:
        None

      UI equivalent:
        None

      Description:
      A new NOTES.INI parameter has been introduced to regulate file system cache behavior: DEBUG_FileSizeThreshold=[file size in MB].

      This parameter mandates that any database larger than the specified size will be opened without using the file system cache.

      Note that this can be enabled dynamically on the Domino console, with no need to restart. While this circumvents the compact task performance issue, be aware that this parameter causes all databases above the limit to bypass the cache for all database operations. Depending on the server configuration and databases used, this may cause an impact on database read performance.

      Once enabled, these parameters can have a marked impact on compact performance. The following chart illustrates tests performed on sample databases with compact. Note that these times are for comparison purposes only. The contents of the database and the hardware capabilities of the Domino system performing the compact can cause variations in performance.

      Operating System
      WIN32
      SOLARIS
      AIX
      compact time 20MB
      00:01:36
      00:01:15
      00:00:28
      NEW compact time 20MB
      00:01:51
      00:00:26
      00:00:15
      compact time 500MB
      00:33:39
      01:02:04
      01:43:10
      NEW compact time 500MB
      00:27:56
      00:20:34
      01:21:51
      compact time 1GB
      01:25:04
      03:38:02
      10:00:54
      NEW compact time 1GB
      00:48:33
      00:50:07
      NA


      These new options are designed to optimize performance by bypassing the standard caching mechanisms the server uses. There are also operating system optimizations that can improve performance by improving buffer management. To date, the main operating system to incorporate these optimizations is AIX; version 5.3 has changes to the Logical Volume Manager that increases performance and throughput on operations such as compact. The following sample statistics show the benefits of compact performance under AIX 5.3.

      Operating System
      AIX 5.2
      AIX 5.3
      compact time 7.1 GB
      05:47:00
      3:41:00


      Refer to the Upgrade Central site for details on upgrading Notes/Domino.