distributed-cache-service/umn/source/service_overview/comparing_redis_versions.rst

original_name

RedisDifference.html

Comparing Redis Versions

When creating a DCS Redis instance, you can select the cache engine version and the instance type.

• Version

  DCS supports Redis 3.0/4.0/5.0/6.0. The following table describes the differences between these versions.

  Table 1 Differences between Redis versions

  Feature	Redis 3.0	Redis 4.0 & Redis 5.0	Redis 6.0
  Instance deployment mode	Based on VMs	Containerized based on physical servers	Containerized based on physical servers
  Time required for creating an instance	3-15 minutes, or 10-30 minutes for cluster instances.	8 seconds	8 seconds
  QPS	100,000 QPS per node	100,000 QPS per node	150,000 QPS per node
  Instance type	Single-node, master/standby, and Proxy Cluster	Single-node, master/standby and Redis Cluster	Single-node and master/standby
  Instance total memory	Ranges from 2 GB, 4 GB, 8 GB, to 1024 GB.	Regular specifications range from 2 GB, 4 GB, 8 GB, to 1024 GB. Small specifications, such as 128 MB, 256 MB, 512 MB, and 1 GB, are also available for single-node and master/standby instances.	2 GB, 4 GB, 8 GB, 16 GB, 32 GB, and 64 GB. Small specifications (128 MB, 256 MB, 512 MB, and 1 GB) are also supported.
  Scale-up or scale-down	Online scale-up and scale-down	Online scale-up and scale-down	Online scale-up and scale-down
  Backup and restoration	Supported for master/standby and cluster instances	Supported for master/standby and cluster instances	Supported for master/standby instances

  Note

  The underlying architectures vary by Redis version. Once a Redis version is chosen, it cannot be changed. For example, you cannot upgrade a DCS Redis 3.0 instance to Redis 4.0 or 5.0. If you require a higher Redis version, create a new instance that meets your requirements and then migrate data from the old instance to the new one.

• Instance type

  Select from single-node, master/standby, and cluster types. For details about their architectures and application scenarios, see DCS Instance Types <dcs-pd-200312001>.