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

[yiannis georgiou]

Hi Al,

good guess!! that was the problem and by putting the REREAD_SDR_CACHE 
flag to true everything went back to normal

my question now is if I let the flag REREAD_SDR_CACHE to true permanently
is the program going to flush / read the cache every time or only the 
first time when we make multiple calls per minute?

actually the program I'm talking about is running as a thread collecting 
power consumption information from a sensor every once in a while so if 
it's going to delay every time reading the cache then I need to put the 
value to false after the first read.

thanks a lot for your help

Best Regards
Yiannis


On 05/15/2013 07:28 PM, Albert Chu wrote:
> 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 is out of date, wrong, or corrupted for libipmimonitoring (i.e. firmware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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> > address@hidden
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