# EMS

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The dual EMS servers work in master-slave mode. Normally, the EMS 0 is the master server, while the EMS 1 is slave one. The master server takes all the tasks while the slave one is only responsible for synchronizing its database with the master. The slave EMS server becomes to the master when the master fails. The basic status of the EMS server is described in the following table.

Basic Status | Descriptions | Alarm Conditions
Basic status | Overall status | Any failure
Refresh time | Time of the last refreshment | Main process stops running
Dual server mode | The dual server integration status (master or slave) | --
Log information | For identification purpose only | --

The EMS processes are described below:

Process | Definition
mysqld | Database service
httpd | HTTP (web page) service
omcMain | omcMain comprises the following modules: •beatProc: Real time receive heartbeat (status report and alarm log) from all system devices, write to the EMS database, and update to the EMS share memory to display the real time status for customer. •beatSend: Broadcast EMS's heartbeat.
iptrans | IP package transceiver
paraComm | System parameter maintenance module based on the SNMP module, used to process command, repack and send message, and process response from application servers.
subsComm | Subscriber parameter maintenance module based on the SNMP module, used to process command, repack and send message, and process response from application servers.
logCollector | Check and collect the statistics from system devices, process the original statistics into organized statistics, write to the database and update to the share memory.
omcCleaner | Regularly check network connectivity, clear database and log files.
smcli | SMCLI process, provide Subscriber Management Command Line Interface
cdrCollector | Check and collect the CDR of system devices, write to the database and update to the share memory.
subsDataBackup | Daily synchronize subscriber data with application servers.
ftpSend | Regularly transfer CDR data to customizing server and directory by FTP.
alarmAgent | Convert external alarm into internal message.
NRTRDE | Daemon process for Near Real Time Roaming Data Exchange.
sftpSend | Regularly transfer NRTRDE data to customizing server and directory by secure FTP.

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