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best apache loadbalancing techniques

I am planning to deploy the following structure:

\             \             \
 proxy1   proxy2   proxy3  ---->\
   \             \             \              \
   apache1  apache2  apache3  ---> common storage server via NFS
     \              \             \            /
     mysql1    mysql2    mysql3  /

As You see, there are 3 exactly same copies of one branch that demand
load balancing.

Of course there's one obvious option - DNS loadbalancing when I will
put alll proxies under one host.domainname .

What I want to achieve is simple administration - I want to be able to
make our customers no to use one branch but use others while making
updates etc, while 2 existing branches are online.

What loadbalancing technique should I use to obtain a non-interrupted service ?
We don't want to buy any loadbalancers vrrp protocol etc. . The
infrastructure will be also connected to switch that we dont have
access to.

regards and thank You for your time,

Wojciech Ziniewicz
Unix SEX :{look;gawk;find;sed;talk;grep;touch;finger;find;fl
ex;unzip;head;tail; mount;workbone;fsck;yes;gasp;fsck;more;yes;yes;eje
ct;umount;makeclean; zip;split;done;exit:xargs!!;)}

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