History
IBM mainframes in the 1970s could share physical disks and file systems if each machine had its own channel connection to the drives' control units. In the 1980s, Digital Equipment Corporation's TOPS-20 and VAX/VMS clusters included shared disk filesystems.
Read more about this topic: Clustered File System
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“There is no example in history of a revolutionary movement involving such gigantic masses being so bloodless.”
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