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<DIV>We are going to update the RAM to 6 gb and no battery backed cache is configured.</DIV>
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<DIV>> I find it hard to believe that you'll see 5000 DORAs per second, unless<BR>>all of your clients come online at the same time. Do they?<BR></DIV>
<DIV>Right now we have 48000 active clients, and i am wonder what would happen after the downtime, when lots of hits will come at the same time. Right now approx 250 concurrent connection (showing in the LB connection established option) are there for the bootps. </DIV>
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<DIV>So i just want to know what would be the sizing and the recommendation as per the Ip database and server specification.</DIV>
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<DIV>Regards</DIV>
<DIV>Daljit Singh<BR><BR>--- On <B>Mon, 1/18/10, Bunny Singh <I><jump2fly82@yahoo.com></I></B> wrote:<BR></DIV>
<BLOCKQUOTE style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: rgb(16,16,255) 2px solid"><BR>From: Bunny Singh <jump2fly82@yahoo.com><BR>Subject: Re: Concurrent hits limitation<BR>To: dhcp-users@lists.isc.org<BR>Cc: sthaug@nethelp.no<BR>Date: Monday, January 18, 2010, 1:19 PM<BR><BR>
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<DIV>We are using dynamic DNS update and running two scsi disk on RAID-1. We are having IBM X3650 server with 4 gb RAM.</DIV>
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<DIV><FONT color=#ff007f><STRONG>How many IP addresses do you have among your 800 subnets? What's your<BR>lease time? What's your *target* for DHCP updates (Request/Ack) per<BR>second?</STRONG></FONT></DIV>
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<DIV>We have around 2, 00,000 Ip's. Our lease time is 4 days, Target hits (DORA) will be 5000 per second.</DIV>
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<DIV>Actually we are in to IPTV services so clients booting their STB's several times in a day.</DIV>
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<DIV>Also Please suggest is the server failover for the huge IP database is good or we will put the servers (without running failover protocol) behind the Loadbalance in Active Standby state.</DIV>
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<DIV>Regards</DIV>
<DIV>Daljit Singh</DIV>
<DIV><BR><BR>--- On <B>Mon, 1/18/10, sthaug@nethelp.no <I><sthaug@nethelp.no></I></B> wrote:<BR></DIV>
<BLOCKQUOTE style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: rgb(16,16,255) 2px solid"><BR>From: sthaug@nethelp.no <sthaug@nethelp.no><BR>Subject: Re: Concurrent hits limitation<BR>To: dhcp-users@lists.isc.org, jump2fly82@yahoo.com<BR>Date: Monday, January 18, 2010, 12:13 PM<BR><BR>
<DIV class=plainMail>> I want to know about the limitation in DHCP server. Actually we are running dhcp on failover mode with 800 subnet and it will be going to expand.<BR>> <BR>> I need to know how many hits (concurrent connections) dhcp services can handle..<BR><BR>Heavily dependent on your disk subsystem. Also on whether you use dhcpd<BR>to perform dynamic DNS updates.<BR><BR>Handling DHCP requests is *disk intensive*. A good RAID subsystem with<BR>lots of battery backed cache, or a solid state disk, will do wonders.<BR></DIV>
<DIV class=plainMail><BR>How many IP addresses do you have among your 800 subnets? What's your<BR>lease time? What's your *target* for DHCP updates (Request/Ack) per<BR>second?<BR><BR>Steinar Haug, Nethelp consulting, <A href="http://us.mc450.mail.yahoo.com/mc/compose?to=sthaug@nethelp.no" target=_blank rel=nofollow>sthaug@nethelp.no</A><BR></DIV></BLOCKQUOTE></TD></TR></TBODY></TABLE><BR></DIV></BLOCKQUOTE></td></tr></table><br>