Failover on a large DHCP system
David W. Hankins
David_Hankins at isc.org
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
now.
--
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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