Difference between Probe and Inband Health Monitoring

[ssieger]

Hi,

what is the difference between probes and IHM. Is IHM only watching the sessions of the particular serverfarm without bothering the servers with healt-checks? If that's true, what is the advantage of using "simple" probes, instead of controlling the sessions by IHM?

[Syed Iftekhar Ahmed · Accepted solution]

With probes Loadbalancer periodically sends tcp/http/icmp (which ever probe type is configured) to check the availability of the Real Server.

Where as with IHM LB passively Monitors sessions for catastrophic errors (for example, reset (RST) from the server or no response from a server) that can remove a server from

services. As per your configuration LB can take a server out of the server farm after configured number of errors.

IHM can only be used to catch basic errors (like no response or RST from servers, whereas probes can be used for more advanced health monitoring like opening TCP connections to specific ports, sending GET requests, parsing the response for a particular string etc ...

You can use both together.

Syed Iftekhar Ahmed

HTH

Syed Iftekhar Ahmed