extremely slow DHCPD startup time

[Greg Sloop <gregs@sloop.net>]

I'm sure others will have some useful suggestions - but I do know that
improving disk I/O can seriously improve performance.
I'm not sure if that will improve restart/start/reload times.

It would be pretty easy to test though, say swapping for an SSD/Nvme.
(Or if you like living dangerously, putting the disk in RAM.)



On Thu, Aug 4, 2022 at 12:02 PM Shane Merritt <smerritt at ua.edu> wrote:

> I have a failover pair of DHCP servers running 4.4.2-P1 that handle a DHCP
> for a very large wireless network (>75k devices active at any time). The
> leases file on these boxes is around 200 megabytes.  The problem I am
> having is when I need to make a change and restart, DHCPD takes over 25
> minutes to start giving out addresses.  I assume this is due to the large
> lease file.  I see that there are tons of leases in the file that are
> “binding state free” that in some cases are months old.  Are there any
> suggestions to improve this situation?
>
>
>
>
>
> Shane Merritt
>
> Office of Information Technology
> The University of Alabama
> smerritt at ua.edu
>
>
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