Re: [ldm-users] question about primary and secondary data transfer

Hi Greg,

It will also try to pick the fastest site. If both are pretty much equal, if I 
recall correctly, it will flip back-and-forth between those two machines. 
Hopefully somebody can correct me here if I’m wrong.

Gilbert

> On Jan 12, 2018, at 10:43 PM, Karen Cooper - NOAA Affiliate 
> <karen.cooper@xxxxxxxx> wrote:
> 
> Hi Greg,
> 
> I have a feeling it's trying to get data from both sources and trying to 
> balance between them. 
> 
> It would be nice if you could select a preferred source and a secondary 
> source that you only go to if your preferred source goes down for a specified 
> amount of time.  
> 
>> On Fri, Jan 12, 2018 at 1:43 PM, Greg Trotter <gtrotter@xxxxxxxxxx> wrote:
>> I have an LDM server that is connected to two upstreams – one is my NOAAPORT 
>> ingester on my local network, and one is a backup site at a remote location. 
>> I have both listed in my ldmd.conf, with the local server listed first, and 
>> the request patterns are identical.
>> 
>>  
>> 
>> Looking at the queue, it looks like all is well – the origin on all the 
>> products is from our local NOAAPORT ingest server. If I look at the network 
>> traffic on that server, however, I see a lot of data coming in from the 
>> remote server – almost as much as we are bringing in from the local server. 
>> I theorize that the downstream doesn’t see it locally, and requests it from 
>> the remote upstream, but by the time it arrives, it’s come in from the local 
>> upstream? I can’t find any other reason that we’d be having that much 
>> traffic from an upstream LDM that never appears as an origin for the 
>> products in our queue.
>> 
>>  
>> 
>> Is there something I am doing wrong? Clearly, I’d prefer not to use that 
>> much bandwidth if we don’t have to. Is there a way to have it only hit the 
>> remote upstream if the local is unavailable?
>> 
>>  
>> 
>> Here’s the relevant part of my ldmd.conf:
>> 
>>  
>> 
>>  
>> 
>> REQUEST ANY     ".*"    <IP of local noaaport ingester>
>> 
>> REQUEST ANY     ".*"    <IP of remote noaaport ingester>
>> 
>>  
>> 
>> Greg Trotter
>> 
>> System Administrator
>> 
>> Weather Decision Technologies, Inc
>> 
>> 201 David L Boren Blvd Suite 270
>> 
>> Norman, Oklahoma 73072
>> 
>>  
>> 
>> 
>> _______________________________________________
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> 
> 
> 
> -- 
> “The presence of those seeking the truth is infinitely to be preferred to the 
> presence of those who think they’ve found it."
>  -- Terry Prachett
> 
> -------------------------------------------
> Karen.Cooper@xxxxxxxx
> 
> Phone#:  405-325-6456
> Cell:   405-834-8559
> National Severe Storms Laboratory
> 
> _______________________________________________
> NOTE: All exchanges posted to Unidata maintained email lists are
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