Is this what your error looks like?  DHCP only works sporadically?
2007-01-18 13:40:43	Kernel.Error	172.17.7.252	Jan 18 23:40:43
/kernel: pid 68811 (php), uid 0 on /: file system full
2007-01-18 13:40:43	Kernel.Error	172.17.7.252	Jan 18 23:40:43
/kernel: pid 97193 (dhcpd), uid 0 on /: file system full

I had the above problem 2 weeks ago with dhcp and all.  I lowered the
number of log entries to keep in the log settings to half and it hasn't
reoccurred since.  Syslog is on anyways...  I found the fix in a
previous thread so it's worked for at least 2 of us so far.

Maybe it helps?

>>> "Lee Sharp" <leesharp at hal dash pc dot org> 2/1/2007 10:55 AM >>>
From: "Naveen" <naveen at palettemm dot com>

> I am facing some problem with Mono, its saying that in system Log
file
> system full and in dhcp log I am getting error no space left on
device and
> users cant able to get DHCP ip address from Mono. Appreciate if some
one
> help me .

We need some more information here.  Enclose the output of status.php 
sanitized appropriately.

                                    Lee