[LDM #XQC-361661]: LDM Question

Hi Bob,

> I spoke too soon, see the output of one of the cron jobs below. Not sure if
> I should worry about it, or if you had any other suggestions.
> 
> I decided to run the "ldmadmin check" command without sending the output to
> /dev/null, here's the output:
> 
> (ldm.ipa.unca.edu /ldm-home > ldmadmin check
> Checking for a running LDM system...
> Checking the system clock...
> Checking the most-recent insertion into the queue...
> Vetting the size of the queue against the maximum acceptable latency...
>
> vetQueueSize(): The maximum acceptable latency (registry parameter
> "/server/max-latency": 3600 seconds) is greater than the observed
> minimum virtual residence time of data-products in the queue (8 seconds).
> This will hinder detection of duplicate data-products.
> The value of the "/reconciliation-mode" registry-parameter is "do nothing"
> vetQueueSize(): The queue should be 199424005200 bytes in size with
> 735300 slots or the maximum-latency parameter should be decreased to
> 8 seconds. You should set registry-parameter "/reconciliation-mode" to
> "increase queue" or "decrease maximum latency" or manually adjust the
> relevant registry parameters and recreate the queue.

The above indicates that your product-queue is way too small for the amount of 
data you're receiving and the value of the "/server/max-latency" parameter in 
the LDM registry. A larger queue or a smaller max-latency parameter is 
necessary for detecting and rejecting duplicate data-products.

It's unlikely, however, that you need a 200 GB queue. What feeds are you 
requesting and what is the output of the command "regutil | grep queue"?

> I didn't see the errors from chronyd but there are some other diagnostics
> that I'm not sure what to do with.
> 
> Suggestions?
> 
> Now we just have to figure-out how to integrate this into the next release.
> >
> > Be advised that your next installation won't work unless we do.
> >
> 
> I understand. One of our professors, XXX XXXX did the install of the
> LDM software so he may wish to weigh in regarding the above
> recommendations.  Would it make more sense to simply install a new version
> and move the modifications you suggested to the new installation path?

Not yet. Let's get the queue size fixed first.

Regards,
Steve Emmerson

Ticket Details
===================
Ticket ID: XQC-361661
Department: Support LDM
Priority: Normal
Status: Closed
===================
NOTE: All email exchanges with Unidata User Support are recorded in the Unidata 
inquiry tracking system and then made publicly available through the web.  If 
you do not want to have your interactions made available in this way, you must 
let us know in each email you send to us.