Updated on 2022-02-21 GMT+08:00

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