Tools > File Systems > Truncation Parameters

This page enables you to view or change the following information pertinent to the truncation feature as it pertains to StorNext Storage Manager:

Note: This page pertains ONLY to truncation for StorNext Storage Manager users. It does not apply to deduplication or other StorNext features.

Parameter Description

Run

Indicates the current status of the truncation feature (Active or Disabled).

Mount

Indicates whether the file system is currently mounted.

File System

Displays the name of the truncation-enabled file system.

Mount Point

Shows the mount point for the truncation-enabled file system

Truncation Parameters

Shows the current truncation setting, such as Time-based 75%.
  1. On the Tools menu, click File Systems, and then click Truncation Parameters.

  2. Click the line containing the file system whose truncation parameters you want to change. Parameters appear at the bottom of the page. As desired, update any of the following fields:

    Parameter Description
    File System Displays the name of the truncation-enabled file system.

    Low Water (%)

    Enter the percentage of occupied disk space a file system must reach before StorNext stops applying truncation.

    High Water (%)

    Enter the percentage of occupied disk space a file system must reach before StorNext starts applying truncation.
    Enable Min Use Click to enable or disable the use of the percentage value specified in the Minimum Usage (%) field.

    Minimum Usage (%)

    Enter the usage percentage at which the file system must be before truncation starts taking place on the file system. This parameter is used so that files are not truncated if the file system is not at least this full.

    Enable Space-based Truncation

    Click to enable or disable spaced-based truncation for the selected file system.

    Note: If you disable space-based truncation, then the managed file system might fill up; if there are no manual deletions or truncation (fsrmcopy) operations occurring, then this will likely be the case. Also, note that another side effect of disabling truncation is that tracking of truncation candidates is disabled. If/when the feature is enabled, then there is a time and an expense associated with rebuilding the truncation candidate list. To completely rebuild the list, you must manually rebuild the policy. For example, by executing the following command:

    fspolicy -b -C -y <mount_point>

    Space Based Truncation

    With space based truncation, when the file system hits the high water mark (defined in /usr/adic/TSM/config/filesystems) , Storage manager truncates down to the low water mark based upon the truncation minimum time of the files and using the oldest files first.

    If the file system hits nospace, then Storage Manager truncates the largest files ignoring the minimum time to try and get this down as quickly as possible.

     

    Time Based Truncation

    With time based truncation, there is a policy that runs nightly that truncates down to the min Use setting in the file system's file. This policy truncates the oldest files first of files that meet the truncation minimum time, similar to the space spaced non-emergency policy.

    It does not truncate all of the files, just down to min Use. If you want all of the files truncated, then you can set min Use to zero.

    Note: If it helps, you can examine the comments at the top of the /usr/adic/TSM/config/filesystems file. Also, see the fsaddclass and fsmodclass commands in the StorNext 6 Man Pages Reference Guide.
  3. Click Apply to save your changes.

  4. When a confirmation message appears, click Yes to continue or No to abort without saving.

    Note: When you save changes to truncation parameters, the StorNext Policy Manager must be restarted. This process could take several minutes, so plan accordingly.

  5. Click Done when you are finished viewing or changing truncation parameters.