18 Replies Latest reply: Nov 12, 2013 4:24 AM by UniversityOfHull RSS

ONTAP 7.2.5.1 Simulator & Slow writes

jvcherney
Currently Being Moderated

Anyone else seeing slow write speeds when using the netapp simulator??

 

I get the expected 100Mbit read speads... but it seems like its crawing along at 10Mbit when writing...

 

This is for NFS writes... Machines are on the same network.

 

Any thought Ideas would be great.

  • Re: ONTAP 7.2.5.1 Simulator & Slow writes
    Currently Being Moderated

    Hi Joseph,

     

    How about the traffic on your LAN ? Did you find any time the packet drops ? You run “netdiag” to confirm no networking issues.

     

    Thanks;

    Daniel

    • Re: ONTAP 7.2.5.1 Simulator & Slow writes
      jvcherney
      Currently Being Moderated

      danielpr wrote:

       

      Hi Joseph,

       

      How about the traffic on your LAN ? Did you find any time the packet drops ? You run “netdiag” to confirm no networking issues.

       

      Thanks;

      Daniel

       

      Sorry, still a no go,

       

      I am working on a separate segregated LAN so there is no other traffic,

       

      There are no packet drops that I am seeing,

       

      The slowdown that I am seeing is only when seen in the simulator.

       

      If I start an NFS server on the machine I can send and receive at full speed, and seeing as this seems to only be affecting write speeds (I can read w/ no problems) I am thinking this may be a purpose buld limit of the simulator.

       

      Results of the netdiag

       

      NetappSIM-1> netdiag
      Performing physical layer diagnostics.....OK
      Performing network layer diagnostics.....OK
      Performing transport layer diagnostics.....OK

      NetappSIM-1>    

       

      Thanks,

       

      Joe

  • Re: ONTAP 7.2.5.1 Simulator & Slow writes
    jvcherney
    Currently Being Moderated

    Ok, I give up.

     

    I've tried everything that I can think on.

     

    3 different network cards, static / dhcp, even went as far as to connect the 2 machines directly via crossover.

     

    and I still get the  same results... Blazing fast NFS transfers from the client to Simulator's Host IP... but dog slow when going to the Simulators IP.

     

    It seems that I am cursed.

  • Re: ONTAP 7.2.5.1 Simulator & Slow writes
    jvcherney
    Currently Being Moderated

    Ok Ok, So I didn't give up... But still having the Problem...

     

    I've set up CIFS, and I still have the same slow 850K's writes...

     

    I've Tried...

     

    PC 2 VM(Sim)

    VM 2 VM(Sim) same v-lan

    VM 2 PC(Sim)

    PC 2 PC(Sim) Direct via Crossover cable

     

    Crux 2.5, CentOS 4 & 5, OULinux 4 & 5, RedHat 9

     

    Broadcom TG3, 2x Intel E1000, 2x Intel E100

     

    Even tried the ONTAP 7.3.1 Simulator w/ the same outcome.

     

    Every install, Every combination results in the same 850KB's write speed.

     

    Is there a setting that I am missing, some secret chant that I need to do???

     

    I cannot believe that nobody out there doesn't see the same thing.

     

    Anyone? Anyone?

     

    Is this thing on?

     

    Give me something Please!

     

    Thank you,

     

    Joe

    • Re: ONTAP 7.2.5.1 Simulator & Slow writes
      Currently Being Moderated

      Joe,

       

      What about the memory size in Linux machine and how much you have shared it for Data ONTAP simulator?

      It doesnt seems to be a network issue since you have tired with back to back also using cross over cable.

       

      Thanks

      Daniel

      • Re: ONTAP 7.2.5.1 Simulator & Slow writes
        jvcherney
        Currently Being Moderated

        For the stand alone systems, there is 1 gig install w/ 512 allocated for the Netapp Simulator (There is no swapping as its the only thing running)

         

        For the VM's, they are set to 2 gig w/ 512 allocated for the Netapp Simulator (Again no swapping as they are the only thing running)

         

        I've also tried disabling HyperThreading in the standalone systems thinking its getting "stuck" in the hyperthreaded core... but that of course didn't help...

         

        If you tell me that there is no network / write throttle then something has to I am doing... although I realy don't know what... the install is as simple as it can get....

