Redis 3.0 Instance Specifications (Discontinued)

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.

DCS Redis 3.0 instances are available in single-node, master/standby, and Proxy Cluster types.
DCS for Redis 3.0 is no longer provided. You can use DCS for Redis 4.0, 5.0, or 6.0 instead.

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)	Specification Code (spec_code in the API)
2	1.5	5000/50,000	42/512	50,000	dcs.single_node
4	3.2	5000/50,000	64/1536	100,000	dcs.single_node
8	6.8	5000/50,000	64/1536	100,000	dcs.single_node
16	13.6	5000/50,000	85/3072	100,000	dcs.single_node
32	27.2	5000/50,000	85/3072	100,000	dcs.single_node
64	58.2	5000/60,000	128/5120	100,000	dcs.single_node

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)	Specification Code (spec_code in the API)
2	1.5	5000/50,000	42/512	50,000	dcs.master_standby
4	3.2	5000/50,000	64/1536	100,000	dcs.master_standby
8	6.4	5000/50,000	64/1536	100,000	dcs.master_standby
16	12.8	5000/50,000	85/3072	100,000	dcs.master_standby
32	25.6	5000/50,000	85/3072	100,000	dcs.master_standby
64	51.2	5000/60,000	128/5120	100,000	dcs.master_standby

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
Total Memory (GB)	Available Memory (GB)	Max. Connections (Default/Limit) (Count)	Assured/Maximum Bandwidth (Mbit/s)	Reference Performance (QPS)	Specification Code (spec_code in the API)
64	64	90,000/90,000	600/5120	500,000	dcs.cluster
128	128	180,000/180,000	600/5120	500,000	dcs.cluster
256	256	240,000/240,000	600/5120	500,000	dcs.cluster
512	512	480,000/480,000	600/5120	500,000	dcs.cluster
1024	1024	960,000/960,000	600/5120	500,000	dcs.cluster

Pay-per-use Proxy Cluster DCS Redis instances are available in 64 GB, 128 GB, and 256 GB.
Yearly/Monthly Proxy Cluster DCS Redis instances are available in 64 GB, 128 GB, 256 GB, 512 GB, and 1024 GB.
Currently, only the CN-Hong Kong region supports yearly/monthly billing. If you need to use this billing mode in other regions, submit a service ticket on the console to request the technical personnel to enable the function for you in the background.

Parent topic: DCS Instance Specifications

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