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On Wednesday 26 September 2001 05:10 pm, Kjetil Torgrim Homme wrote:
> Won't the load balancer roughly round-robin each packet to the real
> servers? (I don't know what the implications of 5 second UDP timeout
> are.)
>
> In conclusion, I'd ask the GFS developers about your setup. They
> should know more about the protocol implications of LVS.
It handled UDP the same way Linux NAT handles UDP. When the first packet it
seen from client:port to server:port, it calls that a connection. In the
case of NAT, that is so the reply to the packet is properly forwarded.
Anyhow, this is now setup as a "connection" - and like a TCP connection any
further packets from client:port to server:port are sent to the same server.
And like TCP connections, there is a timeout between when the last packet is
seen, and when the connection is dropped from the table. This is normally
several minutes. I dropped this down do 5 seconds to allow the load balancer
the ability to do it's job. But apparently this is causint a problem. I
upped it to 15 seconds and the write problem went away.
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