04-11-2007
Properly Sizing an x86 Server for Internet DNS?
Where I work, we have to very old Alpha boxes running OpenVMS 7. They also have Multinet and are using the BIND component for DNS services. We are planning on retiring those boxes and replacing them with x86 servers running Linux. I've decided to go with Gentoo Linux for this and I've inherited two old boxes (A PIII >1GHz system and an old PIII quad Xeon 500MHz system) to do this with.
My concern is that my co-workers are adamant that the x86 systems won't be able to to keep up with the demand (we host about 70 domains in DNS) the way the Alphas did. My suspicion is that these x86 systems are just fine. However, what I really want to know is where the real utilization for DNS comes in. Is it CPU heavy? Is it RAM heavy? Or is it I/O heavy? I would suspect RAM first and CPU second based on what I've seen at home. But to be honest, in my experience DNS has been a pretty low resource service to run.
I honestly don't see our organization as being that big and 70 domains seems like a very small load even for the PIII boxes I just got. But, I'd be happy with any insight anyone here can provide.
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LEARN ABOUT DEBIAN
multinet
MULTINET(8) System Manager's Manual MULTINET(8)
NAME
multinet - Connect to a Multinet* DECnet over IP server
SYNOPSIS
multinet [options] <local-decnet-addr> <remote-host>
DESCRIPTION
This utility creates a tapX device and copies all the DECnet packets from that over IP to a remote Multinet* server. It provides a way to
connect a Linux box to a remote VMS machine over an IP-only network. Using Linux routing it should be possible to connect DECnet networks
over the internet using this technique.
local-decnet-addr DECnet node address of the tapX interface. This need not be the same as the address used on other interfaces but it might
be less confusing if it is.
remote-host IP address or host name of the remote Multinet server. If you send a HUP signal to the process it will lookup this name again,
so you don't need to restart the server if the remote node changes its IP address.
*Multinet is a product, and probably a trademark, of Process Software.
http://www.process.com and is available free for hobbyist use.
The protocol used here was reverse engineered by Mark Berryman and Christine Caulfield.
OPTIONS
-v Be verbose and dump packet contents to stderr
-1 Advertise as a level 1 router
-2 Advertise as a level 2 router (default)
-D Make the tapX device into the default DECnet device. This will force all traffic to non-local nodes down the Multinet link. IMPOR-
TANT: Due to a kernel bug you should not use this option unless you are using a Linux kernel version 2.6.17 or later.
-p priority
Router priority. Default is 64
-P port
Port to talk to Multinet on (default is 700). Ony change this if you know the Multinet server is listening on a different port
-m MTU Maximum size of packets. (default 576)
-t secs
Timeout for IP connections. If no traffic is seen on the IP connection after this time then the daemon will attempt to restart it.
-H hello timer
How often HELLO messages are sent (default 60) in seconds.
EXAMPLES
multinet -1 -D 3.2 zarqon.tykepenguin.com
SEE ALSO
dnroute(8), ip(8)
DECnet utilities March 30 2006 MULTINET(8)