Memcached Instance Specifications

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

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 Memcached instances are available in single-node and master/standby types.

Single-Node Instances

For each single-node DCS Memcached 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 Memcached 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	42/128	50,000
4	3.2	5000/50,000	64/192	100,000
8	6.8	5000/50,000	64/192	100,000
16	13.6	5000/50,000	85/256	100,000
32	27.2	5000/50,000	85/256	100,000
64	58.2	5000/50,000	128/384	100,000

Master/Standby Instances

For each master/standby DCS Memcached instance, the available memory is less than the total memory 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 Memcached 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	42/128	50,000
4	3.2	5000/50,000	64/192	100,000
8	6.8	5000/50,000	64/192	100,000
16	13.6	5000/50,000	85/256	100,000
32	27.2	5000/50,000	85/256	100,000
64	58.2	5000/50,000	128/384	100,000