Very good post by Pushpesh Sharma (thank you)
Storage systems are essential to the data center. Given the exponential rate of data growth, it is increasingly becoming more and more challenging to scale the enterprise storage infrastructure in a cost effective way.
Storage technology over the years has seen incremental technology advancements. The early days of enterprise storage were mainly direct-attached storage (DAS) with host bus adapters (HBAs) and redundant array of independent disks (RAIDs.) The DAS advanced by more faster and more reliable protocols like ATA over Ethernet(ATA), serial attached technology adapters (SATA), external serial attached technology adapters (eSATA), small computer system interface (SCSI), serial attached SCSI (SAS), and fibre channel.
Read on here