DHCPD performance -- solid-state disks?

Shawn Routhier sar at isc.org
Mon Sep 12 18:57:31 UTC 2011

In addition to the disk options people have already
mentioned you may want to investigate using the
delayed-ack feature.  This feature allows the
server to group a set of commits into a single
fsync when it's reasonable to do so.


On 09/09/2011 07:51, John Hascall 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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