ISC DHCP on Virtual Machines

[Chuck Anderson]

On Tue, Jan 24, 2012 at 02:40:53PM +0100, Bjarne Blichfeldt wrote:
> > Dear all,
> 
> > Let suppose multiple DHCP servers running in failover pairs,
> > Considering putting  them on Virtual Machines (VMWARE) in order to spare physical servers:
> > - Is it technically possible ?
> > - Is it a good conceptual choice ?
> 
> > Thanks in advance for your comments
> > Regards
> > yves
> 
> 
> We have tried that and we where not happy.  Our dhcp servers are running on linux RHEL5.
> It turned out our vmware farm was not quite as stable as we thought.  Many times work on the SAN  made the linux boxes  remount their disks as readonly.
> Furthermore the diskperformance can vary a lot. 
> We have around 10.000 workstations depending on dhcp. Imagine the noise when they don't work.
> 
> We ended up with two physical servers located in separate computer rooms and have been happy ever since.

I suggest using local disk for DHCP VMs instead of SAN.