Dear Amos, There can be severall different possibilities:
First of all what is behind the high time difference. The DLS stores data in blocks with a start timestamp a count of blocks and a step time.If start + count * step > next start you will get this failure. This can be caused by: -RT properties, please check your system with cyclictest (rt-test suite)! - Check your process cyclic time and execution time! - What the normal system load of the system (top)? - What is the normal IO load of the system (iotop)? - Wat is your DLS blocksize. A small blocksize compared to your data frequency will cause high HDD load. My favorite settings freq/count blocks =1, means once a second a block is written per channel. - If you have a simulink based model, NTP sync will not be a problem, because there is an internal time controller in the model. Best regards Andreas Am Freitag, dem 17.03.2023 um 15:56 +0000 schrieb Merkel, Amos: > Hi, > > Thanks for the hint! Both DLS and the control job run locally on the > same machine, so I expect they are using the same time source. I > should have mentioned that in my first post, sorry. > > However, my ntp was indeed not synchronised, as I recently turned it > off as part of my troubleshooting. I did not notice any impact from > turning it off on system level. > I turned it on again now, but do not expect a change in behaviour, as > it should have been running when the errors first occurred. > > Is there an active synchronisation of the time beyond the system > clock? > > Thank you & all the best > Amos > > -- > Amos Merkel, M.Sc. > Gruppenleiter > Digitalisierung > > ifas – Institut für fluidtechnische Antriebe und Systeme > RWTH Aachen University > Campus-Boulevard 30 > 52074 Aachen > > Tel: +49 241 80-47737 > Fax: +49 241 80-647712 > > www.ifas.rwth-aachen.de | Twitter | Facebook | YouTube | LinkedIn > > > > > > > > -----Ursprüngliche Nachricht----- > Von: Sebastien BLANCHET <blanc...@iram.fr> > Gesendet: Freitag, 17. März 2023 15:38 > An: Merkel, Amos <amos.mer...@ifas.rwth-aachen.de>; > etherlab-users@etherlab.org > Betreff: Re: [Etherlab-users] Data loss in DLS > > Hi, > > Could you check that > - DLS and the data sources are synchronized with NTP > - your NTP server works > > -- > Sebastien BLANCHET > > > On 17/03/2023 14:56, Merkel, Amos wrote: > > Hi everyone, > > > > we are experiencing weird data losses on the DLS. Everything works > > as > > expected for a couple of hours. Then, suddenly, there is a message > > in > > the logs from dlsd_logger declaring an unexpected high time > > difference > > in a number of channels followed by a message that the msr protocol > > was > > reset by the peer and dls stops logging with error code -2. Logging > > is > > continued after the preset 30 seconds, but typically crashes again > > shortly after. > > > > I am quite at loss how to proceed, there is nothing apparently > > wrong – > > the same system set-up has worked up to now, there is nothing > > unusual in > > the logs and system load (disc, cpu, network, ram) appears normal. > > The > > error appears on several systems, the only common thing appears to > > be a > > certain hardware configuration (certain somewhat older fujitsu > > desktops). Unfortunately, I do not have enough other hardware at > > hand to > > really support that theory. > > > > We work with openSUSE and installed our etherlab environment from > > the > > science:EtherLab repository using the generic network driver. We > > see the > > error on 15.2 and 15.3 systems, but haven’t managed to check 15.4 > > yet. > > > > Has anybody experienced similar behaviour before and has a hint on > > possible causes or fixes? > > > > All the best, > > > > Amos > > > > -- > > Amos Merkel, M.Sc. > > Group leader > > Digitalization > > > > ifas – Institute for Fluid Power Drives and Systems > > RWTH Aachen University > > Campus-Boulevard 30 > > 52074 Aachen > > > > Tel: +49 241 80-47737 > > Fax: +49 241 80-647712 > > > > www.ifas.rwth-aachen.de <http://www.ifas.rwth-aachen.de/>| Twitter > > <https://twitter.com/IFAS_RWTH>| Facebook > > <https://www.facebook.com/IFAS-Institut-f%C3%BCr-fluidtechnische-Antriebe-und-Steuerungen-260714043957873/ > > >| YouTube > > <https://www.youtube.com/channel/UC0vIq8jtra8E_--Sx8DALkQ>| > > LinkedIn <https://www.linkedin.com/company/ifas-rwth/> > > > > ** > > > > > > > > >
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