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    Multicast very slow

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    • P
      plegrand
      last edited by plegrand

      For information i’ve got these kinds of logs :
      http://plegrand1.free.fr/multicast.log.udpcast.6

      unicast works fine

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      • george1421G
        george1421 Moderator
        last edited by

        Well the first thing I see here is that your clients are on 100MB links. So that will limit your transfer rates to 12MB/s maximum (all traffic).

        Once the network settles down you are getting 25MB/s transfer rate is very good. Also the slowest computer in the multicast will be the maximum speed of your multicast.

        So I would ask you in your network design. What is the average unicast transfer rate when you image one computer (direct download not multicast)? Then send a multicast image to that same 1 computer. Is there a large difference?

        Please help us build the FOG community with everyone involved. It's not just about coding - way more we need people to test things, update documentation and most importantly work on uniting the community of people enjoying and working on FOG!

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        • P
          plegrand @george1421
          last edited by

          @george1421
          unicast : 30minutes for 14 Computers
          multicast : 24hours for the same computers

          george1421G 1 Reply Last reply Reply Quote 0
          • george1421G
            george1421 Moderator @plegrand
            last edited by

            @plegrand said in Multicast very slow:

            @george1421
            unicast : 30minutes for 14 Computers
            multicast : 24hours for the same computers

            Sorry I was not clear in my request. I only want information on 1 computer (the same computer) One test via unicast and the second test via multicast. I want to compare the speeds between unicast and multicast on the same computer.

            To me you have too many variables in your environment. We need to understand the basics first.

            Please help us build the FOG community with everyone involved. It's not just about coding - way more we need people to test things, update documentation and most importantly work on uniting the community of people enjoying and working on FOG!

            P 2 Replies Last reply Reply Quote 0
            • P
              plegrand @george1421
              last edited by

              @george1421 How can i make multicast on 1 computer? I can’t see this option

              george1421G 1 Reply Last reply Reply Quote 0
              • george1421G
                george1421 Moderator @plegrand
                last edited by

                @plegrand

                mcast_client_count.png

                Then pxe boot the client and select the session name.

                Please help us build the FOG community with everyone involved. It's not just about coding - way more we need people to test things, update documentation and most importantly work on uniting the community of people enjoying and working on FOG!

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                • P
                  plegrand @george1421
                  last edited by

                  @george1421 Sorry but where is this “Start Multicast session” ?

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                  • P
                    plegrand @george1421
                    last edited by

                    @george1421
                    Image menu
                    Multicast Image
                    Start Multicast Session

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                    • P
                      plegrand @george1421
                      last edited by

                      @george1421

                      With only one computer it seams to works fine.

                      Unicast
                      c2b1320f-c025-478f-bcc5-d25eb8678311-image.png file:///home/pascal/Bureau/unicast.jpg

                      Multicast
                      b1e83cb1-140c-4d9e-b26a-9700b65acd8d-image.png file:///home/pascal/Bureau/multicast.jpg

                      george1421G 1 Reply Last reply Reply Quote 0
                      • george1421G
                        george1421 Moderator @plegrand
                        last edited by

                        @plegrand OK very good. This tells us that your network between the fog server and the target computer is good. You are getting ~28MB/s transfer rate. That’s a bit of a lie because your 100MB/s network can only transfer 12MB/s. The 20MB/s is the rate at which partclone can expand the image onto the disk of the target computer. But if you can’t feed partclone fast enough that rate will drop off quickly. If you are getting an expansion rate of the image faster than the network speeds your network rate is good.

                        Now can you make the same test with a computer located on the switch far away from the FOG server. In your drawing it would be the switch I want to test on the left of the drawing. This test will be the full network path between the fog server and the target PC.

                        One question I didn’t ask, how many target computers are in your multicast session?

                        Please help us build the FOG community with everyone involved. It's not just about coding - way more we need people to test things, update documentation and most importantly work on uniting the community of people enjoying and working on FOG!

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                        • P
                          plegrand @george1421
                          last edited by plegrand

                          @george1421
                          To answer to your last question it was a session with 15 target computer and theses target computer was very near the fog server, on my drawing it’s the swith just below the fog server

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                          • george1421G
                            george1421 Moderator @plegrand
                            last edited by

                            @plegrand Well that makes me think a little differently if they are that near to your fog server.

