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<p class="MsoNormal">I have this on some of my FCX’s<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">They have 10g uplinks (set 2) and 1 g links to servers / Sans (set 1)<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">symmetric-flow-control enable<o:p></o:p></p>
<p class="MsoNormal">symmetric-flow-control set 1 xoff 60 xon 50<o:p></o:p></p>
<p class="MsoNormal">symmetric-flow-control set 2 xoff 60 xon 50<o:p></o:p></p>
<p class="MsoNormal">symmetric-flow-control set 1 buffers 64<o:p></o:p></p>
<p class="MsoNormal">symmetric-flow-control set 2 buffers 1632<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">The iSCSI best practice document says to turn on flow control – but
<u>not </u>to set individual values.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Do you brocade experts see any harm in removing these – I’m not sure how my predecessor came to add these and why these values were chosen – perhaps going from 10g interfaces to 1 g interfaces and or for buffers etc.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Thanks,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">The relevant part of the guide does not mention WHY you would change these values:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal" style="margin-bottom:1.2pt"><b><span style="font-size:20.5pt;font-family:"Arial","sans-serif";color:black">symmetric-flow-control set</span></b><span style="font-size:20.5pt;font-family:"Arial","sans-serif";color:black"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:9.0pt;font-family:"Arial","sans-serif";color:black">Sets symmetric flow control parameters.<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-top:12.0pt"><b><span style="font-size:10.5pt;font-family:"Arial","sans-serif";color:black">Syntax<o:p></o:p></span></b></p>
<p class="MsoNormal"><b><span style="font-size:9.0pt;font-family:"Arial","sans-serif";color:black">symmetric-flow-control set</span></b><span style="font-size:9.0pt;font-family:"Arial","sans-serif";color:black"> <i>port-type</i> { <b>buffers</b> <i>value</i> [ <b>unit</b> <i>unit-value</i> ] | <b>xoff</b> <i>num</i> <b>xon</b> <i>num</i> }<o:p></o:p></span></p>
<p class="MsoNormal"><b><span style="font-size:9.0pt;font-family:"Arial","sans-serif";color:black">no symmetric-flow-control set</span></b><span style="font-size:9.0pt;font-family:"Arial","sans-serif";color:black"> <i>port-type</i> { <b>buffers</b> <i>value</i> [ <b>unit</b> <i>unit-value</i> ] | <b>xoff</b> <i>num</i> <b>xon</b> <i>num</i> }<o:p></o:p></span></p>
<p class="MsoNormal"><b><span style="font-size:10.5pt;font-family:"Arial","sans-serif";color:black">Command Default<o:p></o:p></span></b></p>
<p class="MsoNormal" style="margin-top:12.0pt;mso-margin-bottom-alt:auto"><span style="font-size:9.0pt;font-family:"Arial","sans-serif";color:black">1G: Buffers: 272; XOFF Limit: 91; XON Limit: 75<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-top:12.0pt;mso-margin-bottom-alt:auto"><span style="font-size:9.0pt;font-family:"Arial","sans-serif";color:black">10G: Buffers: 416; XOFF Limit: 91; XON Limit: 75<o:p></o:p></span></p>
<p class="MsoNormal"><b><span style="font-size:10.5pt;font-family:"Arial","sans-serif";color:black">Parameters<o:p></o:p></span></b></p>
<p class="MsoNormal" style="margin-top:5.25pt"><i><span style="font-size:9.0pt;font-family:"Arial","sans-serif";color:black">port-type</span></i><span style="font-size:9.0pt;font-family:"Arial","sans-serif";color:black"><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:9.0pt;font-family:"Arial","sans-serif";color:black">Specifies the port type. The port type can be one of the following:<o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:5.25pt;margin-right:0in;margin-bottom:0in;margin-left:.5in;margin-bottom:.0001pt">
<b><span style="font-size:9.0pt;font-family:"Arial","sans-serif";color:black">1</span></b><span style="font-size:9.0pt;font-family:"Arial","sans-serif";color:black"><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:9.0pt;font-family:"Arial","sans-serif";color:black">Sets the buffer limits or XOFF and XON limits for 1G ports.<o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:5.25pt;margin-right:0in;margin-bottom:0in;margin-left:66.0pt;margin-bottom:.0001pt">
<b><span style="font-size:9.0pt;font-family:"Arial","sans-serif";color:black">2</span></b><span style="font-size:9.0pt;font-family:"Arial","sans-serif";color:black"><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:9.0pt;font-family:"Arial","sans-serif";color:black">Sets the buffer limits or XOFF and XON limits for 10G ports.<o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:5.25pt;margin-right:0in;margin-bottom:0in;margin-left:96.0pt;margin-bottom:.0001pt">
