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It depends on your device. Is this a host? A NAS box? Just a disk unit? Is it SNMP-aware?
Our SAN units support SNMP, and so are configured to send SNMP traps to the Nagios box. This uses the snmptrapd to catch traps and feed them into the Nagios command file as external check results (homegrown script, but very simple)
You could also use SNMP to poll the device directly, as many device MIBs will have a 'health status' OID (or more than one) that you can check with the normal check_snmp script.
_________________ Steve Shipway UNIX Systems, ITSS, University of Auckland, NZ Woe unto them that rise up early in the morning... -- Isaiah 5:11
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