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Cloud Object Storage
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    Storage Class Overview

    Last updated: 2024-03-25 15:28:24
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      Cloud Object Storage (COS) offers the MAZ_STANDARD, MAZ_STANDARD_IA, MAZ_INTELLIGENT TIERING, INTELLIGENT TIERING, STANDARD, STANDARD_IA, ARCHIVE, and DEEP ARCHIVE storage classes for objects with different access frequency and disaster recovery levels. They indicate how active objects are in COS, and vary from one another in access frequency, durability, availability, latency, and more. You can choose which storage class to upload your objects to as needed.
      Note:
      If you did not specify the storage class when uploading an object, it will be uploaded to STANDARD by default.
      For more information on multi-AZ, see Overview of Multi-AZ Feature.

      MAZ_STANDARD/STANDARD

      Both MAZ_STANDARD and STANDARD storage classes are highly reliable, available, and powerful object storage service designed for hot data and feature low latency and high throughput.
      MAZ_STANDARD has higher data durability and service availability than STANDARD. It uses a different storage mechanism to store the data in different data centers in the same region, so as to prevent failures in one data center from affecting the entire service and further guarantee your business stability.
      Use cases
      Use cases involving lots of hotspot files or frequent data access, including trending videos, social images, mobile apps, game programs, and static websites.
      The STANDARD storage class is designed for general use and covers most use cases. It is more cost-effective than MAZ_STANDARD.
      However, MAZ_STANDARD has higher data durability and service availability, making it suitable for business scenarios with higher requirements, including key files, commercial data, and sensitive information.

      MAZ_STANDARD_IA/STANDARD_IA

      Both MAZ_STANDARD_IA and STANDARD_IA storage classes are highly reliable object storage services with low storage costs and access latency. They allow you to access the first byte in milliseconds at a reduced price, so you can retrieve data quickly without waiting. Unlike STANDARD, they involve data retrieval fees when you access data.
      MAZ_STANDARD_IA uses a different storage mechanism from STANDARD_IA to store the data in different data centers in the same region, so as to prevent failures in one data center from affecting the entire service and further guarantee your business stability.
      Use cases
      Use cases with low access frequency (for example, 1 to 2 times per month), such as cloud disk data, big data analysis, government and enterprise data, low-frequency archives, and monitoring data.
      Note:
      Both MAZ_STANDARD_IA and STANDARD_IA have minimum storage requirements. If the storage duration is less than 30 days, the bill is calculated as 30 days. Likewise, if the size of a file is smaller than 64 KB, the bill is calculated as 64 KB (if the size of a file is greater than or equal to 64 KB, the bill is calculated based on the actual file size). For more information, see Pricing | Cloud Object Storage.

      MAZ_INTELLIGENT TIERING/INTELLIGENT TIERING

      Objects in the MAZ_INTELLIGENT TIERING storage class can be stored in two storage layers: MAZ_STANDARD and MAZ_STANDARD_IA. Objects in the INTELLIGENT_TIERING storage class can also be stored in two storage classes: STANDARD and STANDARD_IA. COS will automatically switch between storage classes based on the access frequency of such objects with no data retrieval fees incurred, which reduces your storage costs. For more information, see INTELLIGENT TIERING Overview.
      MAZ_INTELLIGENT TIERING uses a different storage mechanism from INTELLIGENT TIERING to store the data in different data centers in the same region, so as to prevent failures in one data center from affecting the entire service and further guarantee your business stability.
      Use cases
      Use cases with uncertain data access patterns. If your business has tight controls on costs and is less sensitive to file reading performance, you can use MAZ_INTELLIGENT TIERING or INTELLIGENT TIERING to reduce costs.
      Note:
      For MAZ_INTELLIGENT TIERING and INTELLIGENT_TIERING, objects are billed based on their actual sizes. For more information on pricing, see Pricing | Cloud Object Storage.

