High-Performance and High-Reliability Data Storage
CBS can efficiently support hot migration of CVM and avoid business interruption caused by physical failures in advance. CBS provides three copies of data redundancy, with perfect data backup, snapshot and second-level data recovery capabilities. It is suitable for high-load and core critical business systems.
Elastic Scale-out
Cloud disks can be freely attached and detached within the same availability zone without shutting down or restarting the CVM. The capacity of cloud disks can be elastically configured and expanded on demand.

Massive Data Analysis

In the typical Spark-HDFS offline data analysis framework, RDD read/write and shuffle write are sequential I/O for disk read/write. Only shuffle read I/O is random I/O, and the proportion of sequential I/O is as high as 95%. CBS has excellent multi-thread concurrent throughput performance and efficiently supports offline processing data of Hadoop-Mapreduce, HDFS, Spark, and TB/PB levels.

Multiple disks are concurrent, and the throughput performance of a single HDFS cluster can reach 1GB/s.

Deployment Environment
Five CVM instances with 12 cores and 40 GB RAM, simulating the offline data to analyze 1.5TB data volume.

Test Performance

Each CVM has one attached HDD cloud disk of 1 TB. Five HDD cloud disks provide a read speed of 500 MB/s, and the data is read into memory in 50 minutes.
Each CVM has one attached SSD of 1 TB, and the data is read into memory in 25 minutes.

Core Database

A SSD is suitable for scenarios requiring high I/O performance and high data reliability. It is particularly suitable for medium-to-large relational database applications such as PostgreSQL, MySQL, Oracle, and SQL Server, I/O-intensive core workload systems with high data reliability requirements, and medium-to-large development and test environments with high data reliability requirements.

Deployment Environment
Four CVM instances with 4 cores and 8 GB RAM, each attached with one 800G SSD and deployed with MySQL version 5.5.42.

Test Performance
Simulate the OLTP performance test with sysbench. The test set has 10 million records, TPS up to 1616 and QPS up to 29000. A single disk is enough to support tens of thousands of online simultaneous transactions per second.