We have multiple Front End box and Back End box.

When I scp a file from FE1 to BE box it's slower then rest of the FE boxes. Network engineer looked at it and couldn't find any problems with NIC, switch, routes, Cards, configuration etc. How do I track this problem down?

A couple of things you could start off with:

* Take a Wireshark trace of a "good transfer", of a "bad transfer", and compare the two
<= In particular, is there any excessive latency from one host or the other between packets?

* Benchmark a non-scp file copy on the "good host" vs the "bad host" (is the problem truly network/scp, or does one host simply have a faster disk or CPU than the other)?

How are things going with your "other problems"?

Have you tried JConsole, jmx-console, or learned anything more about the JBoss performance issues?

Have you tried "kill -15", or run "gdb" to get a stack trace of the "hung" process (conv32.linux, I recall) to troubleshoot the problem?

Inquiring minds want to know

I tried local copy and that seems to be fast. What else can I check? I am not sure what tcpdump will reveal. We al ready know it's slow and all network setting look ok.

Regarding other issue, jmx-console doesn't provide enough information about threads and how it's being scheduled on CPU.