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AMI Smart Meter Reading Solution V200R010C10 Planning and Design Guide

This document describes the overall and detailed design of functions and services in the AMI Smart Meter Reading Solution.
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EEM Reliability Design

EEM Reliability Design

In the AMI solution, the EEM and DCP provide the device control management channel and data collection platform, receive instructions from the application system, and connect to and manage onsite devices. The EEM is the device management and maintenance platform; therefore, EEM reliability is the key to ensuring that the application system can properly manage devices. An EEM cluster is often deployed to ensure EEM reliability.

Three servers need to be deployed in the EEM cluster. The EEM cluster can work properly when one server fails. Nodes in the EEM cluster share data; therefore, services are not affected if any EEM node becomes faulty.

The service reliability of the EEM is implemented through load balancing, and the Nginx achieves load balancing. When the Nginx and EEM deployed on the same device, 2 million concurrent connections can be set up, the forwarding rate at Layer 7 is 20000 per second, and load balancing is implemented.

In the AMI solution, the Nginx uses the active/standby mode to ensure reliability of the load balancing service. Among EEM nodes of the EEM cluster, any two EEM nodes are used as Nginx servers. The Nginx servers work in active/standby mode and communicate with other components through floating IP addresses. The standby Nginx server uses the heartbeat IP address to detect the status of the active Nginx server. When the active Nginx server fails, the floating IP address is switched to the standby Nginx server and the standby Nginx server becomes the active one.

Updated: 2019-03-07

Document ID: EDOC1100069579

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