         

        Thank any way,

         

        Cheers,

         

        Joe

        • Re: ONTAP 7.2.5.1 Simulator & Slow writes
          jedrzej.lisowski
          Currently Being Moderated

          Hi,

           

          I've got exactly the same problem, about 115MB/s when reading from netapp sim (iscsi, nfs) and 360-500kB/s when writing (iscsi,nfs), netapp simulator version 7.3.2, host os ubuntu 10.04 server, env VirtualBox with Host-only networking.

          • Re: ONTAP 7.2.5.1 Simulator & Slow writes
            jvcherney
            Currently Being Moderated

            I was never able to get it to work right regardless of Real vs VM, or OS combnation, or simulator settings.

             

            If you figure something out, let me know. I have abandoned the use of the simulator for this reason...

             

            It would be nice to have something to test methods against where it dosent take 30 min to copy a simple 1 gig file.

             

            Joe

            • Re: ONTAP 7.2.5.1 Simulator & Slow writes
              dan.keating
              Currently Being Moderated

              If you run sysstat -x 1 on the sim as you're writing data to it - what's happening with the CP types? back to back and deferred back to backs perhaps? (man sysstat for cp type info)

              The simulator has a pitiful simulated nvram (circa 2MB I seem to remember) that get's flooded almost immediately - so it's probably constantly backing of write requests.

               

              I could do with a bit more oomph tbh.

              • Re: ONTAP 7.2.5.1 Simulator & Slow writes
                jvcherney
                Currently Being Moderated

                YOU sir seem to be correct.

                 

                4%    25     0     0      25   861    24   1624   2012     0     0   >60  100% 100%  Bv  90%      0     0     0     0     0     0
                  5%    50     0     0      50  1723    49   2176   2152     0     0   >60  100% 100%  Bf  97%      0     0     0     0     0     0
                  2%    25     0     0      25   861    24   2576   2588     0     0   >60  100% 100%  Bf  94%      0     0     0     0     0     0
                16%    24     0     0      24   818    23   1466   1827     0     0   >60  100% 100%  Bf  93%      0     0     0     0     0     0
                  4%    25     0     0      25   855    24   1772   2014     0     0   >60   99% 100%  Bf  96%      0     0     0     0     0     0
                  2%    25     0     0      25   861    24   1880   2116     0     0   >60  100% 100%  Bf  92%      0     0     0     0     0     0
                  2%    25     0     0      25   861    24   1760   1992     0     0   >60  100% 100%  Bf  93%      0     0     0     0     0     0
                  2%    25     0     0      25   861    24   1768   1904     0     0   >60  100% 100%  Bf  93%      0     0     0     0     0     0
                14%    24     0     0      24   839    24   1786   1918     0     0   >60  100% 100%  Bf  96%      0     0     0     0     0     0
                  4%    50     0     0      50  1716    48   2092   1984     0     0   >60   99% 100%  Bs  91%      0     0     0     0     0     0
                  5%    25     0     0      25   861    24   2308   2412     0     0   >60  100% 100%  Bf  99%      0     0     0     0     0     0
                  2%    25     0     0      25   861    24   1824   2204     0     0   >60  100% 100%  Bf  92%      0     0     0     0     0     0
                  2%    25     0     0      25   861    24   1912   2320     0     0   >60  100% 100%  Bf  96%      0     0     0     0     0     0
                13%    25     0     0      25   861    24   1784   1848     0     0   >60  100% 100%  Bf  98%      0     0     0     0     0     0

                 

                Now.... Any idea how to get around this little hick-up?

                 

                Thank you,

                 

                Joe

  • Re: ONTAP 7.2.5.1 Simulator & Slow writes
    DEADSOUL0
    Currently Being Moderated

    I'm also using netapp 8.1.2 simulator and experiencing very slow write speeds.

     

    Sad because I was attempting to lab some stuff as we use NetApp at work.

  • Re: ONTAP 7.2.5.1 Simulator & Slow writes
    UniversityOfHull
    Currently Being Moderated

    Same issue here on simulator 8.0.5 7-Mode.

     

    Pretty annoying when your testing transferring large file across LUNs

More Like This

  • Retrieving data ...