Hi Karen, > Brief background -- We use ldm to pass data between machines here at > NSSL for algorithm processing. For example we get radar data, perform > QC on it and pass it to another machine via LDM where it gets further > processed. Now, the developers want to do comparisons between different > QC techniques, and send them on downstream for further processing. > Unfortunately sometimes the different QC methods produce identical > results, and one or the other product (which have different feedtypes > and paths for downstream differentiation) doesn't get put into the queue > because the MD5 checksum is the same. > > I realize there is no way to put duplicate files in the queue (I've > searched the ldm support threads at Unidata and I can see that), but I'm > wondering if I can use multiple queues and put the different methods > product into separate queues. I could swear I've seen reference to > using multiple queues, but I can't seem to find anything now with all my > searching, and I'm not sure just how to set it up. > > I've also asked the developers if they can just put a flag or small mod > in the file so that it won't be duplicated, but I'm not sure if they > will bite if there is another way to do this. It's possible to run multiple LDM-s on the same host. See <http://www.unidata.ucar.edu/software/ldm/ldm-current/basics/multiple_ldms.html>. Step 4 in the above-mentioned web page is incomplete. It should, instead, say 4. Decide on one of the following approaches for allowing connections from downstream sites: A. Decide on a distinct IP address to use. This necessitates the use of a distinct network interface, which could be a real one (implemented in hardware) or a virtual one (implemented in software). When configuring the ldmadmin(1) configuration-file, etc/ldmadmin-pl.conf, use the $ip_addr variable to specify that IP address. B. Select a distinct port on which the LDM server will listen. Use the "--enable-port=port" option of the configure script to configure the LDM to use that port. On the downstream hosts, do one of the following: 1. Use the optional ":port" field in REQUEST entries to specify to which port to connect. 2. Configure the downstream LDM to use the same port via the same "--enable-port=port" option of the configure script. Good luck. > ------------------------------------------- > > There are 2 kinds of people in the world: > > 1) Those who can extrapolate from incomplete data. > > ------------------------------------------- > address@hidden > > Phone: 405-325-6982 > Cell: 405-834-8559 > SAIC/Systems Analyst > National Severe Storms Laboratory Regards, Steve Emmerson Ticket Details =================== Ticket ID: XYU-166657 Department: Support LDM Priority: Normal Status: Closed
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