** Huawei Yunkunpeng Redis is the first ARM-based full stack integration Redis cloud service in the industry. It supports HA architecture of dual-system hot backup and provides Cluster instance types of single-machine, active/standby, Proxy Cluster and Cluster to meet business requirements of high read/write performance scenarios and elastic configuration.

Distributed cache service DCS

Compatible with both in-memory database engines, providing out-of-the-box/easy management of online distributed cache capabilities.

Distributed cache Single-node instances support concurrent read and write operations but do not persist. The original data is saved when the instance is restarted

Cache service system policy

Read and write access

Management rights: administrator rights of the distributed cache service. Users with this permission can operate all functions of the distributed cache service.

User rights: common user rights of the distributed cache service (without permission to create, modify, delete, expand, and shrink instances).

Read-only permission of the distributed cache service. Users with this permission can only view distributed cache service data.

Distributed cache service administrator permission. Users with this permission can operate all functions of the distributed cache service.

Elastic cloud server stable status

Shutdown failure during operation

A VPC is a network service

Network ACL/NAT gateway/security group Control ECS in a VPC to connect to the public network

VPC ECS isolation subnet ACL security group

Cloud database provides storage location for web disk files and shared load balancing algorithm

1. Weighted polling algorithm

Requests are distributed to the different servers in sequence, based on the weight of the back-end servers

2. Minimum connection algorithm

3. Source IP address algorithm

Huawei Cloud Relational Database Service (RDS) is an out-of-the-box, stable, reliable, flexible, scalable, and easily managed online Relational Database Service based on the cloud computing platform. Relational databases support the following engines:

MySQL

PostgreSQL

SQL Server

GaussDB T

There are two ways to use a relational database.

** Administrative console: ** You can use the Web interface provided by the administrative console to complete operations related to relational databases.

**API: ** You can write code to call apis to use a relational database, see the Relational Database API Reference.

Usage scenarios

KC1 flexible cloud server is suitable for government and enterprise financial scenarios with high requirements on independent research and development and security and privacy, Internet scenarios with high requirements on network performance, big data and HPC scenarios with high requirements on core number, and cost-sensitive site construction and e-commerce scenarios.

What is the cause of Redis migration failure?

1. If an active/standby Redis instance switchover occurs during data migration, the migration may fail. Contact technical support to disable the active/standby switchover and enable the active/standby switchover after the migration is successful.

2. If online migration is performed, check whether the SYNC and PSYNC commands are disabled for the source Redis instance. If they are disabled, enable them first to allow data synchronization.

3. If the standalone or active/standby instances are migrated to Proxy cluster instances, ensure that data exists in databases other than DB0 of the standalone or active/standby instances. If yes, migrate data to DB0 first.

A Proxy cluster does not support multiple db0s and has only one DB0.

Database instance storage type

A database system is usually the most important system in an IT system and has high requirements on storage I/O performance. You can select the storage type as required. RDS does not support changing storage types after instance creation.

Table 1 Introduction to storage types

Before the ELASTIC cloud server ECS is reinstalled or switched over, shut down the cloud server.

Cloud server backup CSBS online backup without shutdown.

Compared with open source REDis DCS Redis, the service construction time is short, safe and reliable

Monitoring o&M: easy o&M, scalable, and visualized

Describes the status of the elastic cloud server

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