Storage Types
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TencentDB for SQL Server offers five storage types: Premium local SSD, Balanced SSD cloud disk, Enhanced SSD cloud disk, SSD cloud disk, and Premium cloud disk. This document details the storage types and their applicable scenarios for TencentDB for SQL Server, helping you better select a database disk type.
Description
Storage Type | Description | Applicable Instance Architectures | Scenarios |
Premium local SSD | The High I/O local disk storage type delivers excellent I/O throughput performance. A SQL Server instance with a 90-core, 720 GB specification can achieve up to 4.5 million TPM. | Two-Node (Formerly HA/Cluster Edition) | This storage type is suitable for business scenarios that demand extremely high storage I/O performance and also have a high-availability architecture at the application layer, such as online gaming, e-commerce, ERP software service providers, video streaming, and media. |
Balanced SSD cloud disk | Tencent Cloud's entry-level all-flash block storage product offers the advantage of high cost-effectiveness. | Two-Node (Formerly HA/Cluster Edition) Single-Node (Formerly Basic Edition) | This storage type is suitable for medium-scale application scenarios that require high data reliability and moderate performance, such as Web/App servers and business logic processing. |
Enhanced SSD cloud disk | Tencent Cloud's General Purpose SSD CBS is designed with a new-generation storage engine. This product type, built on all-NVMe SSD storage media and the latest network infrastructure, employs a three-replica distributed mechanism to deliver storage services with low latency, high random IOPS, high throughput I/O capabilities, and data durability of up to 99.9999999%. | Two-Node (Formerly HA/Cluster Edition) Single-Node (Formerly Basic Edition) | This storage type is suitable for business scenarios that demand extremely high storage I/O performance and also have a high-availability architecture at the application layer, such as online gaming, e-commerce, ERP software service providers, and video streaming. |
SSD cloud disk | This all-flash storage type is provided by Tencent Cloud and is based on NVMe SSD storage media. It employs a three-replica distributed mechanism to deliver storage services with low latency, relatively high random IOPS and throughput I/O capabilities, and data durability of up to 99.9999999%. | Single-Node (Formerly Basic Edition) | This storage type is suitable for application scenarios such as I/O-intensive applications and small-to-medium relational databases. |
Premium cloud disk | This hybrid storage type is offered by Tencent Cloud. It delivers high-performance storage capabilities close to those of solid-state storage through a Cache mechanism, while ensuring data reliability by employing a three-replica distributed mechanism. | Single-Node (Formerly Basic Edition) | This storage type is suitable for small-to-medium application scenarios that require high data reliability and moderate performance, such as Web/App servers, business logic processing, and small-to-medium website development. |
Selecting a Storage Class
You can select the storage type after choosing an instance architecture on the SQL Server Purchase Page.
Comparison of Storage Class Features
Storage Type | I/O Performance | Maximum Selectable Hard Disk Capacity (GB) |
Premium local SSD | Local disks offer low I/O latency and provide better I/O throughput performance compared to CBS. | 6000 |
Balanced SSD cloud disk | It delivers moderate I/O throughput performance. | 32000 |
Enhanced SSD cloud disk | It delivers extremely high I/O throughput performance. | 32000 |
SSD cloud disk | It delivers relatively high I/O throughput performance. | 32000 |
Premium cloud disk | It delivers stable I/O performance. | 32000 |
Disk Additional I/O Performance
If the baseline disk performance of TencentDB for SQL Server cannot meet your I/O demands during business peak periods, you can enable the additional disk I/O performance feature. This feature can be configured either during or after instance creation. It effectively enhances disk I/O throughput, adapts to high-load business scenarios, and provides you with more flexible and efficient database services.
Supported Versions
Supported Architectures: Single-node, dual-node, and multi-node Cloud Disk Edition architectures, as well as read-only instances.
Supported Database Versions: All database versions currently displayed on the purchase page.
Supported Regions: The regions currently displayed on the purchase page.
Disk Baseline Performance
Storage Type | Baseline Performance Category | Calculation Formula for Baseline Performance |
Balanced SSD cloud disk | Random IOPS | min{1,800 + Capacity (GiB) x 15, 10,000} |
| Maximum throughput (MB/s) | min{100 + Capacity (GiB) x 0.2, 190} |
Enhanced SSD cloud disk | Random IOPS | Min{1,800 + Capacity (GiB) x 50, 50,000} |
| Maximum throughput (MB/s) | Min{120 + Capacity (GiB) x 0.5, 350} |
SSD cloud disk | Random IOPS | min{1,800 + Capacity (GiB) x 30, 26,000} |
| Maximum throughput (MB/s) | min{120 + Capacity (GiB) x 0.2, 260} |
Premium cloud disk | Random IOPS | min{1,800 + Capacity (GiB) x 8, 6,000} |
| Maximum throughput (MB/s) | min{100 + Capacity (GiB) x 0.15, 150} |
Feature Usage Conditions
Currently, only Enhanced SSD CBS with a storage capacity greater than or equal to 460 GB supports configuring additional disk I/O performance.
Disk Additional Performance
Storage Type | Additional Performance Category | Calculation Formula for Additional Performance |
Enhanced SSD cloud disk | Random IOPS | Min{Configuration value x 128, 50,000} |
| Maximum throughput (MB/s) | Min{Configuration value x 1, 650} |
Configuration Value: You can customize additional performance. The configuration value range is 0 - 650.
Billing for Disk Additional I/O Performance
Using additional disk I/O performance incurs charges. For billing details, see Additional Disk I/O Performance Billing.
Setting Disk Additional I/O Performance
Additional disk I/O performance can be configured either during or after instance creation. For the operation method, see Configure Additional Disk I/O Performance.
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