<html><head><style type='text/css'>p { margin: 0; }</style></head><body><div style='font-family: Andale Mono; font-size: 10pt; color: #000000'><font face="'Andale Mono'" size="2">You might consider making your lease length a bit longer. If you are having 25 bindings/sec with only 100k clients, then you must only have a 2 hour lease. I would not run with less than an 8 hour lease in any environment. You might even consider longer than this depending on what kind of clients they are. A week wouldn't be out of bounds if this is a non-hostile corporate network etc...</font><br><br><div style="color: rgb(0, 0, 0); font-family: 'Andale Mono'; font-size: 10pt; "><br></div><hr id="zwchr" style="color: rgb(0, 0, 0); font-family: 'Andale Mono'; font-size: 10pt; "><blockquote style="border-left-width: 2px; border-left-style: solid; border-left-color: rgb(16, 16, 255); margin-left: 5px; padding-left: 5px; font-weight: normal; font-style: normal; text-decoration: none; "><b style="color: rgb(0, 0, 0); font-family: Helvetica, Arial, sans-serif; font-size: 12pt; ">From: </b><font face="Helvetica, Arial, sans-serif" size="3">"LONGREE Yves (SDV/PSE)" <yves.longree@belgacom.be></font><br><b style="color: rgb(0, 0, 0); font-family: Helvetica, Arial, sans-serif; font-size: 12pt; ">To: </b><font face="Helvetica, Arial, sans-serif" size="3">"Users of ISC DHCP" <dhcp-users@lists.isc.org></font><br><b style="color: rgb(0, 0, 0); font-family: Helvetica, Arial, sans-serif; font-size: 12pt; ">Sent: </b><font face="Helvetica, Arial, sans-serif" size="3">Wednesday, February 22, 2012 3:53:21 AM</font><br><b style="color: rgb(0, 0, 0); font-family: Helvetica, Arial, sans-serif; font-size: 12pt; ">Subject: </b><font face="Helvetica, Arial, sans-serif" size="3">RE: DHCP Failover and Performance</font><br><br>
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<p class="MsoNormal" style="color: rgb(0, 0, 0); font-family: Helvetica, Arial, sans-serif; font-size: 12pt; "><span style="font-size:9.0pt; font-family:"Verdana","sans-serif"; color:blue">Hello,</span></p>
<p class="MsoNormal" style="color: rgb(0, 0, 0); font-family: Helvetica, Arial, sans-serif; font-size: 12pt; "><span style="font-size:9.0pt; font-family:"Verdana","sans-serif"; color:blue"> </span></p>
<p class="MsoNormal" style="color: rgb(0, 0, 0); font-family: Helvetica, Arial, sans-serif; font-size: 12pt; "><span style="font-size:9.0pt; font-family:"Verdana","sans-serif"; color:blue">I have also considered performances aspect in failover</span></p>
<p class="MsoNormal" style="color: rgb(0, 0, 0); font-family: Helvetica, Arial, sans-serif; font-size: 12pt; "><span style="font-size:9.0pt; font-family:"Verdana","sans-serif"; color:blue">Even on good servers, I was not able to go higher then 25 binding/sec (Discover-offer-request-ack for 100.000 clients)</span></p>
<p class="MsoNormal" style="color: rgb(0, 0, 0); font-family: Helvetica, Arial, sans-serif; font-size: 12pt; "><span style="font-size:9.0pt; font-family:"Verdana","sans-serif"; color:blue">I also observed that performance is going down as the leasefile grows</span></p>
<p class="MsoNormal" style="color: rgb(0, 0, 0); font-family: Helvetica, Arial, sans-serif; font-size: 12pt; "><span style="font-size:9.0pt; font-family:"Verdana","sans-serif"; color:blue"> </span></p>
<p class="MsoNormal" style="color: rgb(0, 0, 0); font-family: Helvetica, Arial, sans-serif; font-size: 12pt; "><span style="font-size:9.0pt; font-family:"Verdana","sans-serif"; color:blue">I tried to put leasefile in ramdisk or using some virtualization (running two instance of the process on same physical HW) but with few gain.</span></p>
<p class="MsoNormal" style="color: rgb(0, 0, 0); font-family: Helvetica, Arial, sans-serif; font-size: 12pt; "><span style="font-size:9.0pt; font-family:"Verdana","sans-serif"; color:blue"> </span></p>
<p class="MsoNormal" style="color: rgb(0, 0, 0); font-family: Helvetica, Arial, sans-serif; font-size: 12pt; "><span style="font-size:9.0pt; font-family:"Verdana","sans-serif"; color:blue">Any tips on how improving performances ?</span></p>
<p class="MsoNormal" style="color: rgb(0, 0, 0); font-family: Helvetica, Arial, sans-serif; font-size: 12pt; "><span style="font-size:9.0pt; font-family:"Verdana","sans-serif"; color:blue"> </span></p>
<p class="MsoNormal" style="color: rgb(0, 0, 0); font-family: Helvetica, Arial, sans-serif; font-size: 12pt; "><span style="font-size:9.0pt; font-family:"Verdana","sans-serif"; color:blue">regards</span></p>
<p class="MsoNormal" style="color: rgb(0, 0, 0); font-family: Helvetica, Arial, sans-serif; font-size: 12pt; "><span style="font-size:9.0pt; font-family:"Verdana","sans-serif"; color:blue">Yves</span></p>
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