Apache Server Redundancy

Hi Guys,

I have this scenario where i need total and transparent redundancy for a
web server hardware.
If the primary server fails, the secondary server should kick in
automatically and without loss of data (user sessions etc).
Kinda like they way they mirror harddisks, except this time it's mirroring
the whole PC, ram inclusive.

Any ideas ?
Thanks in advance.

Best Regards,
Wei Cheng, Yeo
Software Engineer
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Jebsen & Jessen Communications (S) Pte Ltd

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