If I recall correctly, the following requires the Open Manage Server Administrator (or something equivalent) be installed and functional. On Windows there's a service OM installs with 'DSA' in the name that must be running.
This what I'm currently using for a PE R810 which should be identical regarding this unless it depends on the level of iDRAC you have. I have an Enterprise iDRAC license. I don't know if the iDRAC license matters:
1.3.6.1.4.1.674.10892.1.700.20.1.6.1.2
This returns the temp in the number of tenths of a degree C. I divide the result by 10 to get values like 22.5 C.
I also check the temp 'status' using:
1.3.6.1.4.1.674.10892.1.700.20.1.5.1.2
According to the Dell mib document I read, below are the values of that sensor and there meanings:
other(1) The object’s status is not one of the following:
unknown(2) The status of the object is unknown.
ok(3) The status of the object is OK.
nonCriticalUpper(4) The object is at the noncritical upper limit.
CriticalUpper(5) The object is at the critical upper limit.
nonRecoverableUpper(6) The object is at the nonrecoverable upper limit.
nonCriticalLower(7) The object is at the noncritical lower limit.
criticalLower(8). The object is at the critical lower limit.
nonRecoverableLower(9) The object is at the nonrecoverable lower limit.
failed(10) The status of the object is failed.
After struggling with trying to get what I was looking for in tems of OID values and mib documentation I finally feel like I have what I'm looking for. I have a PE R810 and several R820's and R720's. I monitor quite a few OIDs.
If you're having problems figuring out how to monitor something on your R710, let me know. I might be able to help.
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