This topic describes the specifications of standard master-replica instances of ApsaraDB for Redis Community Edition. These specifications include the memory capacity, maximum number of connections to each instance, maximum bandwidth, and queries per second (QPS) reference value.

Instance types

Instance type InstanceClass that is used in API operations Number of CPU cores Maximum number of new connections per second Maximum number of connections Bandwidth (MB/s) QPS reference value
256 MB master-replica instance redis.master.micro.default 2 10,000 10,000 10 80,000
1 GB master-replica instance redis.master.small.default 2 10,000 10,000 10 80,000
2 GB master-replica instance redis.master.mid.default 2 10,000 10,000 16 80,000
4 GB master-replica instance redis.master.stand.default 2 10,000 10,000 24 80,000
8 GB master-replica instance redis.master.large.default 2 10,000 10,000 24 80,000
16 GB master-replica instance redis.master.2xlarge.default 2 10,000 10,000 32 80,000
32 GB master-replica instance redis.master.4xlarge.default 2 10,000 10,000 32 80,000
64 GB master-replica instance redis.master.8xlarge.default 2 10,000 10,000 48 80,000

Calculation rules for bandwidth values

  • The bandwidth value in the preceding table is the bandwidth of the instance. The bandwidth value 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 is 2,048 MB/s. The preceding table describes the upper limits. After the upper limit is reached, the bandwidth cannot be increased even if you add more shards or nodes.
  • The bandwidth value applies to the upstream and downstream bandwidths. For example, if the bandwidth of an instance is 10 MB/s, the upstream and downstream bandwidths of the instance are both 10 MB/s.
  • The bandwidth in the preceding 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 use an internal network to maximize the performance of the instance.

Calculation rules for connections

The following example shows the maximum number of new connections that can be created per second: The maximum number of new connections per second of an instance is 10,000. The maximum number of connections of an instance 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, which is calculated by using the formula 12,000 + 10,000.

FAQ

  • Q: Why is the actual bandwidth of my instance different from the bandwidth described in this topic?

    A: The bandwidth of some instance types may be adjusted after they are upgraded. If the bandwidth of your instance is different from the bandwidth described in this topic, you can change configurations and select the same specifications as the specifications of your instance to update the bandwidth. You are not charged for the same specifications. For more information, see Change specifications.

  • How do I create an instance with 256 MB of memory?

    On the Subscription tab of the buy page, you can select an instance type with 256 MB of memory.