You can understand the concept, application scenarios, and functions of Tencent Cloud CBS through the following video:
What is Tencent Cloud Block Storage?
Cloud Block Storage (CBS) is a highly available, highly reliable, low-cost, and customizable block storage device that can be used as an independent, scalable disk for cloud servers, providing efficient and reliable storage capabilities for cloud server instances.
Cloud Block Storage provides persistent storage capabilities at the data block level, typically serving as the primary storage device for data that requires frequent and granular updates, such as file systems and databases. It is characterized by its high availability, reliability, and performance.
Cloud Block Storage employs a three-copy distributed mechanism, backing up your data on different physical machines to avoid data loss caused by single-point failures, thereby enhancing data reliability.
You can easily purchase, adjust, and manage your CBS devices through the console, and create storage spaces larger than a single CBS by building file systems. Depending on their lifecycle, CBS can be categorized as:
Non-elastic cloud disks
The lifecycle of a non-elastic cloud disk is completely tied to the cloud server. It is purchased alongside the cloud server and used as a system disk, with no support for mounting or unmounting.
Elastic cloud disks
The lifecycle of an elastic cloud disk is independent of the cloud server. It can be purchased separately and then manually attached to a cloud server, or it can be purchased along with a cloud server and automatically attached to it, serving as a data disk. Elastic cloud disks support mounting or unmounting on a cloud server in the same availability zone at any time. You can attach multiple elastic cloud disks to the same cloud server, or you can unmount an elastic cloud disk from cloud server A and then mount it to cloud server B.
Tencent Cloud imposes certain restrictions on the quota of CBS for users. For more details, please refer to Use Limits
Typical Use Cases
You can purchase and mount one or more cloud disks to meet the requirements for storage capacity when the disk space on your CVM is insufficient.
You don’t need to purchase extra storage capacity while purchasing a CVM. You can purchase cloud disks later when it’s necessary.
When you need to transfer data from one CVM to another, just detach the cloud data disk from the source CVM and attach it to the target CVM.
Use multiple cloud disks to form a Logical Volume Manager (LVM) to go beyond the physical limit of a single cloud disk.
Use multiple cloud disks to form a Redundant Array of Independent Disks (RAID) configuration to go beyond the I/O performance limit of a single cloud disk.
Features
Tencent Cloud offers a variety of persistent storage devices. You have the flexibility to choose the type of hard drive and perform operations such as storing files and setting up databases on the hard drive.
Five types of cloud disks are available for selection: Premium Cloud Disk, Balanced SSD, SSD, Enhanced SSD, and ulTra SSD.
Elastic Mounting and Unmounting: All types of elastic cloud disks support elastic mounting and unmounting. You can mount multiple cloud disks on a cloud server to build a large-capacity file system.
Elastic Expansion: You can scale up your cloud block storage at any time, with a single disk supporting up to 32TB.
Snapshot Backup: Supports the creation of snapshots and snapshot rollbacks, enabling timely backup and recovery of critical data. It also supports the creation of hard drives using snapshots, facilitating rapid business deployment.