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Documentation Elastic Block Storage (EBS) Product Introduction EBS volume types

EBS volume types

Last updated：2021-09-22 20:36:51

EBS is a block-level storage service boasting high availability, high reliability, and low cost. An EBS volume can be used as an independent and scalable disk of KEC instances. EBS 3.0 is the latest generation of the block storage system independently developed by the EBS research and development (R&D) team of Kingsoft Cloud. EBS 3.0 uses distributed clusters and triplicate storage architecture to guarantee the reliability of data storage for KEC instances. It features high availability, high reliability, flexibility, ease of use, and elastic capacity expansion. EBS 3.0 provides the snapshot feature to prevent data loss due to problems such as misoperation, tampering, and attacks. This feature allows you to restore data to the business state when a snapshot is created through rollback. EBS 3.0 uses the Redirect-On-Write (ROW) technology to create snapshots of EBS volumes. Creating snapshots does not deteriorate performance of an EBS volume and therefore does not interrupt your business. Based on different performance requirements, EBS volumes are categorized into SSD volumes and EHDD volumes. In addition to performance, the two types of EBS volumes are also different in characteristics and price. You can select the type of EBS volumes based on the characteristics of deployed applications.

SSD volumes

  • Specifications
    The capacity of an SSD volume can be 10 GB to 32,000 GB. The step for reducing or increasing the capacity is 1 GB.

  • Performance
    An SSD volume can provide a maximum of 256 MB/s I/O throughput and 25,000 random IOPS.
Type Random IOPS Throughput Latency Characteristics
SSD volumes min{1,800 + 30 × Capacity (GB), 25,000} min{120 + 0.5 × Capacity (GB), 256} MB/s Less than 2 ms Support snapshots.
  • Scenarios
    SSD volumes are applicable to scenarios where high IOPS and high I/O throughput are required. For example, you can use SSD volumes for large- and medium-sized databases, such as NoSQL, MongDB, and SQL Server databases. You can also use SSD volumes for analyzing or mining TBs or PBs of distributed data.

If the IOPS performance of the SSD volumes you purchased before June 2020 fails to reach the maximum, you can detach the SSD volumes from KEC instances and re-attach the SSD volumes.

EHDD volumes

  • Specifications
    The capacity of an EHDD volume can be 10 GB to 32,000 GB. The step for reducing or increasing the capacity is 1 GB.

  • Performance
    An EHDD volume can provide a maximum of 130 MB/s I/O throughput and 5,000 random IOPS. The latency of an EHDD volume is less than 5 ms.
Type Random IOPS Throughput Latency Characteristics
EHDD volumes min{1,800 + 8 × Capacity (GB), 5,000} min{100 + 0.15 × Capacity (GB), 130} MB/s Less than 5 ms Support snapshots.
  • Scenarios
    EHDD volumes are applicable to large- and medium-sized development and test scenarios, small databases, enterprise applications, and web servers.
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