Re: content aware switching

Theo,
  
  Thankyou!

ravikumar
--- Theo Schlossnagle <[email protected]> wrote:
> Ravi Kumar Munnangi wrote:
> 
> >Hi users,
> >  
> >  I have been using mod_backhand for load
> balancing.
> >Now I want to use content aware dispatching
> techique.
> >Suppose I have 3 servers-x,y,z.
> >The web content is not fully replicated on these
> >servers.
> >In fact I have divided whole web content to three
> >parts
> >each served by one server. 
> > 
> > Now here there are two cases for dispatching.
> >1. If a server doesn't know the contents with other
> >servers.
> >   In this case Iam using the directive
> "removeSelf"
> >   so that the server which contains the data will
> >serve.
> >2. If a server knows the content what other servers
> >have.
> >   Here which directive will be useful to redirect
> >   the request to a particular server?
> >   what is the difference between
> HTTPRedirectToName
> >   and HTTPRedirectToIP?
> >   Can I use these directives for this purpose?
> >   Or any other alternative?
> >   Please reply me with where I should put these
> >directives and with syntax.
> >  
> >
> I am not sure I understand what you are trying to
> accomplish...
> 
> (1) ou say you have three servers and the a given
> box only knows that it 
> doesn't have it, so you use removeSelf.  This is
> flawed with more than 
> two servers.  mod_backhand will not proxy any
> request that has already 
> be proxied by backhand -- to prevent ping-ponging. 
> So, if one of three 
> servers doesn't have the content in question, it has
> a 50/50 chance of 
> directing to a server that does have it.  If it
> misdirects, that is the 
> end of life for that request.
> 
> (2) HTTPRedirect* are special in that they don't
> proxy anything.  They 
> redirect on an HTTP level by sending a Loction: HTTP
> header back.  Use 
> them with care.
> 
> It sounds to me like you could do this:
> 
> www-1 has content under /1/
> www-2 has content under /2/
> www-3 has content under /3/
> 
> <Directory /path/to/1/>
> BackhandFromSO byHostname.so byHostname www-1
> </Directory>
> <Directory /path/to/2/>
> BackhandFromSO byHostname.so byHostname www-2
> </Directory>
> <Directory /path/to/3/>
> BackhandFromSO byHostname.so byHostname www-3
> </Directory>
> 
> -- 
> // Theo Schlossnagle
> // Principal Engineer --
> http://www.omniti.com/~jesus/
> // Postal Engine -- http://www.postalengine.com/
> // Ecelerity: fastest MTA on Earth
> 
> 
> _______________________________________________
> backhand-users mailing list
> [email protected]
>
http://lists.backhand.org/mailman/listinfo/backhand-users


__________________________________
Do you Yahoo!?
Yahoo! Small Business $15K Web Design Giveaway 
http://promotions.yahoo.com/design_giveaway/