Failover on a large DHCP system

David W. Hankins David_Hankins at
Fri May 8 16:41:35 UTC 2009

On Fri, May 08, 2009 at 10:09:29AM -0600, Nicholas F Miller wrote:
> With constant restarts of DHCP and the need for 
> failover to redistribute the pools on restarts I think the server load and 
> disk access would be too high.

The disk access footprint between failover restarts is only the
"changes" to the database.  It doesn't remirror the lease db every
reconnect - they only update each other with any new bindings that
ocurred during the blackout.

With huge numbers of leases, it can be a problem however, as it causes
both servers to traverse the entire lease database (in memory) right

David W. Hankins	"If you don't do it right the first time,
Software Engineer		     you'll just have to do it again."
Internet Systems Consortium, Inc.		-- Jack T. Hankins
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