You can get more than 8TB per server easily.
You better make sure you can serve it all with enough performance though...
Do you have a live site or are you just "guessing" that you will need this much space?
The problem with storage isnt just HARD DRIVES, you NEED PERFORMANCE, and RAID ARRAYS.
RAID means you lose some of the space.
You will want a RAID-10 most likely, meaning you lose 50% of your space to the mirroring.
So you will need a chassis with 8 bays or more. You can run 8x 3TB drives in RAID-10, which would give you 12TB of usable space.
Theres a lot more to it.
Someone has to investigate your current server and see what resources your site is most in need of (CPU, MEM, I/O .. ETC) then build a new machine that satisfies your current usage, plus has additional capacity for growth.
Is there any reason why you want to stuff it all on 1 server anyways???
Time for you to get a proper managed host to take a look at your current shit, and also build you a new machine based on what you ACTUALLY need.
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