      ARCHIVE

      COS ARCHIVE is a highly reliable object storage service designed for cold data, and offers very low storage costs and long-term data retention. This storage class has a minimum storage duration of 90 days. To read data stored in ARCHIVE, you need to restore it to STANDARD first.
      COS supports the following three restoration modes for ARCHIVE:
      Expedited: Restores an object within 1-5 minutes.
      Standard: Restores an object within 3-5 hours.
      Bulk: Restores objects within 5-12 hours.
      Note:
      For more information about object restoration, see Restoring Archived Objects.
      The QPS for restoration requests is limited to 100.
      Use cases
      Use cases that require long-term data retention, such as archival data, medical images, scientific data and other compliance files, lifecycle files, logs, and remote disaster recovery.
      Note:
      ARCHIVE has minimum storage requirements. If the storage duration is less than 90 days, the bill is calculated as 90 days. Likewise, if the size of a file is smaller than 64 KB, the bill is calculated as 64 KB (if the size of a file is greater than or equal to 64 KB, the bill is calculated based on the actual file size). For more information, see Pricing | Cloud Object Storage.

      DEEP ARCHIVE

      COS DEEP ARCHIVE is a highly reliable object storage service that offers the lowest storage costs and long-term data retention. This storage class has a minimum storage duration of 180 days. To read data stored in DEEP ARCHIVE, you need to restore it to STANDARD first. For more information, see Overview - DEEP ARCHIVE.
      COS supports the following two restoration modes for DEEP ARCHIVE:
      Standard: Retrieves an object within 12-24 hours.
      Bulk: Retrieves multiple objects within 24-48 hours.
      Note:
      The QPS of data restoration requests is limited to 100.
      Use cases
      Use cases that require long-term data retention, such as medical images, view data, and logs.
      Note:
      DEEP ARCHIVE has minimum storage requirements. If the storage duration is less than 180 days, the bill is calculated as 180 days. Likewise, if the size of a file is smaller than 64 KB, the bill is calculated as 64 KB (if the size of a file is greater than or equal to 64 KB, the bill is calculated based on the actual file size). For more information, see Pricing | Cloud Object Storage.

      Storage Class Comparison

      Comparison Item
      MAZ_STANDARD
      MAZ_STANDARD_IA
      MAZ_INTELLIGENT TIERING
      INTELLIGENT TIERING
      STANDARD
      STANDARND_IA
      ARCHIVE
      DEEP ARCHIVE
      Storage class parameter
      MAZ_STANDARD
      MAZ_STANDARD_IA
      MAZ_INTELLIGENT_TIERING
      INTELLIGENT_TIERING
      STANDARD
      STANDARD_IA
      ARCHIVE
      DEEP_ARCHIVE
      Data durability
      99.999999
      999%
      99.9999999
      999%
      99.9999999
      999%
      99.9999999
      99%
      99.999999
      99%
      99.9999999
      99%
      99.9999999
      99%
      99.9999999
      99%
      Service availability
      99.995%
      99.995%
      99.995%
      99.99%
      99.95%
      99.9%
      99.9%
      99.9%
      Response
      Milliseconds
      Milliseconds
      Milliseconds
      Milliseconds
      Milliseconds
      Milliseconds
      Requires restoration in advance by using one of three restoration modes:
      Expedited: Restores an object within 1-5 minutes.
      Standard: Restores an object within 3-5 hours.
      Bulk: Restores multiple objects within 5-12 hours.
      Requires restoration in advance by using one of two restoration modes:
      Standard: Restores an object within 12-24 hours.
      Bulk: Restores multiple objects within 24-48 hours.
      Minimum billable object size
      Measured by actual object size
      64 KB
      Measured by actual object size
      Measured by actual object size
      Measured by actual object size
      64 KB
      64 KB
      64 KB
      Minimum storage duration
      No limit
      30 days
      No limit
      No limit
      No limit
      30 days
      90 days
      180 days
      Supported regions
      Only Beijing, Shanghai, Guangzhou, Hong Kong (China), and Singapore
      Only Beijing, Shanghai, Guangzhou, Hong Kong (China), and Singapore
      Only Beijing, Shanghai, Guangzhou, and Singapore
      Only Beijing, Nanjing, Shanghai, Guangzhou, Chengdu, Chongqing, Tokyo, and Singapore
      All regions
      All regions
      All public cloud regions except Jakarta
      Only Beijing, Nanjing, Shanghai, Guangzhou, Chengdu, Chongqing, Tokyo, and Singapore
      Storage fees
      High
      High
      Varied by the storage class after intelligent tiering
      Varied by the storage class after intelligent tiering
      Standard
      Low
      Very low
      Ultra low
      Data retrieval fees
      None
      Rather low. Charged by the actual amount of data read
      None
      None
      None
      Rather low. Charged by the actual amount of data read
      Rather high. Charged by the actual amount of data restored depending on the restoration mode
      High. Charged by the actual amount of data restored depending on the restoration mode
      Request fees
      Standard
      Rather high
      Rather high. You will also be charged the INTELLIGENT TIERING object monitoring fees
      Rather high. You will also be charged the INTELLIGENT TIERING object monitoring fees
      Standard
      Rather high
      Standard (the data needs to be restored to STANDARD first)
      High (the data needs to be restored to STANDARD first). To retrieve DEEP ARCHIVED data, request fees for retrieving data will be incurred
      Data processing
      Supported
      Supported
      Supported
      Supported
      Supported
      Supported
      Supported (requires data restoration first)
      Supported (requires data restoration first)

