Re: [Freeipmi-users] sensor not found with lib ipmimonitoring

[Albert Chu]

Hi Yiannis,

That is indeed strange.  It's hard to tell from just the information you
provided, but I have a guess

Both ipmi-sensors and libipmimonitoring cache the SDR (sensor data
repository) "database" the first time it reads from the system so that
it doesn't have to do it over and over again.  It's possible that cache
is out of date, wrong, or corrupted for libipmimonitoring (i.e. firmware
update at some point, caches were created at different times, etc.).

You may wish to flush the cache (-f in ipmi-sensors, see
REREAD_SDR_CACHE flag in ipmi_monitoring.h).  You could also just delete
the cache manually.  The default location of the libipmimonitoring cache
depends on your build, but you can see the location in the
libipmimonitoring.3 manpage.

If that doesn't work, could you send me the debug output when you run
your libipmimonitoring tool.  You can turn on debugging by setting these
flags

    IPMI_MONITORING_FLAGS_DEBUG              = 0x01,
    IPMI_MONITORING_FLAGS_DEBUG_IPMI_PACKETS = 0x02,

Al

On Wed, 2013-05-15 at 16:41 +0200, yiannis georgiou wrote:
> Hello,
> 
> I have observed a strange behaviour when using ipmimonitoring library 
> from a C program to collect the value of particular sensor
> The problem was observed on a cluster of homogeneous nodes and with 
> freeipmi version 1.2.1.
> Even if ipmi-sensors command returns correctly the record id  the 
> function "ipmi_monitoring_sensor_readings_by_record_id"
> returns "sensor not found"
> 
> The strange thing is that the function works correctly on most of the 
> nodes and the problem arrives only on some nodes:
> Here are some output from our cluster. In the results the executable 
> ./test_lib_ipmi  makes use of the function 
> "ipmi_monitoring_sensor_readings_by_record_id"
> 
> so this is a node where the function works fine
> --------------------
> address@hidden ~]# ipmi-sensors -r 81
> ID | Name         | Type         | Reading    | Units | Event
> 81 | Blade Consum | Power Supply | 78.00      | W     | 'OK'
> 
> address@hidden ~]# ./test_lib_ipmi 1 81
> sensor=81
> The sensor value is in watt: 76
> ------------------------
> 
> and this is a node where it doesn't:
> 
> -------------------------
> address@hidden ~]# ipmi-sensors -r 81
> ID | Name         | Type         | Reading    | Units | Event
> 81 | Blade Consum | Power Supply | 72.00      | W     | 'OK'
> 
> address@hidden ~]# ./test_lib_ipmi 1 81
> sensor=81
> error: ipmi_monitoring_sensor_readings_by_record_id: sensor not found
> ------------------------------
> 
> Do you have any ideas why we get this behaviour? Could this be a 
> freeipmi configuration problem (related with the defaults of 
> ipmimonitoring library) or a hardware issue ?
> Let me know if you want more information to localize the problem
> 
> Thanks a lot for your help
> Best Regards
> Yiannis
> 
> 
> 
> 
> 
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-- 
Albert Chu
address@hidden
Computer Scientist
High Performance Systems Division
Lawrence Livermore National Laboratory