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, and 5.0. The following table describes the differences between these versions.

  Table 1 Differences between Redis versions

  Feature	Redis 3.0	Redis 4.0 and Redis 5.0
  Instance deployment mode	Based on VMs	Containerized based on physical servers
  Time required for creating an instance	3–15 minutes, or 10–30 minutes for cluster instances.	8 seconds
  QPS	100,000 QPS per node	100,000 QPS per node
  Instance type	Single-node, master/standby, and Proxy Cluster	Single-node, master/standby and Redis Cluster
  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.
  Scale-up or 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

  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>.