# Performance Enhanced master-replica Redis

Performance Enhanced master-replica Redis enhances the performance of Redis version 6.0 and adjusts the number of threads according to the capacity, providing high performance.

## Features

#### Capacity

Performance Enhanced master-replica Redis supports capacity specifications of 4,6,8,12,16,24,32,40,48,56,64, and all instances are upgraded on Kuaijie.

#### High Availability Service

It adopts a dual-machine master-replica architecture where the master node provides external access, allowing users to add, delete, modify, and query data via the Redis command line and compatible clients. In the event of a master node failure, an automatic master-slave switchover is performed to maintain uninterrupted business operations.

#### High Reliability of Data

The data persistence function is enabled by default, ensuring that all data is written to disk. It also supports a data backup feature, allowing users to restore from backups to create new instances, effectively addressing issues related to data misoperations and other concerns.

#### Compatibility

The enhanced version supports version 6.0 and is compatible with Redis protocol commands.

## Relationship between capacity memory and io_thread

| Capacity              | io_thread  | Bandwidth Limit  | 
| ------------------| ----------- | -----------  | 
| 4G, 6G, 8G, 12G, 16G, 24G, 32G  | 4  | 2Gb  | 
| 40G, 48G, 56G  | 6   | 2Gb   |
| 64G       |8    | 4Gb  | 


### Note:

The enhanced performance instances do not support the creation of slave libraries.

Only the Kuaijie data center is supported.