This topic describes the specifications of standard hybrid-storage instances of ApsaraDB for Redis Enhanced Edition (Tair), such as the memory capacity, maximum number of concurrent connections to each instance, maximum internal bandwidth, and queries per second (QPS) reference value.

Instance specifications

Instance type InstanceClass (API operation) Maximum number of new connections per second Maximum number of concurrent connections Bandwidth (Mbit/s) QPS reference value
Master-replica instance with 16 GB memory and 32 GB disk storage redis.amber.master.16g.2x.ext4.default 10000 50000 48 40000
Master-replica instance with 16 GB memory and 64 GB disk storage redis.amber.master.16g.4x.ext4.default 10000 50000 48 40000
Master-replica instance with 16 GB memory and 128 GB disk storage redis.amber.master.16g.8x.ext4.default 10000 50000 48 40000
Master-replica instance with 32 GB memory and 64 GB disk storage redis.amber.master.32g.2x.ext4.default 10000 50000 48 40000
Master-replica instance with 32 GB memory and 128 GB disk storage redis.amber.master.32g.4x.ext4.default 10000 50000 48 40000
Master-replica instance with 32 GB memory and 256 GB disk storage redis.amber.master.32g.8x.ext4.default 10000 50000 48 40000
Master-replica instance with 64 GB memory and 128 GB disk storage redis.amber.master.64g.2x.ext4.default 10000 50000 48 40000
Master-replica instance with 64 GB memory and 256 GB disk storage redis.amber.master.64g.4x.ext4.default 10000 50000 48 40000
Master-replica instance with 64 GB memory and 512 GB disk storage redis.amber.master.64g.8x.ext4.default 10000 50000 48 40000

Calculation rules for bandwidth

  • If network resources are sufficient, the bandwidth is unlimited. However, if network resources are insufficient, the maximum instance bandwidth is limited.
  • The bandwidth value in the table is the bandwidth of the instance. It is the sum of the bandwidth of all shards or nodes on the instance.
  • The upper limit of the total bandwidth for a read/write splitting instance (as shown in the table) is 2,048 Mbit/s. After the upper limit is reached, the bandwidth cannot be increased even if the number of shards or nodes is increased.
  • The bandwidth value applies to the upstream and downstream bandwidths. If the bandwidth of an instance is 10 Mbit/s, the upstream and downstream bandwidths of the instance are both 10 Mbit/s.
  • The bandwidth listed in the table is the internal bandwidth of the ApsaraDB for Redis instance. The Internet bandwidth is determined by the internal bandwidth and is limited by the bandwidth of the connection between the instance and a client. We recommend that you connect to the instance over an internal network to maximize the performance.

Calculation rules for connections

The following example shows the maximum number of new connections that can be added per second: The maximum number of new connections per second of an instance is 10,000. The maximum number of connections is 50,000. The actual number of connections at the Nth second after the instance starts to run is 12,000. Then, at the (N+1)th second, the number of connections is 22,000 (12,000 + 10,000).