Storage Class

Last updated: 2020-06-05 17:08:02

    COS is available in 3 storage classes depending on the access frequency: STANDARD, STANDARD_IA, and ARCHIVE.

    When an object is uploaded, if the storage class is not set, it defaults to STANDARD.

    STANDARD

    COS STANDARD is an object storage service that provides users with high reliability, availability, and performance.

    It offers low access latency and high throughput, making it suitable for business scenarios where a massive number of trending files are accessed in real time with frequent data interactions.

    Features

    • High reliability, availability, and performance
    • Data durability: 99.999999999%
    • Service availability: 99.95%
    • Response: within milliseconds
    • Regions: all
    • Storage fees: standard

    Scenarios

    Trending videos, social networking photos, mobile apps, games, static websites, and more.

    STANDARD_IA

    COS STANDARD_IA is an object storage service that provides users with high reliability, low storage cost, and low access latency.

    It offers lower pricing for storage and keeps the first-byte access time within milliseconds, ensuring that data can be fast retrieved with no wait required. However, data retrieval incurs fees. It is suitable for business scenarios where the access frequency is low (e.g., once or twice per month).

    Features

    • Low-frequency access, real-time response
    • Data durability: 99.999999999%
    • Service availability: 99.9%
    • Minimum storage duration for billing: 30 days
    • Minimum billable object size: 64 KB
    • First-byte latency: within milliseconds
    • Regions: all
    • Storage cost: low

    Scenarios

    Online file storage, big data analytics, governmental/organizational business data, low-frequency archives, monitoring data, and more.

    ARCHIVE

    COS ARCHIVE is an object storage service that provides users with high reliability, extremely low storage cost, and long-term data retention.

    Featuring the lowest storage price, the ARCHIVE storage class needs a relatively long time to read data and is suited for archived data that needed to be stored for a long time.

    Features

    • High data durability and service availability, low cost
    • Data durability: 99.999999999%
    • Service availability: 99.9%
    • Minimum storage duration for billing: 90 days
    • Minimum billable object size: 64 KB
    • Response: requires prior restore request
    • Regions: currently only Public Cloud regions (excluding Nanjing)
    • Storage fees: very low

    Scenarios

    Archived compliance documents (e.g., archival data, medical images, and scientific materials), lifecycle files, operational logs, cross-region disaster recovery, and more.

    Comparison of Storage Classes

    Item STANDARD STANDARD_IA ARCHIVE
    Data durability 99.999999999% 99.999999999% 99.999999999%
    Service availability 99.95% 99.9% 99.9%
    Response Within milliseconds Within milliseconds Requires prior restore request
    Minimum billable object size Billed for the actual size 64 KB 64 KB
    Minimum storage duration for billing N/A 30 days 90 days
    Regions All All Only Public Cloud regions (currently excluding Nanjing)
    Storage fees Standard Low Very low
    Data retrieval fees Free Low High
    Read/Write request fees Very low Low Very low (requires data to be restored first into STANDARD)

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