<b><span style="font-size:9.0pt;font-family:"Arial","sans-serif";color:black">3</span></b><span style="font-size:9.0pt;font-family:"Arial","sans-serif";color:black"><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:9.0pt;font-family:"Arial","sans-serif";color:black">Sets the buffer limits or XOFF and XON limits for 100G ports.<o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:5.25pt;margin-right:0in;margin-bottom:0in;margin-left:30.0pt;margin-bottom:.0001pt">
<b><span style="font-size:9.0pt;font-family:"Arial","sans-serif";color:black">buffers</span></b><span style="font-size:9.0pt;font-family:"Arial","sans-serif";color:black"> <i>value</i><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:9.0pt;font-family:"Arial","sans-serif";color:black">Sets the total buffer limits. The value can range from 64 through 320 for 1G ports and from 64 through 1632 for 10G ports. The default value
for 1G ports is 272 and for 10G ports is 416 .<o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:5.25pt;margin-right:0in;margin-bottom:0in;margin-left:60.0pt;margin-bottom:.0001pt">
<b><span style="font-size:9.0pt;font-family:"Arial","sans-serif";color:black">unit</span></b><span style="font-size:9.0pt;font-family:"Arial","sans-serif";color:black"> <i>unit-value</i><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:9.0pt;font-family:"Arial","sans-serif";color:black">Specifies the buffer limit for a stack unit.<o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:5.25pt;margin-right:0in;margin-bottom:0in;margin-left:1.25in;margin-bottom:.0001pt">
<b><span style="font-size:9.0pt;font-family:"Arial","sans-serif";color:black">xoff</span></b><span style="font-size:9.0pt;font-family:"Arial","sans-serif";color:black"> <i>num</i><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:9.0pt;font-family:"Arial","sans-serif";color:black">Sets the XOFF limit. The minimum value is 60 percent, and the maximum value is 95 percent.<o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:5.25pt;margin-right:0in;margin-bottom:0in;margin-left:120.0pt;margin-bottom:.0001pt">
<a name="GUID-6B049C85-09A7-4EF9-AD4A-3AADF462728"></a><b><span style="font-size:9.0pt;font-family:"Arial","sans-serif";color:black">xon</span></b><span style="font-size:9.0pt;font-family:"Arial","sans-serif";color:black"> <i>num</i><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:9.0pt;font-family:"Arial","sans-serif";color:black">Sets the XON limit. The minimum value is 50 percent and the maximum value is 90 percent.<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:139.2pt"><b><span style="font-size:10.5pt;font-family:"Arial","sans-serif";color:black">Modes<o:p></o:p></span></b></p>
<p class="MsoNormal" style="margin-top:12.0pt;mso-margin-bottom-alt:auto;margin-left:150.0pt">
<span style="font-size:9.0pt;font-family:"Arial","sans-serif";color:black">Global configuration mode<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:139.2pt"><b><span style="font-size:10.5pt;font-family:"Arial","sans-serif";color:black">Usage Guidelines<o:p></o:p></span></b></p>
<p class="MsoNormal" style="margin-top:12.0pt;mso-margin-bottom-alt:auto;margin-left:150.0pt">
<span style="font-size:9.0pt;font-family:"Arial","sans-serif";color:black">Use the <b>show symmetric</b> command to view the default or configured buffer limit or XON and XOFF thresholds.<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-top:12.0pt;mso-margin-bottom-alt:auto;margin-left:150.0pt">
<span style="font-size:9.0pt;font-family:"Arial","sans-serif";color:black">The <b>no</b> form of the command deletes the configured symmetric flow control values.<o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:12.0pt;margin-right:0in;margin-bottom:0in;margin-left:139.2pt;margin-bottom:.0001pt">
<b><span style="font-size:10.5pt;font-family:"Arial","sans-serif";color:black">Examples<o:p></o:p></span></b></p>
<p class="MsoNormal" style="mso-margin-bottom-alt:auto;margin-left:150.0pt"><span style="font-size:9.0pt;font-family:"Arial","sans-serif";color:black">The following example changes the thresholds for all 1G ports.<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:150.0pt"><span style="font-size:9.0pt;font-family:Courier;color:black">device(config)# symmetric-flow-control set 1 xoff 91 xon 75<o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-bottom-alt:auto;margin-left:150.0pt"><span style="font-size:9.0pt;font-family:"Arial","sans-serif";color:black">The following example changes the total buffer limit for all 10G ports.<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:150.0pt"><span style="font-size:9.0pt;font-family:Courier;color:black">device(config)# symmetric-flow-control set 2 buffers 128<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:150.0pt"><span style="font-size:9.0pt;font-family:Courier;color:black"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-left:150.0pt"><span style="font-size:9.0pt;font-family:Courier;color:black">Total buffers modified, 1G: 320, 10G: 128<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Thanks Nick <o:p></o:p></p>
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