Server Monitoring

Revision as of 21:24, 4 April 2008 by Bburtin (talk | contribs)

Server Monitoring

Stats Collection

One of the coolest things about working with ZCS is that it exposes you to many technologies such as Java, Postfix, OpenLDAP, and MySQL. An administrator of a ZCS system should have a working knowledge of these technologies, in order to monitor system performance and solve performance problems.

The ZCS server collects many performance-related statistics. The data is stored in CSV files in /opt/zimbra/zmstat and its subdirectories:

  • cpu.csv: CPU utilization
  • fd.csv: file descriptor count
  • mailboxd.csv: ZCS server and JVM statistics
  • mtaqueue.csv: Postfix queue
  • proc.csv: disk utilization
  • soap.csv: SOAP request processing time
  • threads.csv: JVM thread counts
  • vm.csv: Linux VM statistics (from the vmstat command)

These files are in a standard CSV format that can be loaded into Excel for viewing and charting. We also provide a command-line utility called zmstat-chart that generates charts from the CSV data:

$ zmstat-chart -s /opt/zimbra/2008-04-03 -d ~/charts

will read data from CSV files in /opt/zimbra/2008-04-03 and write HTML and PNG files to the ~/charts directory. Default chart parameters are specified in /opt/zimbra/conf/zmstat-chart.xml. An alternate chart conf file can optionally be specified with the -c option.

Chart Analysis

CPU utilization is graphed both at the server level and the process level. Here's a sample process CPU graph: ProcCpu.png This graph shows how server CPU increases in the morning as users come to work and a spike at 9:00AM. To further investigate the problem, you could look at other charts or the server logs to determine what happened at 9:00AM to cause the heightened system load.

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