Knowledge Base
Planning large installations of IPCheck Server Monitor
When planning large installations of IPCheck Server Monitor, there are several parameters to take into account that influence the maximum number of Users/Servers/Sensors that can be monitored using one single installation.
Memory Usage
Per user you must supply about 5 KB of RAM. Per sensor you must supply about 5 KB of RAM without the recent history graphs and about 10k with recent history graphs enabled. Sample calculation:
- 1000 users with 5 sensors each
- 1000x5kb plus 5x1000x10kb => 55 MB RAM
Note: To keep system performance up, this memory should be physically accessible at any time to avoid slow pagefile swapping!
CPU Load
A monitoring load of 30 requests/s (about 2.000 requests per minute) creates a CPU load of about 20% on a 2 GHz Intel machine. With an agressive configuration we would recommend not to cross 40-50% CPU load (e.g. to save CPU cycles for the webserver) which gives us about 5.000 requests per minute, preferrably using a multi processor machine. Sample calculation:
- 1000 users with 5 sensors each with an interval of 1 minute
- 5x1000 = 5.000 requests per minute
BTW: By simply allowing the users a minimum interval of e.g. 5 minutes this load can be lowered to 1.000 requests per minute, etc.
Network Load
Per monitoring request about 200 bytes of internal communication plus the traffic for the sensor (from a few bytes for a PING up to several kb for an HTTP request) is transferred. Using an average of e.g. 1 kb per sensor request a monitoring of 5.000 requests per minute creates a bandwidth load of about 100-150 kb/s.
Plus, the traffic of the webserver, which is tiny compared to this.
Applies to: Version 4 or later