This topic describes the specifications of Tair ESSD-based instances that use the standard architecture. These specifications include the memory capacity, maximum number of connections to each instance, and maximum bandwidth.
Tair ESSD-based instances are developed based on enhanced SSDs (ESSDs) and are compatible with core data structures and APIs of open source Redis. These instances can provide large-capacity, low-cost, and persistent database services. Compared with open source Redis, ESSD-based instances reduce costs and improve data reliability. Additionally, ESSD-based instances reduce the amount of reserved memory that is required for the forks of native Redis databases. ESSD-based instances are suitable for scenarios that store warm and cold data, and require compatibility with open source Redis, large capacity, and high access performance. For more information, see ESSD-based instances.
ESSDs are disks provided by Alibaba Cloud. For more information about the attributes and performance levels of ESSDs, see ESSDs.
Elastic Compute Service (ECS) is a high-performance, stable, reliable, and scalable IaaS-level cloud computing service provided by Alibaba Cloud. For more information, see What is ECS? ESSD-based instances use g6e, the general-purpose instance family with enhanced performance of ECS. This instance family offloads a large number of virtualization features to dedicated hardware with the use of the third-generation SHENLONG architecture to provide predictable and consistent ultra-high performance and reduce virtualization overheads. This instance family utilizes the fast path acceleration feature of chips to improve storage performance, network performance, and computing stability by an order of magnitude.
For more information about the instance families of ECS, see Instance families.
InstanceClass value (used in API operations)
Corresponding ECS instance type
Maximum number of concurrent connections
Maximum bandwidth (Gbit/s)
Number of CPU cores
Storage performance level and capacity range (GB)
4 Core - 16 GB
PL1: 20 to 80
8 Core - 32 GB
PL1: 60 to 230
PL2: 470 to 750
16 Core - 64 GB
PL1: 60 to 460
PL2: 470 to 1,230
PL3: 1,270 to 2,160
32 Core - 96 GB
PL2: 470 to 2,160
PL3: 1,270 to 4,320
52 Core - 192 GB
PL2: 470 to 3,090
PL3: 1,270 to 6,150
PL3 ESSDs perform better than PL2 and PL1 ESSDs. For more information, see ESSDs.
Only standard instances are supported.
The underlying operating system and management service of an ESSD-based instance take up memory space. For this reason, the actual available memory of the instance is 75% to 90% of the memory size specified by the instance specifications.