[ENBD] 20G dd hang up!

[Kuniyasu SUZAKI]

Dear,

Insted of my colleague Mr. Watanabe, I reply this message.

 >>He's in trouble already here.  The TEST must succeed.  There is no point
 >>in proceding until the test can be run.  Maybe he means that he
 >>succeeded with a lolcalhost to localhost test, and then attempted local
 >>to remote but didn't get anywahere.
 >>
 >>If that is the case he needs to make it clear and investigate.

Yes. The situation was caused by host machine.  It seemed that the
write request by "dd" seemed too heavy.  the client machine became
overload and it hung up. 
Do we need to control the write request with timeout option (-t) or
something?

 >>> What network cards are you using? I have had a whole load of similar
 >>> problems with netgear fa311a cards which I've now pulled out of every
 >>> machine I have - almost anything seems to be better than those cards
 >>> which just drop packets.
 >>
 >>Interesting. But it should be covered up by tcp, surely?

We used 100M Ether NIC(3Com 3c905C Tornado). The performance measured
by "netperf" was approximately 95 Mbps. It was nice but it was still
narrow for "dd" write request.

  Kuniyasu SUZAKI, National Institute of Advanced Industrial Science and Technology,
  Tsukuba Central 2, Umezono 1-1-1, Tsukuba, Ibaraki 305-8568, JAPAN
  Project NTC (Network Transferable Computer) http://www.etl.go.jp/~suzaki/English/NTC