sFlow

Telemetry, analytics, and control with sFlow® standard

Saturday, February 23, 2013

SDN and large flows

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Figure 1 Long vs Short flows (from The Nature of Datacenter Traffic: Measurements & Analysis ) Load balancing LAG/ECMP groups  prop...
Friday, February 22, 2013

Configuring Quanta switches

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Configuring sFlow on a Quanta switch can be accomplished through the web interface (shown above), or through the command line interface. ...
Tuesday, February 5, 2013

Measurement delay, counters vs. packet samples

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This chart compares the frame rate reported for a switch port based on sFlow interface counter and packet sample measurements (shown in ...
Monday, February 4, 2013

Cluster performance metrics

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The diagram shows three clusters of servers in a data center (e.g. web , Memcache , Hadoop , or  application cluster). Each cluster may c...
Sunday, February 3, 2013

Delay vs utilization for adaptive control

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Google AppEngine The Google App Engine Blog describes an interesting performance related outage that occurred on Friday, October 26, 20...
Thursday, January 31, 2013

Down the rabbit hole

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The article, Tunnels , describes the use of tunneling protocols such as GRE, NVGRE and VXLAN to create virtual networks in cloud environme...
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Monday, January 21, 2013

Memcache hot keys and cluster load balancing

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Figure 1: Link saturation due to hot Memcache key (from Etsy Code as Craft blog )  The article, mctop – a tool for analyzing memcach...
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