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Dell EMC Avamar for Windows Servers 19.7 User Guide

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NTFS Last Access Time

To correctly back up Windows access control list (ACL) changes, you must leave the NTFS Last Access Time feature enabled. The NTFS Last Access Time feature is enabled by default, but is sometimes disabled for performance purposes.

About this task

If you disable the NTFS Last Access Time feature on a Windows backup client and you have already performed backups, then the Avamar Client for Windows software cannot detect any further ACL changes. This action means that the ACL setting for the file during the original file backup is the ACL setting that applies on all future restores.

Complete the following steps to reestablish proper ACL backup behavior.

Steps

  1. Enable the NTFS Last Access Time feature by using one of the following methods:
    • Specify a value of 0 in the following registry entry:

      HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\FileSystem\NtfsDisableLastAccessUpdate.

      A value of 0 enables Last Access Time, while a value of 1 disables Last Access Time.

    • On Windows 7, Windows Storage Server 2008, Windows Server 2008 R2, Windows Storage Server 2008 R2, Windows Server 2008, and Vista platforms, type the following command from a command prompt:

      fsutil behavior set disablelastaccess 0

  2. Delete the following local Avamar Client for Windows cache files:
    • C:\Program Files\avs\var\f_cache.dat
    • C:\Program Files\avs\var\p_cache.dat

    The next backup process for the client re-creates the files.

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