[j-nsp] Qfabric

[Jensen Tyler]

This test was over our Private Fiber WAN. Data center was a 150-200 miles from Hospital. The gear we were using has less than 4us per hop.

Was also able to replicate this in the lab using the linux network emulation software.

The end user in this example is a doctor waiting to look at an x-ray. Performance is perception.


From: Chris Evans [mailto:chrisccnpspam2 at gmail.com]
Sent: Thursday, February 24, 2011 1:11 PM
To: Jensen Tyler
Cc: Juniper-Nsp List; Doug Hanks; Jeff Cadwallader
Subject: Re: [j-nsp] Qfabric


I don't know what hardware you are using but even our older gear isn't much higher than 20micros per hop..  within the DC even old gear is fine for smb..
On Feb 24, 2011 1:11 PM, "Jensen Tyler" <JTyler at fiberutilities.com<mailto:JTyler at fiberutilities.com>> wrote:
> In my tests I have seen as much as a 30% drop in Windows file sharing performance with 2 ms of latency vs <1ms. This was in a large radiology application. Applications like FTP work without any issues. Some applications are more sensitive(SMB). Low latency to me is measure in microseconds not milliseconds(mostly layer 2).
>
> -----Original Message-----
> From: juniper-nsp-bounces at puck.nether.net<mailto:juniper-nsp-bounces at puck.nether.net> [mailto:juniper-nsp-bounces at puck.nether.net<mailto:juniper-nsp-bounces at puck.nether.net>] On Behalf Of Jeff Cadwallader
> Sent: Thursday, February 24, 2011 11:31 AM
> To: Doug Hanks
> Cc: Juniper-Nsp List
> Subject: Re: [j-nsp] Qfabric
>
> I deal with a lot of those issues also and usually when I ask what do they
> mean by low latency the response comes back with sub-25ms. My data center is
> all 1-2ms max on an aging platform.
>
> The other question I have is what happens to that entire logical device when
> it fails in spectacular ways.
>
> I also agree that a sub-ms approach is needed in certain areas, however a
> tiered approach has its advantages also.
>
> We are looking and evaluating replacing our aging platform in the data
> center and will be following this closely.
>
> Jeff Cadwallader
>
> On Thu, Feb 24, 2011 at 11:15 AM, Doug Hanks <dhanks at juniper.net<mailto:dhanks at juniper.net>> wrote:
>
>> A lot of our customers require low latency: financial, higher education,
>> HPC environments and utility.
>>
>> Juniper has taken the time to solve more than just the low latency problem.
>> We're trying to solve larger problems such as how do you manage an entire
>> campus or data center as one logical device; that's able to scale; and
>> delivers performance and low latency.
>>
>> Doug
>>
>>
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