                            Ok lets do a new test for multicast. Lets test 2 computers and then 3 computers. Now these computers must be the same model as the one done in your first test. We need to remove the variable of different models in this test.

                            What I expect to see for 2 computers is about the same speed as 1 computer in the multicast. For 3 computers slightly less than 2 computers. In my mind I question at what point do we go from an acceptable level of speed to bad.

                            I can tell you with unicasting on a pure 1GbE network you can fill up a 1GbE link with 3 simultaneous unicast deployments of FOG with modern target computers. That is a concern for the link to the fog server and switch to switch links mainly. Under a multicast you should get just slightly less than unicast speeds.

                            Please help us build the FOG community with everyone involved. It's not just about coding - way more we need people to test things, update documentation and most importantly work on uniting the community of people enjoying and working on FOG!

                            P 3 Replies Last reply Reply Quote 0
                            • george1421G
                              george1421 Moderator @plegrand
                              last edited by

                              @plegrand Also I just looked into these switching thinking they were old. They are not (at least performance wise) they are better capacity than Cisco small business switch SG300.

                              So I have to ask you why are you running 100MB/s to the desktops?

                              Do you have the capabilities to run a second network wire from the switch where the fog server is to the switch where the target computers are? (I’ll explain more if you can).

                              Please help us build the FOG community with everyone involved. It's not just about coding - way more we need people to test things, update documentation and most importantly work on uniting the community of people enjoying and working on FOG!

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                              • P
                                plegrand @george1421
                                last edited by

                                @george1421
                                With a target computer far from the fog server it seems to works also

                                fddf7741-d626-4eb7-abe3-3625249a467c-image.png file:///home/pascal/Bureau/multicast-205.jpg

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                                • P
                                  plegrand @george1421
                                  last edited by

                                  @george1421
                                  I’m not sure to well understand
                                  Actually my diagram is not “really” true.
                                  The fog server is on a GB port
                                  All desktop clients are on 100 M ports
                                  I cant do anything else, no enough GB ports

                                  george1421G 1 Reply Last reply Reply Quote 0
                                  • P
                                    plegrand @george1421
                                    last edited by

                                    @george1421 For these tests for the moment i’ve no time enough but i’ll do these tests in a near futur

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                                    • P
                                      plegrand @george1421
                                      last edited by plegrand

                                      @george1421 said in Multicast very slow:

                                      Do you have the capabilities to run a second network wire from the switch where the fog server is to the switch where the target computers are? (I’ll explain more if you can).

                                      It’s quiet already the case
                                      The switch (OS6250) where are connected all my target computers is just below the switch where the fog server is (OS6450).
                                      And directly connected by a 1GB link
                                      Then, only target computers are on a 100MB link

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                                      • george1421G
                                        george1421 Moderator @plegrand
                                        last edited by

                                        @plegrand said in Multicast very slow:

                                        I cant do anything else, no enough GB ports

                                        When I looked up the switch configuration it said that all ports are 10/100/1000 rated. Maybe I did not understand.

                                        The the OS6250 switch is only 100Mb/s then I understand why you have 100MB/s to the desktop.

                                        OK on delaying the test. There is a bottleneck someplace we just need to find it.

                                        Please help us build the FOG community with everyone involved. It's not just about coding - way more we need people to test things, update documentation and most importantly work on uniting the community of people enjoying and working on FOG!

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                                        • P
                                          plegrand @george1421
                                          last edited by plegrand

                                          @george1421
                                          The 6450 has all his ports 10/100/1000
                                          not the 6250 only the uplink ports are on 1000

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                                          • P
                                            plegrand @george1421
                                            last edited by plegrand

                                            @george1421 said in Multicast very slow:

                                            Under a multicast you should get just slightly less than unicast speeds.

                                            So what’s the multicast interest if it’s not faster, apart from not flooding the network?

                                            I’m going to make some tests this morning with 2, 3, 4 target computers.
                                            I will tell you the result

                                            george1421G 1 Reply Last reply Reply Quote 0
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