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  1. Home
  2. NetBackup™ Backup Planning and Performance Tuning Guide
  3. Tuning the NetBackup data transfer path
  4. NetBackup server performance in the data transfer path
  5. About shared memory (number and size of data buffers)
  6. How to change the number of shared data buffers
NetBackup™ Backup Planning and Performance Tuning Guide

How to change the number of shared data buffers

You can change the number of shared data buffers by creating the following file(s) on the media server. In the files, enter an integer number of shared data buffers.

  • Linux/UNIX

    For tape:

    /usr/openv/netbackup/db/config/NUMBER_DATA_BUFFERS
    /usr/openv/netbackup/db/config/NUMBER_DATA_BUFFERS_RESTORE

    The value specified by NUMBER_DATA_BUFFERS determines the number of shared memory buffers for all types of backups and restores if none of the following NUMBER_DATA_BUFFERS_xxxx files exists.

    For disk:

    /usr/openv/netbackup/db/config/NUMBER_DATA_BUFFERS_DISK

    For multiple copies (Inline Copy):

    /usr/openv/netbackup/db/config/NUMBER_DATA_BUFFERS_MULTCOPY

    For the FT media server:

    /usr/openv/netbackup/db/config/NUMBER_DATA_BUFFERS_FT
    /usr/openv/netbackup/db/config/NUMBER_DATA_BUFFERS_RESTORE_FT

    Note:

    To change the FT media server buffer sizes, contact Veritas support first.

  • Windows

    For tape:

    install_path\NetBackup\db\config\NUMBER_DATA_BUFFERS
    install_path\NetBackup\db\config\NUMBER_DATA_BUFFERS_RESTORE

    The value specified by NUMBER_DATA_BUFFERS determines the number of shared memory buffers for all types of backups and restores if none of the following NUMBER_DATA_BUFFERS_xxxx files exists.

    For disk:

    install_path\NetBackup\db\config\NUMBER_DATA_BUFFERS_DISK

    For multiple copies (Inline Copy):

    install_path\NetBackup\db\config\NUMBER_DATA_BUFFERS_MULTCOPY

    For the FT media server:

    Note: The FT media server is not yet supported on Windows.

More Information

Notes on number data buffers files

Testing changes made to shared memory

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