topic http-comp rate Denied in Application Networking

http-comp rate Denied

ian.richards — Fri, 25 Jun 2010 07:59:17 GMT

Hi,

I have an ACE4710 with a 100Mbps compression license. I have configured compression which seems to be working, but I have noticed, using sh resource usage all, that we have a high number of denied http-comp rate denied. What I would like to know is if this number is peak in time or accumulated over time.

Our resource usage is

Resource Current Peak Min Max Denied
-------------------------------------------------------------------------------
http-comp rate 0 13107200 0 13107200 81982748

so looking at these stats, it would imply a 725Mbps if it is point in time, or do i have to workout based on the duration?

Thanks for your help

Re: http-comp rate Denied

Sean Merrow — Tue, 29 Jun 2010 13:25:20 GMT

Hello Ian,

The denied number is cumulative, not a peak. It will just keep going up as you continue to peak at the maximum value.

Hope this helps,

Sean

Re: http-comp rate Denied

ian.richards — Tue, 29 Jun 2010 13:30:25 GMT

Thanks Sean,

It there anyway of knowing the peak potential usage, as I understand the lics are available at 500M and 1G how can i tell which one I need?

Cheers

Ian

Re: http-comp rate Denied

Sean Merrow — Tue, 29 Jun 2010 13:46:40 GMT

Ian,

Actually I not aware of any tips on calculating it. However, I would think that if you are running at peak, and monitor how many bytes of denies go up over a period of time, then you could calculate the bytes per second that are being denied. The numbers you see are in bytes so you would need to multiply by 8 to get bits per second.

Current Max: 13107200

Current Max Throughput: 13107200 * 8 = 104857600 = 100 Mbps

Sean

Re: http-comp rate Denied

ian.richards — Tue, 29 Jun 2010 14:04:10 GMT

Hi Sean,

Thanks - I was afraid of having to do that.

Regards

Ian Richards

Computacenter (UK) Ltd

Services & Solutions

Ground Floor

Centric Building

19 Capital Drive

Linford Wood

Milton Keynes

MK14 6GE

T: 07764 16775

E: IAN.RICHARDS@COMPUTACENTER.COM

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Re: http-comp rate Denied

ian.richards — Tue, 29 Jun 2010 14:16:10 GMT

Sean,

Another thought. If the stat is cumulative, it will add to it once it is over the current license (100Mbps) when it drops back down it won't add? So if the traffic is peaky, it will drop below 100Mbps and stop adding to the stat, so is calculating over time valid?

Regards

Ian Richards

Computacenter (UK) Ltd

Services & Solutions

Ground Floor

Centric Building

19 Capital Drive

Linford Wood

Milton Keynes

MK14 6GE

T: 07764 16775

E: IAN.RICHARDS@COMPUTACENTER.COM

W: WWW.COMPUTACENTER.COM

Re: http-comp rate Denied

Sean Merrow — Tue, 29 Jun 2010 14:44:20 GMT

Ian,

Correct. When the comp throughput drops below the max, then the denies will not go up. I would think that you could still use a time period for measuring. If it is generally on the edge of peak, then I would think that going from 100 Mbps to 500 Mbps should do it.

I'm not aware of any easier way.

Sean

Re: http-comp rate Denied

ian.richards — Tue, 29 Jun 2010 15:34:11 GMT

Thanks Sean,

I'll see what I come up with. It does look like 500Mbps will do the trick based on tests we have done todate

Regards

Ian Richards

Computacenter (UK) Ltd

Services & Solutions

Ground Floor

Centric Building

19 Capital Drive

Linford Wood

Milton Keynes

MK14 6GE

T: 07764 16775

E: IAN.RICHARDS@COMPUTACENTER.COM

W: WWW.COMPUTACENTER.COM