ESM(4)                OpenBSD Programmer's Manual (i386)                ESM(4)

NAME
     esm - Dell Embedded Server Management

SYNOPSIS
     esm0 at mainbus?

DESCRIPTION
     The esm driver provides support for the monitoring of the environmental
     sensors present in a variety of Dell servers.  The hardware monitoring is
     accessed via the hw.sensors sysctl(8) variable.

     Devices compatible with the esm driver can provide an arbitrary set of
     sensors which may include the following types:

           Sensor         Units
           temperature    uK
           fan            RPM
           volts          uVDC

     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 ipmi(4) driver.

WATCHDOG
     ESM provides watchdog(4) timer 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 recov-
     erability 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 10 seconds.

     Example of disabling the watchdog:

           # sysctl kern.watchdog.period=0

SEE ALSO
     intro(4), ipmi(4), watchdog(4), sensorsd(8), sysctl(8)

HISTORY
     The esm driver first appeared in OpenBSD 3.9.

AUTHORS
     The esm driver was written by Jordan Hargrave <jordan@openbsd.org> and
     David Gwynne <dlg@openbsd.org>.

OpenBSD 4.7                      May 31, 2007                                1
