data storage – protocol and interface

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Data Storage There are different protocol and interfaces in the data storage world. Each of the interface has own importance in the data storage networking.


There are following interfaces as:

  • SATA (Serial Advance Technology Attachment)
  • SAS ( Serial attached SCSI)
  • NLSAS (Near line SAS)
  • FC (Fiber Channel)

Let us discuss one by one in simple word.

1. SATA Interface

SATA interface

SATA stand for Serial Advance Technology Attachment. This is low end computing device, cheap, low performance. used for low cost components, smaller buffer.

Key point of SATA Interface

  • Low end computing device: This is used in low end computing devices such as PC, laptop, low performance , high capacity disk.
  • Low cost: This is use in desktop, PC, Laptop , high capacity disk drive .
  • Uses: Used at lower tier of auto tiering solution. here, auto tiering means automated progression or demotion of data across different tiers of storage device.

2. SCSI & SAS Interface

dstn-scsi-intereface

Key point of SAS (Serial Attached SCSI) Interface

  • serial point to point protocal.
  • Uses SCSI command set
  • Expensive: SAS drives are more expensive than SATA and offer better performance than SATA
  • performance: SAS offer better performance than STA.
  • SAS drives are dual ported and each port can be connected to different controller resulting in higher performance and reliability.
  • SCSI allows the OS to send multiple read and write request to hard drive.
  • SCSI gives higher transfer rate compared to SATA
  • SAS gives higher transfere rate compared to SCSI

Key point of NL-SAS Interface

This is hybrid of SAS and SATA.

  • NL-SAS (near line SAS) interface are hybrid of SAS and SATA
  • NL-SAS has SAS interface, follows SAS protocol
  • NL-SAS uses SATA disk platters and components

3. FC SAN Inteface

FC SAN interface

A Fibre Channel (FC) port is a hardware pathway in and out of a node that performs data communications over an FC channel.

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