Tencent Cloud offers an array of flexible, cost-effective, and user-friendly data storage devices for cloud server instances. Each storage device boasts distinct performance and pricing, catering to various use cases.
Storage Devices
Storage devices can be divided into the following categories by dimension:
Dimension
Type
Note
Use Cases
System Disk
Used to store the collection of systems that control and schedule the operation of CVM. It uses images.
Cloud Block Storage (CBS) is an elastic, highly available, highly reliable, low-cost, and customizable network block device that can be used as a standalone scalable disk for CVM. It provides data storage at a data block level and employs a 3-copy distributed mechanism to ensure data reliability.
Cloud server instances with cloud disks can adjust hardware, disk, and network configurations.
Object storage is an internet-based data storage device that allows data retrieval from cloud server instances or any location on the internet, thus reducing storage costs. It is not suitable as a storage medium for low-latency, high I/O scenarios.
Block storage device mapping
Each instance has a system disk to ensure basic operational data and can mount additional data disks. Instances use block storage device mapping (device-mapping) to map these storage devices to recognizable locations.
Block storage is a storage device divided into blocks in bytes and supports random access. Tencent Cloud supports two types of block storage devices: local disks and cloud disks.
This diagram illustrates how CBS maps block storage devices to cloud servers: mapping /dev/vda to the system disk and mapping two data disks to /dev/vdb and /dev/vdc, respectively.
Cloud server instances automatically create block storage device mappings for local disks and cloud disks mounted on them.
