Want to store all Internet? This is (almost) possible. IBM will indeed build a data center with a capacity of 120 storage... Po. The Po (Petabyte) is the unit above To (terabyte) and a Po contains therefore 1,000 To according to the international system. What store sixty times the biggest "backup" of the Internet known, that of archive .org. Currently, the largest data centers are limited to about 15 inches according to IBM.
The set contains approximately 200,000 hard disks (at least 600 GB, probably more) and the file system used is the GPFS (General Parallel File System) of IBM. This file system is adapted to the data centers and uses some techniques of type RAID internally for faster transfer rates, but also to protect the data in the event of failure. And when 200,000 hard drives, failures are "common" and the system is able to adapt: If a disk is defective, the system is for example able to recover the data on other drives and rebuild all without loss of performance, the data being "reconstructed" in the background on a new hard disk. If massive degradation (several hard drives defective at the same time), the system will speed reconstruction on new disks, at that time at the expense of performance. IBM details not capacity reserved for the protection of data, but it is a priori consequent on a system of this type, which must be able to face the judgment of several hard drives at the same time without losing data.
IBM tries everything and keep its hard disks in good condition: hard disks use a liquid cooling system, in place and place of the usual fans which allows to stabilize the temperature.
Note that it will have to wait a few years to find this capability in our machines: from 5 MB to 750 GB in a computer, it took about 25 years (from 1981 to 2006). If you follow the same curve, 120 inch hard drives should not disembark before 2032...
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