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[NOAAPORT #ZLV-851048]: LDM misses data on NOAAPORT via satellite

Jim,

> I checked the settings and both machines have the same values of:
> 
> net.core.rmem_max = 212993
> net.core.rmem_default = 212992

Those are the defaults and are way too small. They should be around 25 MB, at 
least:

See 
<https://medium.com/@CameronSparr/increase-os-udp-buffers-to-improve-performance-51d167bb1360#:~:text=Linux%20places%20very%20restrictive%20limits,25MB%20is%20just%20a%20recommendation.>
 for how to do this or Google "Linux UDP receive buffer size".

> I also forgot to mention in my last email these machines are both running 
> CentOS 7

That's fine.

> I also checked the /etc/sysctl.conf and both computers correctly have the 
> entries
> already entered for:
> 
> net.ipv4.conf.default.rp_filter = 2
> net.ipv4.ipfrag_max_dist = 0

Good.

> I looked in the log files and did find a couple of things.
> 
> They are both giving an error about Couldn't connect to LDM on
> rtstatat.unidata.ucar.edu which I think is an easy fix with commenting out 
> that
> line in the ldmd.conf

Are you sure it's "rtstatat" and not "rtstats"? The latter exists; the former 
doesn't.

> On the Z400 (slower computer) it is logging a lot of errors  saying Couldn’t 
> decode
> GRIB2 message. WMO header="YVWJ48 KKCI 021900"  (just an example of one line)
> All the errors are related to this same type of thing being a GRIB2 decoding 
> error.
> 
> I do not currently run those items you mentioned for gathering metrics. 
> Should I see
> useful output in the ldmd.log file from running those?

Accumulating metrics will allow you to monitor the system using gnuplot(1). See 
<https://www.unidata.ucar.edu/software/ldm/ldm-current/basics/monitoring.html#metrics>
 for more information.

> bin/ldmadmin addmetrics
> bin/ldmadmin newmetrics
> 
> When I just tried running them manually and looking in the ldmd.log the Z820 
> shows
> nothing new.

The metrics go into a separate file in the "var/logs" subdirectory.

> When I run those in the Z400 the addmetrics line the log shows two
> lines

> NOTE  No such file or directory
> NOTE  The upstream LDM database doesn't exist. Is the LDM running?
> 
> The LDM is running on the box when I get that message.

Now that is odd. If you execute the command "uldbutil" does it output anything?

Regards,
Steve Emmerson

Ticket Details
===================
Ticket ID: ZLV-851048
Department: Support NOAAPORT
Priority: Normal
Status: Closed
===================
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