D-Link DNS-321 manual What is RAID?

Page 48

Section 3 - Configuration

What is RAID?

RAID, short for Redundant Array of Independent Disks, is a combination of two or more disks with the aim of providing fault tolerance and improving performance. There are several different levels of RAID, with each providing a different method of sharing or distributing data amongst the drives. The DNS-321 supports RAID levels 0 and 1.

RAID 0 RAID 0 provides data striping, which spreads

RAID 0

out blocks of data over both drives, but does not

 

provide data redundancy.

 

Although performance is improved, the lack of

 

fault tolerance means that if one drive fails, all

 

data in the array will be lost.

 

RAID 1 RAID 1 provides mirroring over both disks, with

RAID 1

the same read/write speed of a single disk. A

 

RAID 1 array can only be as large as it’s smallest

 

member disk.

 

Because the data is stored on both disks,

 

RAID 1 provides fault tolerance and protection,

 

in addition to performance advantages.

 

D-Link DNS-321 User Manual

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Image 48
Contents Page Table of Contents Package Contents Product OverviewSystem Requirements Introduction Features Power Button Hardware OverviewFront View Drive LightPower Receptacle Reset ButtonRear Panel Connections Ethernet PortInstallation Hardware SetupInstallation Installation Configuration Easy Search UtilityGetting Started Click Easy Search UtilityLogin screen will appear When prompted to configure the Hard Drive Settings Click Configuration After login, you will be redirected to the DNS-321 web UI Web UI Setup WizardPage Page Page LAN Device Settings Advanced Users/GroupsPage Quotas Quota StatusConfiguring Quotas Page Network Access Configuration FTP Server PermissionMax User Idle Time Client LanguageConfiguration UPnP AV Server Password Auto Refresh ITunes ServerConfiguration Dhcp Server Configuration Admin New Password Confirm Save SettingsTools Time System Firmware Upgrade FirmwareMail Alerts Mail Alert Settings Temperature Space StatusFailed Firmware hasPower Management PowerDrives RAID What is RAID? Ddns Status Device InformationSupport Mapping a Drive Configuration Page Download Scheduling DNS-321 login screen will appear Settings here Schedule DownloadsScheduling Settings Save To When Recurring Backup IncrementalTest Replacing or Adding a New Hard Drive Replacing a Hard DriveAdding a New Hard Drive Contacting Technical Support Phone SupportGNU/Linux GPL GNU General Public License PreamblePage Page Page Page END of Terms and Conditions Warranty Limited WarrantyLimited Software Warranty Non-Applicability of WarrantyWhat Is Not Covered Disclaimer of Other WarrantiesLimitation of Liability Governing LawTrademarks Copyright StatementCE Mark Warning FCC StatementRegistration