Module Two Part One

Serial Advanced Technology Attachment (SATA)

Hard drive interface

Faster transfer times

More flexible cabling

Easier plug-and-play connections

Transfers data in serial bursts instead of parallel

Storage Types/Connections

Network Attached Storage (NAS)

Used to provide data storage not directly attached to servers

Specialized storage

Provides centralized fault-tolerant data storage

NAS is separate device on LAN and has its own IP address

Able to provide multiple clients on the network with access to

the same files

Storage Types/Connections

Storage Area Network (SAN)

Specialized high-speed network of storage devices connected

to servers

Fault tolerance is built-in

Transmission media is fibre channel

Faster/more efficient than NAS

Best suited for

Huge quantities of data

High availability requirement

Large enterprises

Redundant Array of Independent Disks (RAID)

Increases capability to store and retrieve data

Limits data lost due to hardware failure

“Fault Tolerance”

Many different considerations

Hardware vs Software RAID

Different raid levels

0, 1, 5, 6, 10, etc.

Configure System Storage

Redundant Array of Independent Disks (RAID)

RAID Types

Hardware RAID

Set of disks and a separate disk controller

Disks are managed exclusively by RAID disk controller’s

interface

Software RAID

Software that implements RAID virtually

Cheaper – Does not require special hardware

Configure System Storage

RAID Levels

RAID 0: Disk Striping (Block-by-Block)

Data is split evenly across two or more disks

Improved read & write speeds

Easiest to implement

NOT fault-tolerant

If a drive is lost, all data is lost

RAID 0 IMAGE: Network Encyclopedia-

CIBERFORMA LDA

Configure System Storage

RAID Levels

RAID 1: Disk Mirroring/Duplexing (Block-by-Block)

Data on one disk is copied to the other

Ensures fault tolerance

If one drive is lost, the other keeps running

Performance increase for read operations

Performance increase in writing operations

RAID 1 IMAGE: Network Encyclopedia-

CIBERFORMA LDA

Configure System Storage

RAID Levels

RAID 5: Disk Striping with Distributed Parity (Block-Level)