How to have 2 servers running as one?

Ok, i have 2 servers, running fedora and here is what i want to attempt to do.

Server 1 has 1x 250gb hd
Server 2 has 1x 250gb hd

Now how could i have it for example.

Like merge them togather and have it running as one server

So it would have 500gb total space as it would be still 2, but the hard drives are like "clustered"...?

Is there a possible way of doing this?

If that is not possible, is there any way apache running on port 80, and some how on the other server apache port 80, and it share 1 ip,.... i know its kinda sketchy, but i would like to find out if it was possible to do...?

 

 

 

 

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