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I can't recommend Nagios highly enough. Entirely free (assuming you don't count the hours required to negotiate its considerable learning curve), and extendable in just about every way - all the monitoring and alerting stuff has a modular architecture, so you can write your own plugins, pager scripts, whatever. If you're not that much of a coder, there's also a large and helpful community producing plugins of all kinds, although the bundled ones are pretty good - there are remote agents you can install on your servers, or interfaces to let you perform WMI/SNMP checks, or talk to Tivoli/OpenView server agents. There are also add-ons to extend the basic Nagios engine in useful ways, like logging performnce data to MySQL or RRDTool. The configuration is a little complicated, but with enough bullying you can get it to monitor pretty much anything that's got a network connection. Plus, once you've set up all the host parent-child relationships and extended info (IP address, circuit ID, whatever), you can use it as network documentation.

I can't recommend Nagios highly enough. Entirely free (assuming you don't count the hours required to negotiate its considerable learning curve), and extendable in just about every way - all the monitoring and alerting stuff has a modular architecture, so you can write your own plugins, pager scripts, whatever. If you're not that much of a coder, there's also a large and helpful community producing plugins of all kinds, although the bundled ones are pretty good - there are remote agents you can install on your servers, or interfaces to let you perform WMI/SNMP checks, or talk to Tivoli/OpenView server agents. There are also add-ons to extend the basic Nagios engine in useful ways, like logging performnce data to MySQL or RRDTool. The configuration is a little complicated, but with enough bullying you can get it to monitor pretty much anything that's got a network connection.

I can't recommend Nagios highly enough. Entirely free (assuming you don't count the hours required to negotiate its considerable learning curve), and extendable in just about every way - all the monitoring and alerting stuff has a modular architecture, so you can write your own plugins, pager scripts, whatever. If you're not that much of a coder, there's also a large and helpful community producing plugins of all kinds, although the bundled ones are pretty good - there are remote agents you can install on your servers, or interfaces to let you perform WMI/SNMP checks, or talk to Tivoli/OpenView server agents. There are also add-ons to extend the basic Nagios engine in useful ways, like logging performnce data to MySQL or RRDTool. The configuration is a little complicated, but with enough bullying you can get it to monitor pretty much anything that's got a network connection. Plus, once you've set up all the host parent-child relationships and extended info (IP address, circuit ID, whatever), you can use it as network documentation.

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I can't recommend Nagios highly enough. Entirely free (assuming you don't count the hours required to negotiate its considerable learning curve), and extendable in just about every way - all the monitoring and alerting stuff has a modular architecture, so you can write your own plugins, pager scripts, whatever. If you're not that much of a coder, there's also a large and helpful community producing plugins of all kinds, although the bundled ones are pretty good - there are remote agents you can install on your servers, or interfaces to let you perform WMI/SNMP checks, or talk to Tivoli/OpenView server agents. There are also add-ons to extend the basic Nagios engine in useful ways, like logging performnce data to MySQL or RRDTool. The configuration is a little complicated, but with enough bullying you can get it to monitor pretty much anything that's got a network connection.