      Storage Class Transition

      COS offers various storage classes to indicate how active objects are in COS. You can still change the storage class for objects as needed, or transition objects to a less active storage class such as STANDARD_IA, ARCHIVE, or DEEP ARCHIVE.
      Note:
      When transitioning objects, ensure that the target storage class is supported for the region where your object resides.
      To modify the storage class of an object stored in ARCHIVE or DEEP ARCHIVE, you need to restore it first into STANDARD. For more information, see Restoring Archived Objects.
      How each storage class can be transitioned is described as follows:
      Storage Class
      Available Target Storage Class
      Transition Priority
      MAZ_STANDARD
      MAZ_STANDARD_IA, MAZ_INTELLIGENT TIERING
      MAZ_STANDARD > MAZ_STANDARD_IA > MAZ_INTELLIGENT TIERING
      MAZ_STANDARD_IA
      MAZ_STANDARD, MAZ_INTELLIGENT TIERING
      MAZ_STANDARD_IA > MAZ_INTELLIGENT TIERING
      MAZ_INTELLIGENT TIERING
      MAZ_STANDARD, MAZ_STANDARD_IA
      None
      INTELLIGENT TIERING
      STANDARD, STANDARD_IA, ARCHIVE, DEEP ARCHIVE
      INTELLIGENT TIERING > ARCHIVE > DEEP ARCHIVE
      STANDARD
      INTELLIGENT TIERING, STANDARD_IA, ARCHIVE, DEEP ARCHIVE
      STANDARD > STANDARD_IA > INTELLIGENT TIERING > ARCHIVE > DEEP ARCHIVE
      STANDARD_IA
      INTELLIGENT TIERING, STANDARD, ARCHIVE, DEEP ARCHIVE
      STANDARD_IA > INTELLIGENT TIERING > ARCHIVE > DEEP ARCHIVE
      ARCHIVE
      INTELLIGENT TIERING, STANDARD, STANDARD_IA, DEEP ARCHIVE (after restoration)
      ARCHIVE > DEEP ARCHIVE
      DEEP ARCHIVE
      INTELLIGENT TIERING, STANDARD, STANDARD_IA, ARCHIVE (after restoration)
      None
      For detailed directions, see the following documents:
      Modifying Storage Classes
      Setting Lifecycles
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