topic Re: Flow control: What are your real world experiences? in Array Performance and Data Protection https://community.hpe.com/t5/array-performance-and-data/flow-control-what-are-your-real-world-experiences/m-p/6985331#M861 <HTML><HEAD></HEAD><BODY><P>Hi Dan,</P><P>I've seen issues in a SmartStack when flow control hasn't been enabled. During high performance load and a manual controller failover, we observed 2 things:</P><P>1) the time for activity to resume after the failover took longer than with flow control enabled</P><P>2) 'choppy' performance (peaks and troughs in monitor&gt;performance charts for IOPS) on the Nimble rather than consistent performance </P></BODY></HTML> Tue, 30 Jun 2015 09:12:23 GMT amirul93 2015-06-30T09:12:23Z Flow control: What are your real world experiences? https://community.hpe.com/t5/array-performance-and-data/flow-control-what-are-your-real-world-experiences/m-p/6985330#M860 <HTML><HEAD></HEAD><BODY><P>We have an internal discussion going that revolves around flow control.</P><P>Arguments for enabling it:</P><P>-Most every storage vendor recommends enabling it.</P><P>-It can be more efficient at managing traffic than TCP dropping and re-sending packets.</P><P></P><P>Arguments against enabling it:</P><P>-TCP was designed to handle its own flows.</P><P>-Pause frames from a host unable to handle traffic can negatively impact other hosts currently not having issues.</P><P></P><P></P><P>Anyone have any real world experiences where flow control either improved or hindered performance?</P><P>Any other insight?</P></BODY></HTML> Thu, 04 Jun 2015 16:21:27 GMT https://community.hpe.com/t5/array-performance-and-data/flow-control-what-are-your-real-world-experiences/m-p/6985330#M860 foodandbikes 2015-06-04T16:21:27Z Re: Flow control: What are your real world experiences? https://community.hpe.com/t5/array-performance-and-data/flow-control-what-are-your-real-world-experiences/m-p/6985331#M861 <HTML><HEAD></HEAD><BODY><P>Hi Dan,</P><P>I've seen issues in a SmartStack when flow control hasn't been enabled. During high performance load and a manual controller failover, we observed 2 things:</P><P>1) the time for activity to resume after the failover took longer than with flow control enabled</P><P>2) 'choppy' performance (peaks and troughs in monitor&gt;performance charts for IOPS) on the Nimble rather than consistent performance </P></BODY></HTML> Tue, 30 Jun 2015 09:12:23 GMT https://community.hpe.com/t5/array-performance-and-data/flow-control-what-are-your-real-world-experiences/m-p/6985331#M861 amirul93 2015-06-30T09:12:23Z