Embedded Server Management
esm0 at mainbus?
driver provides support for the monitoring
of the environmental sensors present in a variety of Dell servers. The
hardware monitoring is accessed via the
Devices compatible with the esm
driver can provide
an arbitrary set of sensors which may include the following types:
Sensor data is updated every 10 seconds.
The Embedded Server Management framework has been replaced in more recent Dell
systems with the Intelligent Platform Management Interface. Servers using the
Intelligent Platform Management Interface may be monitored by the
ESM provides watchdog(4)
functionality. Once configured, if the watchdog is not reset within a certain
period of time, it will timeout and the server will reset. The reset will
occur regardless of the recoverability of the hang or crash.
Example of enabling a watchdog:
# sysctl kern.watchdog.period=10
In this case if the watchdog is not reset, it'll reboot the server after roughly
Example of disabling the watchdog:
# sysctl kern.watchdog.period=0
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