[McIDAS #QLW-227820]: 20100701: McIDAS ADDE server access

Hi Patrick,

re:
> After looking at things for a while today, I'd guess your suspicions are
> correct.  I too would lean toward timeouts, as if there were this many network
> outages (several per day) we'd be seeing it in other places as well.  You 
> asked
> about the failure rate, it's very small, I saw 5 of these errors over the last
> 36 hours and there are probably about 10,000 transfers in that time period.

OK.  With this sort of duty rate, it would be less likely that there is a server
problem that needs addressing.

re:
> I see IMGCOPY commands in our log that all follow this format:
> 
> IMGCOPY GWR/POS.944 LOC/GWFDSK04I4.1 BAND=4  SIZE=SAME STY=VISR TWIN=0 MAG=-1 
> -1
> 
> with different values, so a generic entry would be:
> 
> IMGCOPY XXX/POS.XXX LOC/XXXXXXXXX BAND=X  SIZE=SAME STY=VISR TWIN=0 MAG=X X
> 
> Is there a default timeout for IMGCOPY or ADDE for these transfers?

Yes, the default timeout for ADDE is 120 seconds.  Setting the ADDE timeout
is described in the McIDAS Users Guide:

Unidata HomePage
http://www.unidata.ucar.edu

  Unidata McIDAS
  http://www.unidata.ucar.edu/software/mcidas

    McIDAS Users Guide
    http://www.unidata.ucar.edu/software/mcidas/current/users_guide/toc.html

    Appendicies
    I - McIDAS-X Site Administration and Management
    
http://www.unidata.ucar.edu/software/mcidas/current/users_guide/McIDAS-XSiteAdministrationandManagement.html#25223

    Setting the ADDE Server Timeout
    
http://www.unidata.ucar.edu/software/mcidas/current/users_guide/SettingtheADDEServerTimeout.html#16639

re:
> I see the
> TIMEOUT command being used for READs, but not the IMGCOPYs.

The timeout value is an ADDE setting.  It is the amount of time that an ADDE
transfer would have to be idle before a transfer is terminated.

re:
> Maybe we can look into using TIMEOUT to decrease the timeout to something
> fairly small so any slow transfers won't stop up the processing.

When a process is waiting for data from a server, very little CPU should
be used.  Decreasing the timeout value for ADDE would not be something
that I would try.  Increasing the timeout, however, is something I would
do if there is a worry about transferring data over a slow link.

Cheers,

Tom
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Ticket Details
===================
Ticket ID: QLW-227820
Department: Support McIDAS
Priority: Normal
Status: Closed