Amazon S3 Storage Classes Overview - STANDARD, STANDARD_IA, ONEZONE_IA, REDUCED_REDUNDANCY(deprecated)
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Amazon S3 Storage Classes

Amazon S3 Storage Classes Overview

Each object in Amazon S3 has a storage class associated with it. Storage class defines how your object is stored on Amazon S3 and how you can access it. The prices may vary for different storage classes and you may save on your storage costs if you choose correct storage class for your use case.

There are two main groups of storage classes:

  • Storage Classes for Frequently Accessed Objects
    - suitable for performance-sensitive use cases
  • Storage Classes for Infrequently Accessed Objects
    - designed for long-lived and infrequently accessed data.

Storage Classes for Frequently Accessed Objects

  • STANDARD - default storage class, the most cost efective solution for many use cases.
  • REDUCED_REDUNDANCY - an obsolete/deprecated storage class (click here for more details), the most expensive one and your data is stored with less redundancy than the STANDARD storage class. Switch to STANDARD storage class recommended.

Storage Classes for Infrequently Accessed Objects

  • STANDARD_IA designed for long-lived and infrequently accessed data. Objects you store under the STANDARD_IA storage class are duplicated on multiple geographically separated Availability Zones (similar to STANDARD storage class). STANDARD_IA objects are resilient to the loss of an Availability Zone resulting from disasters, such as earth quakes and floods.
  • ONEZONE_IA is also designed for data that is not frequently accessed, but objects are stored in only one Availability Zone, which makes it less expensive than STANDARD_IA. However, the data is not resilient to the physical loss of the Availability Zone.

Amazon S3 charges a retrieval fee for these objects, so they are most suitable for data that is not accessed frequently.

These classes are suitable for objects larger than 128 KB that you plan to store for at least 30 days. If an object is less than 128 KB, Amazon S3 charges you for 128 KB. If you delete an object before the 30-day minimum, you are charged for 30 days. We recommend to check Amazon S3 pricing for more details.


GLACIER Storage Class

The GLACIER storage class differs from other storage classes. It was designed for data that will be stored for decades without the need to access. As of Oct 2018, this is the cheapest storage class on AWS. You pay when you need to access your data (see the pricing for more details).

The data you store under the GLACIER storage class is not available for real-time access. You need to restore the objects before you access them. Please check out these instructions for more details on how to restore the files stored under the GLACIER storage class.

In order to move your object to the GLACIER change storage class you need to configure Bucket Lifecycle Rules. There is no way to apply this storage class during uploading.

The GLACIER storage class offers the same durability and resiliency as STANDARD.


To check Storage Class for a particular file

S3 Browser allows you to easily determine what storage class is used for a particular file.

When you browse an S3 Bucket, all files and folders are displayed in the Files table. The 5th column shows the Storage Class of a file. This information is returned with bucket listing, so no extra API calls required.

file storage class

File's Storage Class is displayed in the 5th column of the Files table.


Storage Class is also displayed in files' properties on the Properties Tab.

what storage class is used for an object

File Properties shows the storage class for an each file


To switch between storage classes

With S3 Browser you can easily switch between storage classes. Storage class can be changed for one or multiple files/folders, or for entire bucket.

To edit Storage Class for one or multiple files

1. Select the file(s) you want to change storage class for and click:

Files, Change Storage Class to.., [Storage Class]

how to enable rrs for one or multiple files

Select one or multiple files and right-click on them to show context menu.


To switch storage class for entire bucket

With S3 Browser you may also change storage class for entire bucket, the steps are very similar to the described above:

1. Select the bucket and click

Buckets, Change Storage Class to.., [Storage Class]

change storage class for entire bucket

Right-click on the bucket and choose desired storage class.

3. S3 Browser will apply selected storage class for all files inside the bucket.

If your Amazon S3 Bucket contains a lot of files, this operation may take a while. You can significantly increase performance using S3 Browser Pro. It allows you to increase the number of concurrent working threads and thereby process your files much more faster.

To automatically apply storage class during uploading.

You may also configure S3 Browser to automatically apply storage class during uploading.

1. Select the bucket and open the Properties tab:

Click Bucket->Properties enable RRS for the bucket

Select the bucket and click Buckets->Properties.

2. Click the Default Storage Class field.

Edit Default Http Header dialog will open

Edit Default Http Header dialog

Select the bucket and click Buckets->Properties.

3. Select desired storage class from the drop-down list and click Save Changes

S3 Browser will automatically apply selected storage class during uploading.

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