Re: [ldm-users] LDM tries to take Saturday off...

>My first thought is along the lines of Gilbert's. I'd recommend doing a
>scour hourly, and let it incrementally get things.
>My second thought is a local machine room server or network device reboot.
>Are you living in a Windows world where reboots are the norm and not the

Another possibility is that the filesystem is on a RAID, and the RAID has
scheduled disk checks.  Check with your System Admin person to see if that
is what is happening.  Since the problems are the same time, I'd guess that
might be the cause.

        Kevin W. Thomas
        Center for Analysis and Prediction of Storms
        University of Oklahoma
        Norman, Oklahoma
        Email:  kwthomas@xxxxxx

>On Sun, Oct 12, 2014 at 9:43 PM, Gilbert Sebenste <
>sebenste@xxxxxxxxxxxxxxxxxxxxx> wrote:
>> On Sat, 11 Oct 2014, Phil Birnie wrote:
>>  WARN: Processed oldest product in queue: 23704.5 s.
>>> WARN: pbuf_flush(): write(15,,4096) to decoder took 10 s:
>>> /home/ldm/decoders/dcgrib2 -d ldm/gempak/logs/dcgrib2_GFS.log -e
>>> GEMTBL=3D/store1/gempak/GEMPAK6.7.0/gempak/tables
>>> We never see either of these errors the rest of the week.
>>> It's very strange - there's nothing else on the system that is running a=
>>> that particular time that would slow down the machine and it's been
>>> happening for several months now.  Both of these warnings would seem to
>>> indicate a lack of resources, but I don't understand why this would occu=
>>> on Saturdays and not throughout the rest of the week.
>> Something is slowing down the machine---maybe a scour process?---causing
>> it to have an extremely long delay in writing products. Is there any way =
>> check the load average and other things to see what might be happening?
>> I have found that if the load average goes above 6 or so on my older
>> servers, it stops writing to disk and I get those errors.
>> I would check for:
>> Scouring times. Does anything just get scoured on that morning?
>> GEMPAK 6.7 has a grib decoder that can take up an entire CPU when
>> data is coming in (GEMPAK 7.1 takes care of that)
>> DNS outage? (Keep, Google's public DNS server on standby).
>> Those are off the top of my head...
>> Gilbert
>> ************************************************************
>> *******************
>> Gilbert Sebenste
>> ********
>> (My opinions only!)                                                  ****=
>> Staff Meteorologist, Northern Illinois University                      **=
>> E-mail: sebenste@xxxxxxxxxxxxxxxxxxxxx
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>Gerry Creager
>=E2=80=9CBig whorls have little whorls,
>That feed on their velocity;
>And little whorls have lesser whorls,
>And so on to viscosity.=E2=80=9D
>Lewis Fry Richardson (1881-1953)

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