<html><head><style type='text/css'>p { margin: 0; }</style></head><body><div style='font-family: Andale Mono; font-size: 10pt; color: #000000'>That probably isn't going to work real well unless you do syslogging to a RAM disk perhaps... Maybe do lease file in RAM disk also... A sudden 100k DHCP packets ... that is more than 25/sec ... that is 100k/sec ... not much out there that could handle that I should think. Perhaps you could talk them into staggering out the power-up from 0600-0700?<br><br><div><br></div><hr id="zwchr"><blockquote style="border-left:2px solid rgb(16, 16, 255);margin-left:5px;padding-left:5px;color:#000;font-weight:normal;font-style:normal;text-decoration:none;font-family:Helvetica,Arial,sans-serif;font-size:12pt;"><b>From: </b>"Don LCTZ Friesen:EX" <Don.Friesen@gov.bc.ca><br><b>To: </b>"Users of ISC DHCP" <dhcp-users@lists.isc.org><br><b>Sent: </b>Wednesday, February 22, 2012 9:54:53 AM<br><b>Subject: </b>RE: DHCP Failover and Performance<br><br><br><br>>2) If you have a widespread outage (such as an area-wide power cut), <br>>then on power resumption you'll have a very significant peak.<br><br><br> There is also power management policy to consider. We only have 100k leases in our lease database, but the powers that be have decided to enforce policy to reduce power consumption. They remote manage all the workstation to power off in the evening, and back on at 7am every morning. They have not staggered the resumption. At 7:00:00 100,000 workstations wake up and talk to our servers. I really can't get an accurate count as to packets per second, because there is evidence that packets are dropping off the UDP buffer (a sniffer sees different a packet set, and they don't match up). After 20 minutes everyone has their lease.<br><br> Our default lease duration is 16 days.<br><br><br>Don.<br>_______________________________________________<br>dhcp-users mailing list<br>dhcp-users@lists.isc.org<br>https://lists.isc.org/mailman/listinfo/dhcp-users<br><br></blockquote><br></div></body></html>