Comparing 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. Table 1 describes the differences between these versions. For more information about Redis 4.0 and 5.0 features, see sections "New Features of DCS for Redis 4.0 " and "New Features of DCS for Redis 5.0."

  Table 1 Differences between Redis versions

  Item	Redis 3.0	Redis 4.0 and Redis 5.0
  Open-source compatibility	Redis 3.0.7	Redis 4.0.14 and 5.0.9, respectively
  Instance deployment mode	Based on VMs	Containerized based on physical servers
  CPU architecture	x86 and Arm	x86 and Arm
  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
  Public network access	Supported	Not supported
  Domain name connection	Supported within a VPC	Supported within a VPC
  Visualized data management	Not supported	Web CLI for connecting to Redis and managing data
  Instance types	Single-node, master/standby, and Proxy Cluster	Single-node, master/standby, and Redis Cluster
  Instance total memory	Ranges from 2 GB to 1024 GB.	Regular specifications range from 2 GB to 1024 GB. Small specifications of 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

  

  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

  DCS provides single-node, master/standby, Proxy Cluster, and Redis Cluster instance types. For details about their architectures and application scenarios, see section "DCS Instance Types".