Precise per GB traffic calculations.
Does anyone know of a solution that offers precise methods of tracking bandwidth utilizations at the per Megabyte or Gigabyte level and not at the rate of transfer level? Some people are asking me if we can bill them in this manner, and I'm questioning whether the stats that the switch are giving us are that accurate. Hit me off-list. Thanks, -Drew
DW> Date: Fri, 20 Aug 2004 17:06:42 -0400 DW> From: Drew Weaver DW> Does anyone know of a solution that offers precise methods of DW> tracking bandwidth utilizations at the per Megabyte or DW> Gigabyte level and not at the rate of transfer level? Rate of transfer is determined using byte counters. Eddy -- EverQuick Internet - http://www.everquick.net/ A division of Brotsman & Dreger, Inc. - http://www.brotsman.com/ Bandwidth, consulting, e-commerce, hosting, and network building Phone: +1 785 865 5885 Lawrence and [inter]national Phone: +1 316 794 8922 Wichita _________________________________________________________________ DO NOT send mail to the following addresses: davidc@brics.com -*- jfconmaapaq@intc.net -*- sam@everquick.net Sending mail to spambait addresses is a great way to get blocked.
DW> Does anyone know of a solution that offers precise methods of DW> tracking bandwidth utilizations at the per Megabyte or DW> Gigabyte level and not at the rate of transfer level?
Rate of transfer is determined using byte counters.
[Eddy is saying "yes" in the above line]. I'm not sure that would be clear to me if I didn't already know the answer to the question. Forgive the Friday afternoon curve. DJ
On Aug 20, 2004, at 5:06 PM, Drew Weaver wrote:
Does anyone know of a solution that offers precise methods of tracking bandwidth utilizations at the per Megabyte or Gigabyte level and not at the rate of transfer level?
Some people are asking me if we can bill them in this manner, and I'm questioning whether the stats that the switch are giving us are that accurate.
I don't know of any equipment that does NOT measure per-byte transferred. The Mbps is done by taking the bytes transferred (multiply by 8) and divide by the time involved, usually 5 minute periods. -- TTFN, patrick
On Fri, 20 Aug 2004, Patrick W Gilmore wrote: : On Aug 20, 2004, at 5:06 PM, Drew Weaver wrote: : : > ����������� Does anyone know of a solution that offers precise methods : > of tracking bandwidth utilizations at the per Megabyte or Gigabyte : > level and not at the rate of transfer level? : : I don't know of any equipment that does NOT measure per-byte : transferred. The Mbps is done by taking the bytes transferred : (multiply by 8) and divide by the time involved, usually 5 minute : periods. I just want to point out that this is not a strict average over 5 minutes in the case of cisco's output for the "show interface" bits per second. It's an exponentially weighted average: http://cisco.com/en/US/products/sw/iosswrel/ps1818/products_tech_note09186a0... Bits per second include all packet/frame overhead. It does not include stuffed zeros. The size of each frame is added to the total bytes of output. The rate is calculated by taking the difference every 5 seconds. The algorithm for the five-minute moving average is: new average = ((average - interval) * exp (-t/C)) + interval where: - t is five seconds and C is 5 minutes. exp(-5/(60*5)) == .983 - newaverage = the value we are trying to compute - average = the "newaverage" value calculated from the previous sample - interval = the value of the current sample - (.983) is the weighting factor What you are basically doing is taking the average from the last sample less what we gathered in this sample and weighting that down by a decay factor. This quantity can be referred to as an "historical average". To the weighted (decayed) historical average, we add our current sample and come up with a new weighted (decayed) average. scott
On Fri, 20 Aug 2004, Drew Weaver wrote:
Does anyone know of a solution that offers precise methods of tracking bandwidth utilizations at the per Megabyte or Gigabyte level and not at the rate of transfer level?
I've used a tool called "IOG", which works to some extent, but it looks like it has problems with 64bit counters.
Some people are asking me if we can bill them in this manner, and I'm questioning whether the stats that the switch are giving us are that accurate.
Imagine this scenario: Customer Buys 600GB of "transfer" Customers transfers 600GB @ 100Mbps for however many hours. If you're being billed with 95th percentile, and your customer is being billed on transfer, guess who gets the short end of the stick...
On Fri, 20 Aug 2004, Drew Weaver wrote:
Does anyone know of a solution that offers precise methods of tracking bandwidth utilizations at the per Megabyte or Gigabyte level and not at the rate of transfer level?
Some people are asking me if we can bill them in this manner, and I'm questioning whether the stats that the switch are giving us are that accurate.
simple but should work, do this with mrtg, set the data type to 'absolute' and zero it at the start of each month, it will give you the total in a month.
On Fri, 20 Aug 2004, Drew Weaver wrote:
Does anyone know of a solution that offers precise methods of tracking bandwidth utilizations at the per Megabyte or Gigabyte level and not at the rate of transfer level?
Some people are asking me if we can bill them in this manner, and I'm questioning whether the stats that the switch are giving us are that accurate.
Drew, Your counters probably reset a couple of times during the month, when they reach some maximum value. Or perhaps because somebody power cycles the switch. So, no, it's not a good idea to look at the counter on day 1 and on day 30 and compare them. Check it every 5 minutes and store it in a database. That way, the same system can do aggregate or 95th percentile, it's all in the report script you write. Andy --- Andy Dills Xecunet, Inc. www.xecu.net 301-682-9972 ---
participants (8)
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Andy Dills -
Deepak Jain -
Drew Weaver -
Edward B. Dreger -
Patrick W Gilmore -
Scott Weeks -
Stephen J. Wilcox -
Tom (UnitedLayer)