DHCPD performance -- solid-state disks?

Ray DeJean ray at selu.edu
Fri Sep 9 15:20:42 UTC 2011


As others may chime in, I believe your best bet is to create a ramdisk and
store the leases file there.  That's your best performance.  Also note your
logging, as our /var/log/messages file (on CentOS) also gets hit pretty

Your start/stop scripts should copy the lease file to/from the ramdisk.  And
you should probably have a script to copy the lease file to disk every few
minutes as well.

Ray DeJean
Systems Engineer
Southeastern Louisiana University
email: ray at selu.edu

On Fri, Sep 9, 2011 at 9:51 AM, John Hascall <john at iastate.edu> wrote:

> All,
> We are starting to see our dhcpd server unable to cope with
> our peak load (the top of the hour when students move from
> one building to another).   Ideally, our wireless infrastructure
> would allow them to keep their address as they roam, but this
> is not the case, so we see large surges in lease-swapping during
> these 10 minute periods.  It looks like we can do about 50/second
> with our current hardware.  The CPUs are never above a few percent
> busy, so my belief is that we are limited by our synchronous-write
> speed to the lease file.  Does this seem correct?
> We are currently using mirrored 15k SAS drives.  Is our best
> move to go to solid-state disk?
> Thanks for any advice you might have!
> John
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