Every transaction-oriented software system has a performance bottleneck that
limits its throughput. Eliminating that bottleneck -- either by improving
the software or upgrading the hardware -- always reveals the next

The ARRL has determined that LotW's throughput is limited by the rate at
which new QSOs can be inserted into the database, and has ordered a new
storage subsystem to eliminate this bottleneck. This step is necessary, but
may or may not be sufficient; we should know in 4-6 weeks.

At present, ~50% of the QSOs uploaded to LotW are duplicates. There are
several practical ways to reduce the load that these duplicates impose on
LotW without imposing onerous requirements on users; at least one of them
will be implemented.

The ARRL is now providing daily LotW status updates and hourly LotW Queue
Length updates, a level of transparency we have  long sought and should
further encourage. Cynical, sarcastic, non-constructive posts
second-guessing the ARRL's course of action are not the best way to
accomplish this.

I am not suggesting that anyone back off on expressing their interest in
seeing LotW restored to reliable service.  The constructive message to send
to ARRL management and representatives is this: 

"I'm glad that ARRL management is finally attending to LotW and hope that
this first step is sufficient; but if it's not, I expect them to waste no
time in taking the follow-on actions required to bring LotW to an acceptable
level of throughput and reliability, keeping the user community abreast of
their efforts".


               Dave, AA6YQ

To unsubscribe or subscribe to this list.  Please send a message to


In the message body put either 

unsubscribe dx-chat


subscribe dx-chat

This is the DX-CHAT reflector sponsored by the NJDXA http://njdxa.org

Reply via email to