Enabling or disabling last access time updates

When grid administrators create the Information Lifecycle Management (ILM) rules for a StorageGRID system, they can optionally specify that an object's last access time be used to determine whether to move that object to a different storage location. If you are using an S3 tenant, you can take advantage of such rules by enabling last access time updates for the objects in an S3 bucket.

Before you begin

These instructions only apply to StorageGRID systems that include at least one ILM rule that uses the Last Access Time option in its placement instructions. You can ignore these instructions if your StorageGRID system does not include such a rule.

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Users must belong to a user group that has the Manage All Containers or the Root Access permission. These permissions override the permissions settings in group or bucket policies.

About this task

Last Access Time is one of the options available for the Reference Time placement instruction for an ILM rule. Setting the Reference Time for a rule to Last Access Time lets grid administrators specify that objects be placed in certain storage locations based on when those objects were last retrieved (read or viewed).

For example, to ensure that recently viewed objects remain on faster storage, a grid administrator can create an ILM rule specifying the following:

Objects that have been retrieved in the past month should remain on local Storage Nodes.
Objects that have not been retrieved in the past month should be moved to an off-site location.

Note: See the instructions for administering StorageGRID for more information.

By default, updates to last access time are disabled. If your StorageGRID system includes an ILM rule that uses the Last Access Time option, you must enable updates to last access time for the S3 buckets specified in that rule.

The table summarizes the behavior applied to all objects in the bucket when last access time is disabled or enabled.

Type of request	Behavior if last access time is disabled (default)		Behavior if last access time is enabled
Type of request	Last access time updated?	Object added to ILM evaluation queue?	Last access time updated?	Object added to ILM evaluation queue?
Request to retrieve an object, its access control list, or its metadata	No	No	Yes	Yes
Request to update an object’s metadata	Yes	Yes	Yes	Yes
Request to copy an object from one bucket to another	No, for the source copy Yes, for the destination copy	No, for the source copy Yes, for the destination copy	Yes, for the source copy Yes, for the destination copy	Yes, for the source copy Yes, for the destination copy
Request to complete a multipart upload	Yes, for the assembled object	Yes, for the assembled object	Yes, for the assembled object	Yes, for the assembled object

Before enabling last access time for a bucket, be aware that the enabled setting can reduce StorageGRID performance, especially in systems with small objects. The performance impact occurs because StorageGRID must perform these additional steps every time objects are retrieved:

Update the objects with new timestamps
Add the objects to the ILM queue, so they can be reevaluated against current ILM rules and policy

Steps

Click S3 > Buckets.
Select a bucket from the list.
Click Configure Last Access Time.
Select the check box if you to want to update the last access time when retrieving an object in this bucket, or unselect the box to if you want to disable last access time updates.

Attention: Updating the last access time when an object is retrieved can reduce performance, especially for small objects
Click Save.