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  • 1.  Understanding Traffic Shapping in a Standard Switch

    Posted Aug 27, 2012 09:30 PM

    In Traffic there are three settings Average, Peak, Burst, I get that.  I also see that Average/Peak or bits and Burst size bytes.

    So there are two things I am just not getting.  1.  Why is burst size in bytes while the other to are in bits?

    Part two of the question is the default for a 1 Gb link is 100000 for Average and Peak but Burst is 102400.  I read help that said burst was max amount of data in the burst.  It also said is what bandwidth multiplied by time, but that tells me nothing, and how the heck can your burst exceed your peak.

    In my experience bit was network and byte was storage, but 1 plus 1 is not equally two.

    Can someone please dumb this down for me.



  • 2.  RE: Understanding Traffic Shapping in a Standard Switch

    Posted Aug 27, 2012 09:39 PM

    There are 8 bits in one byte.  Seem like it is the lowest unit that the vSwitch can monitor and to keep track.

    One can burst in terms of byte as a unit and the other can burst in terms of bit as a unit.

    I want to know if there are other reasons.



  • 3.  RE: Understanding Traffic Shapping in a Standard Switch
    Best Answer

    Posted Aug 28, 2012 08:47 AM

    hurdle wrote:

    In Traffic there are three settings Average, Peak, Burst, I get that.  I also see that Average/Peak or bits and Burst size bytes.

    So there are two things I am just not getting.  1.  Why is burst size in bytes while the other to are in bits?

    Part two of the question is the default for a 1 Gb link is 100000 for Average and Peak but Burst is 102400.  I read help that said burst was max amount of data in the burst.  It also said is what bandwidth multiplied by time, but that tells me nothing, and how the heck can your burst exceed your peak.

    In my experience bit was network and byte was storage, but 1 plus 1 is not equally two.

    Can someone please dumb this down for me.

    The bandwidth is expressed in bits, as in a certain number of Kilobits allowed as average, the default is 100 Mbit/s if I remember correct.

    If you want, you could allow the VM to temporarily "raise" this limit in a short burst. You should set this higher limit also expresed in bits, e.g. 200 Mbit/s, meaning that the VMs could for some period of time use a higher amount of bandwidht.

    Finally, for how long could a VM use this higher bandwidth? This is not set in seconds, but in the number of Bytes that could be sent. In the case above, 102400 Bytes - which is 100 MByte. This could be changed to something else, perhaps lower, allowing the VM to use a higher bandwidht, but only send 5 MByte of data in a higher speed.



  • 4.  RE: Understanding Traffic Shapping in a Standard Switch

    Posted Aug 28, 2012 04:12 PM

    Thanks!!