What is Tencent Cloud Block Storage?
Tencent Cloud Block Storage (CBS) provides block-level storage for Cloud Virtual Machine (CVM) instances. It is a highly available and reliable storage medium, offering a variety of disk types to meet different read and write requirements. For more information about CBS, please refer to Overview of Cloud Block Storage.
CBS is recommended when data changes frequently, fast read and write speeds are required, and persistent data storage is needed. CBS can be mounted on any running instance in the same availability zone and can be used for instance file systems, database storage, etc. The data on CBS exists independently of the instance lifecycle. For more operations on CBS, please refer to Overview of CBS Operations.
What are the features of Tencent Cloud CBS?
Tencent Cloud CBS offers five types of cloud disks: Premium Cloud Storage, General Purpose SSD, SSD, Enhanced SSD, and Ultra-high Speed SSD. The features of CBS are as follows:
Elastic attaching and detaching: Elastic cloud disks can be attached and detached. Up to 20 elastic cloud disks can be attached to a CVM as data disks.
Elastic expansion: A single disk supports a maximum capacity of 32 TB. You can scale up the disk at any time.
Snapshot backup: CBS supports data backup through snapshot creation, enhancing data reliability and enabling quick data recovery when necessary. It also supports the creation of new cloud disks based on snapshots, facilitating rapid business deployment.
What is the difference between COS and CBS?
Object Storage: It features no file system, directory structure, file number, and space limit. It requires Web API interface for storage management and access, and provides SDK and tools for integration. It can be used independently without relying on cloud servers. Object storage supports access to large-scale data, but it is not suitable for scenarios requiring millisecond response or random read and write.
Cloud Disks: These need to be paired with a cloud server and require partitioning or formatting of the file system before they can be mounted for use. Different types of cloud disks have different performance metrics to meet various use cases.
What limits do cloud disks have?
A single elastic cloud disk can be scaled up to 32 TB, and cannot be scaled down.
Elastic cloud disks can only be mounted to CVMs within the same availability zone.
A single CVM can support up to 20 elastic cloud disks as data disks. These can be added directly when purchasing the CVM or can be attached after the CVM has been created.
Up to 50 elastic cloud disks can be purchased at once via the Cloud Block Storage Console.
If a monthly subscription elastic cloud disk is not renewed within 7 days after its expiration, the system will unmount the disk from the CVM and move it to the recycle bin. For specific recovery mechanisms, please refer to Arrears Description.
Note
At present, when a monthly subscribed elastic cloud disk is attached to a monthly subscribed cloud server, you can choose the following renewal methods based on your actual needs:
Unified expiry time with the CVM
Enable monthly auto-renewal of the cloud disks
Attach directly without enabling auto-renewal
What advantages do cloud disks have?
Cloud disks have advantages such as reliability, elasticity, high performance, ease of use, and snapshot backup. For more details, please refer to Product Advantages.
Can elastic cloud disks be used as system disks?
No. System disks cannot be attached or detached.
Can cloud disks be used as data disks?
Yes. All types of local disks and cloud disks can be used as data disks.
Can cloud disks be mounted and unmounted?
Cloud disks can be attached and detached when they are used as data disks.
System disks cannot be mounted or unmounted.