Re: Round Robin
From: John Negus (jnegus_at_mask.msetechnology.com)
Date: 12/02/04
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Date: Thu, 2 Dec 2004 12:56:45 -0500
Hello Ace,
I completely agree with your statement "Round Robin is more of a pseudo
load balance mechanism". This is why, in my reply to the original
question, I stated "This provides a FORM of load balancing".
As for your statement, "Jonathan posted how Round Robin works", I do
not agree . If you read his link carefully, it focus's more on how
Round Robin will NOT work in certain environments than how it actually
does work in a Microsoft environment. As this is a Microsoft Public
News Group. I took it upon myself to explain how it works in a
Microsoft environment and in a later post provided a simple test to
prove this.
I would not recommend using this as a complete load balancing solution
though I have used this myself as a cheap alternative very successfully
(you need to be aware of the full environment to be sure it will work as
planned). A couple of examples: An internal read only web site with
multiple servers and a TS farm using a Session Directory Server.
-- John Negus MSEtechnology -- "Ace Fekay [MVP]" <PleaseSubstituteMyActualFirstName&LastNameHere@hotmail.com> wrote in message news:%23c4u37B2EHA.3500@TK2MSFTNGP09.phx.gbl... > In news:ek1SUHW0EHA.1924@TK2MSFTNGP10.phx.gbl, > John Negus <jnegus@mask.msetechnology.com> made a post then I > commented below >> If a company has a web site called www.xyz.com, to handle demand, has >> setup 3 web servers with identical content for the web site >> (WebServer1, WebServer2 and WebServer3). There will be 3 DNS records >> for the IP address of each server. >> >> When a client sends a query to the DNS server to resolve www.xyz.com >> the DNS server sends back the IP address of all 3 records with >> Webserver1 at the top of the list, WebServer2 in the middle and >> WebServer3 at the bottom. >> >> If round robin is enabled on the DNS server, the next request for >> www.xyz.com that the DNS server receives it will send all 3 records >> again but this time will place WebServer3 at the top of the list, >> Webserver1 in the middle and WebsServer2 at the bottom (rotating the >> record at the top of the list for the last request to the bottom). >> This provides a form of load balancing as the clients try to contact >> the server at the top of the list first. >> >> Round Robin can be enabled by using the DNS manager console. It is >> configured at server level and can be set by checking the Round Robin >> box on the Advanced tab of the Properties of your DNS server. >> >> HTH >> >> -- >> John Negus >> MSEtechnology >> > > Round Robin is more of a pseudo load balance mechanism and not to be > relied upon. If one needs a true load balance mechanism, don't use > DNS, but rather use the NLB features built in to Windows 2000 and > Windows 2003, or even clustering in an Active/Active cluster, or > better yet, products such as Dell's BigIP. IBM and HP/Compaq have > similar products. > > Jonathan posted how Round Robin works. It's not necessarily by the > "top of the list" first. > > > -- > Regards, > Ace > > G O E A G L E S !!! > Please direct all replies ONLY to the Microsoft public newsgroups > so all can benefit. > > This posting is provided "AS-IS" with no warranties or guarantees > and confers no rights. > > Ace Fekay, MCSE 2003 & 2000, MCSA 2003 & 2000, MCSE+I, MCT, MVP > Microsoft Windows MVP - Windows Server - Directory Services > > Security Is Like An Onion, It Has Layers > HAM AND EGGS: A day's work for a chicken; > A lifetime commitment for a pig. > -- > ================================= > >
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