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About qtrees and managing qtrees PDF Print E-mail
Written by Siva   
Saturday, 30 October 2010 14:08

 

About qtrees

 

A qtree is a logically defined file system that can exist as a special subdirectory of the root directory within either a traditional volume or a flexible volume. You can create up to 4995 qtrees per volume.

 

You might create a qtree for one or more of the following reasons:

 

  • You can easily create qtrees for managing and partitioning your data within the volume.

 

  • You can create a qtree to assign user- or workgroup-based soft or hard usage quotas to limit the amount of storage space that a specified user or group of users can use on the qtree to which they have access.
     

In general, qtrees are similar to volumes. However, they have the following key differences:

  • Snapshots can be enabled or disabled for individual volumes but not for individual qtrees.
     
  • Qtrees do not support space reservations or space guarantees.
     

You can use qtrees regardless of whether quotas are enabled on your storage system. There are no restrictions on how much disk space can be used by the qtree or how many files can exist in the qtree.

For more information about qtrees, see the Data ONTAP Storage Management Guide.

 

 

Manage Qtrees

 

In the Manage QTrees page, you can perform the following procedures:

 

Adding qtrees:

To create a qtree on an existing volume of the storage system, complete the following steps:

  1. In the top left corner of the Manage Qtrees page, click Add Qtree.

    Result: The Add Qtree page is displayed.
  2. In the Volume field, use the drop-down list to select the name of the volume on which you want to create the qtree.
  3. In the Qtree Name field, enter the name of the qtree you are creating.
  4. In the Security Style field, use the drop-down list to select the security style you want to use for this qtree. 
  5. In the Oplocks field, select the Oplocks check box to enable oplocks.
  6. Click Add to create the qtree.

 

Modifying qtrees:

To modify an existing qtree, complete the following steps:

  1. From the Manage Qtrees page, click the qtree you want to modify.

    Result: The Modify Qtrees page is displayed. The Volume and Qtree Name fields are for display only and cannot be changed.
  2. In the Security Style field, select the type of security you want to have for this qtree.
  3. In the Oplocks field, select the check box if you want to enable oplocks for this qtree.
  4. Click Apply to save the configuration changes.

 

Deleting qtrees:

Note: You can delete a qtree only if it is empty.

To delete a qtree, complete the following steps.

  1. From the Manage Qtrees page, select the checkbox for each qtree you want to delete.
  2. Click Delete.

The qtree is deleted and the Manage Qtrees page is refreshed to show the updated roster of qtrees.

 
 

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