Redis 3.0 Instance Specifications

This section describes DCS Redis 3.0 instance specifications, including the total memory, available memory, maximum number of connections allowed, maximum/assured bandwidth, and reference performance.

The following metrics are related to the instance specifications:

Used memory: You can check the memory usage of an instance by viewing the Memory Usage and Used Memory metrics.
Maximum connections: The maximum number of connections allowed is the maximum number of clients that can be connected to an instance. To check the number of connections to an instance, view the Connected Clients metric.
QPS represents queries per second, which is the number of commands processed per second.

Single-Node Instances

For each single-node DCS Redis instance, the available memory is less than the total memory because some memory is reserved for system overheads, as shown in Table 1.

**Table 1** Specifications of single-node DCS Redis 3.0 instances
Total Memory (GB)	Available Memory (GB)	Max. Connections (Default/Limit) (Count)	Assured/Maximum Bandwidth (Mbit/s)	Reference Performance (QPS)
2	1.5	5000/50,000	42/512	50,000
4	3.2	5000/50,000	64/1536	100,000
8	6.8	5000/50,000	64/1536	100,000
16	13.6	5000/50,000	85/3072	100,000
32	27.2	5000/50,000	85/3072	100,000
64	58.2	5000/60,000	128/5120	100,000

Master/Standby Instances

For each master/standby DCS Redis instance, the available memory is less than that of a single-node DCS Redis instance because some memory is reserved for data persistence, as shown in Table 2. The available memory of a master/standby instance can be adjusted to support background tasks such as data persistence and master/standby synchronization.

**Table 2** Specifications of master/standby DCS Redis 3.0 instances
Total Memory (GB)	Available Memory (GB)	Max. Connections (Default/Limit) (Count)	Assured/Maximum Bandwidth (Mbit/s)	Reference Performance (QPS)
2	1.5	5000/50,000	42/512	50,000
4	3.2	5000/50,000	64/1536	100,000
8	6.4	5000/50,000	64/1536	100,000
16	12.8	5000/50,000	85/3072	100,000
32	25.6	5000/50,000	85/3072	100,000
64	51.2	5000/60,000	128/5120	100,000

Proxy Cluster Instances

In addition to larger memory, cluster instances feature more connections allowed, higher bandwidth allowed, and more QPS than single-node and master/standby instances.

**Table 3** Specifications of Proxy Cluster DCS Redis 3.0 instances
Specification (GB)	Available Memory (GB)	Max. Connections (Default/Limit) (Count)	Assured/Maximum Bandwidth (Mbit/s)	Reference Performance (QPS)
64	64	90,000/90,000	600/5120	500,000
128	128	180,000/180,000	600/5120	500,000
256	256	240,000/240,000	600/5120	500,000
512	512	480,000/480,000	600/5120	500,000
1024	1024	960,000/960,000	600/5120	500,000