Memory-optimized Tair (Enterprise Edition) instances with a standard architecture provide high memory capacity with consistent throughput. This instance type is suited for memory-intensive workloads that don't require the highest raw compute performance — such as large in-memory caches, session stores, or datasets where read/write patterns are steady rather than burst-heavy.
Instance specifications
| Specification name | Specification code (for API calls) | CPU cores | I/O threads | Memory (GB) | Bandwidth | Maximum connections | QPS reference value |
|---|---|---|---|---|---|---|---|
| 1 GB master-replica | redis.amber.master.small.multithread | 6 | 4 | 1 | 768 Mbps (96 MB/s) | 30,000 | 240,000 |
| 2 GB master-replica | redis.amber.master.mid.multithread | 6 | 4 | 2 | 768 Mbps (96 MB/s) | 30,000 | 240,000 |
| 4 GB master-replica | redis.amber.master.stand.multithread | 6 | 4 | 4 | 768 Mbps (96 MB/s) | 40,000 | 240,000 |
| 8 GB master-replica | redis.amber.master.large.multithread | 6 | 4 | 8 | 768 Mbps (96 MB/s) | 40,000 | 240,000 |
| 16 GB master-replica | redis.amber.master.2xlarge.multithread | 6 | 4 | 16 | 768 Mbps (96 MB/s) | 40,000 | 240,000 |
| 32 GB master-replica | redis.amber.master.4xlarge.multithread | 6 | 4 | 32 | 768 Mbps (96 MB/s) | 50,000 | 240,000 |
| 64 GB master-replica | redis.amber.master.8xlarge.multithread | 6 | 4 | 64 | 768 Mbps (96 MB/s) | 50,000 | 240,000 |
Notes about CPU cores
One CPU core is reserved for background tasks to maintain service stability. In cluster instances and read/write splitting instances, one core is reserved per shard or read replica for the same purpose.
Bandwidth calculation rules
The bandwidth value represents the total bandwidth for an instance — the sum of the bandwidths of all shards or nodes.
The bandwidth value applies to both upstream and downstream traffic. For example, an instance with 768 Mbps (96 MB/s) of bandwidth has 768 Mbps available in each direction.
The bandwidth limit applies to shard nodes and is independent of the network connection type.
To handle burst or planned traffic peaks, adjust the instance bandwidth as needed. For instructions, see Manually increase the bandwidth of an instance.
For more details, see the Bandwidth FAQ.
FAQ
Why does my instance show a different maximum connection limit than what's listed here?
After a product upgrade, the maximum connection limit for some instance types may change. To apply the updated limit, change the instance configuration and select the current instance type as the target. For details, see Change instance configurations.