DHCP Failover and Performance

[perl-list]

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? 

----- Original Message -----

> From: "Don LCTZ Friesen:EX" <Don.Friesen at gov.bc.ca>
> To: "Users of ISC DHCP" <dhcp-users at lists.isc.org>
> Sent: Wednesday, February 22, 2012 9:54:53 AM
> Subject: RE: DHCP Failover and Performance

> >2) If you have a widespread outage (such as an area-wide power cut),
> >then on power resumption you'll have a very significant peak.

> 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.

> Our default lease duration is 16 days.

> Don.
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