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    Cloud Disk Types

    Last updated: 2024-12-19 16:32:17
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      Cloud Block Storage (CBS) provides highly available, highly reliable, low-cost, and customizable network block device that can be used as a standalone and expandable disk for CVMs. CBS stores data at the data block level in a three-copy distributed mechanism to ensure data reliability. CBS is classified into five types: Premium Disk, Balanced SSD, Cloud SSD, Enhanced SSD, and Tremendous SSD. Each type has unique performance and characteristics, and the price varies, making CBS suitable for different use cases.

      Notes

      Currently, Enhanced SSD and Tremendous SSD are only available in certain availability zones. They will be supported in more availability zones.
      The performance of Enhanced SSD is only guaranteed when it's attached to S5, M5, and SA2 models created after August 1, 2020, and all later generation models.
      Tremendous SSD is exclusively available for purchase with certain instance types. It is not supported by other types of cloud servers.
      Tremendous SSD cannot be used as the system disk.
      Enhanced SSD and Tremendous SSD cannot be upgraded from other disk types.

      Overview

      Premium Disk
      Premium Disk is a hybrid storage solution launched by Tencent Cloud, providing near-solid-state storage performance through the Cache mechanism. It is suitable for medium to small-scale use cases such as Web/App servers, business logic processing, and medium to small-scale website construction, all of which require high data reliability and moderate performance needs.
      Balanced SSD
      Balanced SSD is an entry-level all-flash block storage product. It's highly cost-effective and suitable for medium applications with high requirements for data reliability and standard requirements for performance, such as Web/App servers, business logical processing, KV services, as well as basic database services.
      Cloud SSD
      Cloud SSD, provided by Tencent Cloud, is an all-flash storage type based on NVMe SSD storage media, providing low latency, high random IOPS, and throughput I/O services. It is suitable for scenarios that demand high I/O performance.
      Enhanced SSD
      Enhanced SSD, designed by Tencent Cloud based on a new-generation storage engine and leveraging all NVMe SSD storage media along with the latest network infrastructure, is a product type that employs a triple-replica distributed mechanism to provide low latency, high random IOPS, and high throughput I/O services. It is suitable for I/O-intensive scenarios such as large databases and NoSQL, which require low latency. Enhanced SSD supports independent configuration of performance and capacity, allowing you to configure the storage capacity and performance according to the actual needs of your business.
      Tremendous SSD
      Tremendous SSD is powered by Tencent Cloud's latest high-performance distributed storage engine, high-speed network infrastructure, and the latest storage hardware. It boasts long-term and stable performance with ultra low latency. It is suitable for I/O-intensive and throughput-intensive workloads that require ultra low latency, such as large databases (MySQL, HBase, Cassandra, etc.), key-value storage models (etcd, rocksdb, etc.), log search service (Elasticsearch, etc.), and real-time high-bandwidth businesses (video processing, live streaming, etc.). It performs well in key transaction workloads, core database services, large-scale OLTP services, video processing, and other scenarios. Uniquely, the performance and capacity of Tremendous SSD cloud disks can be independently adjusted to meet your requirements.

