Hi Karen (long time no hear :-) > Sorry if this has been asked before, I searched the archives and > couldn't find anything. We are using LDM-6.4.1 to ship some of our > products around between machines (using EXP feedtype). The data all > seems to be getting through, but the connections keep "flipping" between > primary and alternate modes. I know the primary mode is more > efficient, but I'm not sure why it is flipping back and forth. Every minute, a downstream LDM re-evaluates its reception mode (PRIMARY or ALTERNATE) and switches if it should, depending on the rate of successful insertions into the product-queue. If it's in PRIMARY mode, then it will switch to ALTERNATE mode if it's not responsible for most of the insertions and vice versa. > Does this indicate a delay in the data? More than anything else, it indicates that the multiple upstream LDM-s from which you're getting data are at electronically similar distances from the receiving LDM. > And, is there any way to force the > connections to always be primary mode? No, and I don't think you'd want that. It does tend to pollute the log file, however, which is why I usually use grep(1) when perusing the log file. Now, having said all that, I note the following in the CHANGE_LOG file for a more recent version of the LDM than the one you're using: Corrected checking of saved product-information by a downstream LDM if the number of hosts sending the same products is two or more. This should decrease the rate of transfer-mode switching. You might try the latest version of the LDM to see if the switching-rate is less. I recommend the beta version ftp://ftp.unidata.ucar.edu/pub/ldm/beta/ldm-220.127.116.11.tar.Z > Beware programmers who carry screwdrivers. Hey! I got a screwdriver -- and I'm not afraid to use it! :-) Regards, Steve Emmerson Ticket Details =================== Ticket ID: AET-785898 Department: Support LDM Priority: Normal Status: Closed
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