The early days of shared storage were focused around fixing some of the problems experienced with having multiple disk drives in every server, namely – availability, resiliency, shared access and efficiency.  Shared storage arrays resolved many of these issues by providing centralised shared, optimised and managed storage resources.  The popularity of shared storage was made possible by Storage Area Networks, SANs and the connectivity provided by Fibre Channel, iSCSI, NFS/SMB and to a certain degree FCoE.

As these systems have evolved, hard disk drives were seen as the first bottleneck, so…