      Performance metrics

      The table below compares the performances of the five CBS services.
      Performance Metric
      Tremendous SSD
      Enhanced SSD
      Cloud SSD
      Balanced SSD
      Premium Disk
      Max capacity of a single disk (GB)
      32,000
      32,000
      32,000
      32,000
      32,000
      Max IOPS of a single disk
      Up to 1,000,000 after stacking extra performance
      Up to 1,00,000 after stacking extra performance
      26,000
      10,000
      6000
      Random IOPS performance
      Baseline Performance: Random IOPS = Min {4000 + Capacity (GiB) x 100, 50000}
      Extra Performance: Max IOPS = Min {Extra Performance Value x 128, 950000}
      Baseline Performance: Random IOPS = Min {1800 + Capacity (GiB) x 50, 50000}
      Extra Performance: Max IOPS = Min {Extra Performance Value x 128, 50000} For details, see Enhanced SSD Performance
      Random IOPS = Min {1800 + Capacity (GiB) x 30, 26000}
      Random IOPS = Min {1800 + Capacity (GiB) x 15,10000}
      Random IOPS = Min {1800 + Capacity (GiB) x 8, 6000}
      Max throughput of a single disk (MB/s)
      Up to 4,000 MB/s with extra performance
      Up to 1,000 MB/s with extra performance
      260 MB/s
      190 MB/s
      150 MB/s
      Throughput performance (MB/s)
      Baseline Performance: Throughput = Min {120 + Capacity (GiB) x 0.5, 350}
      Extra Performance: Throughput = Min {Extra Performance Value x 1, 3650}
      Baseline Performance: Throughput = Min {120 + Capacity (GiB) x 0.5, 350}
      Extra Performance: Throughput = Min {Extra Performance Value x 1, 650}For details, see Enhanced SSD Performance
      Throughput = Min {120 + Capacity (GiB) x 0.2, 260}
      Throughput = Min {100 + Capacity (GiB) x 0.2, 190}
      Throughput = Min {100 + Capacity (GiB) x 0.15, 150}
      Single-path random read/write latency
      0.1 - 0.5 ms
      0.3 - 1 ms
      0.5 - 3 ms
      0.5 - 3 ms
      0.8 - 5 ms
      Note
      Tremendous SSD is exclusively available for purchase with certain instance types (enhanced storage standard S5se, standard SA3, standard S6, standard SA5, standard S8, and memory-optimized MA5). They cannot be used with other types of cloud servers, nor can they be purchased as standalone products.
      The max IOPS and max throughput performance of a single disk of Tremendous SSD are limited by the type of instance to which it is attached. Currently, the maximum performance of a single disk is reached exclusively when Tremendous SSD is attached to an S5se instance type. The metric information of the maximum achievable storage performance for different instance types are subject to continuous updates, and we encourage you to stay informed.
      The performance of Enhanced SSD is only guaranteed when it's attached to S5, M5, and SA2 models and all later generation models.
      The max IOPS and the max throughput performance of a single disk of Enhanced SSD are limited by the type of instance to which it is attached. Currently, only when Enhanced SSD is attached to the latest generation instances (S6 and SA3), the maximum performance of a single disk can be achieved. Note that the metric information on the achievable maximum storage performance for different instance types will be continuously updated.
      N/A
      N/A
      N/A
      
      Note:
      The main difference among cloud disks is the I/O performance.
      The max IOPS performance is tested out in 4 KiB I/O cases, and the max throughput is tested out at 256 KiB I/O cases. For specific test methods, see Measuring cloud disk performance.

      Application Scenarios

      Enhanced SSD is more suitable for latency-sensitive or I/O-intensive scenarios, including:
      High performance and high data reliability: Suitable for high-load and core critical business systems. Features comprehensive data backup, snapshot, and second-level data recovery capabilities.
      Medium and large databases: Support medium and large relational database applications that contain tables with millions of rows, such as MySQL, Oracle, SQL Server, and MongoDB.
      Large NoSQL: Support NoSQL businesses such as HBase and Cassandra.
      Elasticsearch: Support low-latency ES storage.
      Video service: Suitable for applications with high requirements for storage bandwidth, such as audio/video encoding and decoding, live streaming and recording playback.
      Big data analysis: Suitable for data analysis, data mining, business intelligence, and other fields. Provide distributed processing capabilities for data at TB and PB levels.
      Tremendous SSD is more suitable for latency-sensitive scenarios that require ultra low latency, including:
      Key-value (KV) storage: Support rocksdb, etcd, etc. The KV storage service generally writes data to disk in the serial I/O mode, which requires ultra low latency. The single thread latency determines the overall system performance. Tremendous SSD guarantees the latency as low as tens of microseconds, making it fit for core business systems with high requirements for data reliability and availability.
      Large databases: Support medium and large relational database applications that contain tables with millions of rows, such as MySQL, Oracle, SQL Server, and MongoDB.
      Large NoSQL: Support NoSQL businesses such as HBase and Cassandra.
      Elasticsearch: Support low-latency ES storage.
      Video service: Suitable for applications with high requirements for storage bandwidth, such as audio/video encoding and decoding, live streaming and recording playback.
      Core business systems: Suitable for I/O-intensive applications and other core business systems with high requirements for data reliability.
      Big data analysis: Suitable for data analysis, data mining, business intelligence, and other fields. Provide distributed processing capabilities for data at TB and PB levels.
      High performance and highway data reliability: Suitable for high-load and core critical business systems. Features comprehensive data backup, snapshot, and second-level data recovery capabilities.
      Cloud SSD is applicable for applications with high and medium loads, including:
      Medium databases: Medium and large relational database applications, such as MySQL.
      Image processing: Support data analysis and storage businesses, such as image processing.
      Balanced SSD is mainly used in the following data scenarios: Medium applications with high requirements for data reliability and standard requirements for performance, such as Web/App servers, business logical processing, KV services, as well as basic database services.
      Premium Disk is mainly suitable for the following data scenarios:
      Small and medium databases and Web/App servers. Provide long-term and stable I/O performance.
      Scenarios that require balanced storage capacity and performance, such as enterprise office services.
      Core business testing and the front and back end debugging.

      Billing Description

      For pricing details of cloud disks, see Price Overview.
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