What is Elastic Block Storage?

Last updated:2020-07-06 17:24:00

Elastic Block Storage (EBS) provides block-level data storage for Kingsoft Cloud Elastic Compute (KEC) instances. It features high availability, high reliability, flexibility, and ease of use. With the architecture of three distributed replicas, EBS guarantees the reliability of data storage for KEC instances.

EBS provides EBS volumes of different types and specifications. EBS volumes can be attached to any running KEC instance in the same availability zone (AZ) to meet the requirements for stable and low-delay storage. EBS volumes can be attached to and detached from KEC instances in an AZ. Their capacity can be adjusted quickly to meet the changing requirements for data storage.

EBS supports automatically replicating data into three replicas in an AZ to store your data on the physical machines of different racks. This prevents data loss and other problems caused by single physical machine failure, and improves data availability and persistence. Based on different performance requirements, EBS volumes are categorized into solid state drive (SSD) volumes and enhanced hard disk drive (EHDD) volumes. You can purchase, adjust, and manage EBS volumes in the console with ease.

The lifecycle of an EBS volume is independent of that of a KEC instance. The operations to create and delete an EBS volume are not affected by the running time of the relevant KEC instance. You can attach multiple EBS volumes to the same KEC instance. You can also detach an EBS volume from a KEC instance and attach it to another KEC instance. If a KEC instance expires and is released, the attached EBS volumes are not released and the data on the EBS volumes is not affected.

EBS 3.0 is the latest generation of the block storage system independently developed by Kingsoft Cloud. It not only features high availability, high reliability, flexibility, ease of use, and elastic capacity expansion, but also supports snapshots. The snapshots can prevent data loss due to misoperation, tampering, and attacks, and restore data to the business state at the time when a snapshot is created through snapshot 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.

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