NETGEAR Pioneer Edition manual Overview of RAID Levels and X-RAID2, Raid

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ReadyNAS Pro Pioneer Edition User Guide

expandable RAID technology. Your system comes preconfigured with X-RAID2. However, you can switch between the two modes through a factory default reset process described in “Configuring RAID” on page 6-7.”

Overview of RAID Levels and X-RAID2

This section provides a basic overview of RAID and X-RAID2. RAID is an acronym for Redundant Array of Independent Disks. It can store data in a way that writes extra data derived from the original data across the array organized so that the failure of one (sometimes more) disks in the array will not result in loss of data. A RAID level determines how data is kept redundant. The most popular ones being levels 0, 1, 5, and 6. RAID 0 does not provide redundancy. Also, RAID arrays can be faster to write to and read from than a single disk. These various approaches entail different trade offs of protection against data loss, capacity, and speed.

RAID 0

RAID 0 (striped disks) distributes data across several disks in a way that gives improved speed and full capacity, but all data on all disks will be lost if any one disk fails

RAID 1

RAID 1 (mirrored disks) could be described as a backup solution, using two or more disks that each store the same data so that data is not lost as long as one disk survives.

For example, a two-disk RAID 1 volume can sustain a one-disk failure and continue running. A three-disk RAID 1 volume can sustain up to two disk failures. If a disk fails, the data is retrieved from the surviving disk. Unfortunately, RAID 1 capacity utilization is not optimal in a configuration of three or more disks. The capacity is limited to the size of the smallest disk in the RAID set.

RAID 5

RAID 5 (striped disks with parity) provides the best balance of capacity and performance while providing data redundancy. It combines three or more disks in a way that protects data against loss of any one disk; the storage capacity of the array is reduced by one disk.

RAID 5 provides redundancy by striping data across three or more disks and keeping the parity information on one of the disks in each stripe. In case of disk failure, the surviving disks and the parity disk are used to reconstruct the lost data, providing data transparently to the user application. When the failed disk has been replaced with a good disk, the reconstructed data is written out to the new disk; when the reconstruction (or sometimes referred as RESYNC) process is complete, the volume returns to a redundant state. The capacity of a RAID 5 volume is the

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Setting Up and Managing Your ReadyNAS Pro

v1.0, December 2008

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Contents ReadyNAS Pro Pioneer Edition User Guide Statement of Conditions Technical SupportTrademarks Certificate of the Manufacturer/ImporterProduct and Publication Details V1.0, December Contents Chapter Managing User Access Chapter Securing Your Data Appendix a Share Access from MAC and Linux Systems About This Manual Conventions, Formats, and ScopeHow to Use This Manual How to Print This ManualRevision History Xii About This Manual What is the ReadyNAS Pro? Chapter Getting AcquaintedRAID Is Expandable RAID What Are the Benefits of X-RAID and X-RAID2?RAID Simplifies Redundancy X-RAID Data Volume RAID2 Is Even More FlexibleIntroducing the Status Displays, Ports, and Drive Bay Front and Side PanelDrive Bay Rear Panel Initial Setup Choosing a Location for a ReadyNAS ProRAIDar Setup Utility Default IP Address, Login Name, and PasswordFrontView Management Console Netgear ReadyNAS Community Setting Up and Managing Your ReadyNAS Pro Customizing Network SettingsEthernet Interfaces ReadyNAS Pro Pioneer Edition User Guide DNS Settings Global Network SettingsDefault Gateway HostnameWins Updating the Admin Password Route a Manual Routing TableReadyNAS Pro Pioneer Edition User Guide Selecting Services for Share Access Standard File ProtocolsReadyNAS Pro Pioneer Edition User Guide Streaming Services Understanding Volume Management Discovery ServicesOverview of RAID Levels and X-RAID2 RAIDRAID2 Volume Management for Flex-RAID Deleting a VolumeAdding a Volume RAID SettingsAdding a Second Disk for Redundancy Volume Management for X-RAID2Adding More Disks Volume Maintenance Replacing All Your Disks for More CapacityWorking with USB Volumes Disk Scrubbing with Auto Parity FixUSB Flash Device Option DisconnectSetting Up Printers Print Shares over CIFS/SMBIPP Printing Managing Print Queues Adjusting System Settings Clock, System Time, and NTP OptionsAlerts, Alert Contacts, Alert Settings, and Smtp Language Settings Updating ReadyNAS Pro Pioneer Edition Updating from the Netgear Web Site Updating from a Local DriveConfiguring Automatic Update Settings Configuration Backup Restoring the Factory Default SettingsReadyNAS Pro Pioneer Edition User Guide ReadyNAS Pro Pioneer Edition User Guide Chapter Managing User Access Understanding Disk Share Security AccessSetting Up User and Group Accounts Managing GroupsPlease note the following Spaces around commas are ignored Managing Users Fred,hello123 Setting Accounts Preferences Changing User PasswordsManaging Your Shares Adding Shares Managing Shares Setting Share Access Hosts allowed access 192.168.2.101 Advanced Options Web Browser ReadyNAS Pro Pioneer Edition User Guide FTP/FTPS # rsync -a ipaddrbackup /tmp RsyncRemote Access Networked DVD Players and UPnP AV Media AdaptersRemote FTP Access Go to Services Standard File Protocols and enable FTPRemote Http Access Http ReadyNAS Pro Pioneer Edition User Guide Adding a New Backup Job Configuring Backup JobsChapter Securing Your Data Select Backup Source Select Backup Destination Myfolder media/Videos My Folder My Documents/My PicturesChoose Backup Schedule Choose Backup Options All Logs linkViewing the Backup Schedule Programming the Backup Button Editing a Backup Job Viewing the Backup LogBacking Up the ReadyNAS to a USB Drive ReadyNAS Pro Pioneer Edition User Guide ReadyNAS Pro Pioneer Edition User Guide Chapter Optimizing Performance PerformanceAdding a UPS to Protect Against Power Failures Power Management Disk Spin-Down OptionUPS Configuration Power TimerWake-On-LAN Viewing System Status Chapter Managing Levels of ServiceHealth Logs Replacing a Failed Disk Choosing a Replacement DiskReplacing a Failed Disk ReadyNAS Pro Pioneer Edition User Guide Using the System Diagnostic Menu Resynchronizing the VolumeUse the OS Reinstall Option to Re-install the Firmware Configuring RAID Shutdown Appendix a Share Access from MAC and Linux Systems MAC OSAFP over Bonjour Figure A-2AFP over AppleTalk Figure A-4Figure A-6 Enter a valid user account and password, and click Connect Figure A-10 Accessing Shares from Linux/Unix Figure A-12ReadyNAS Pro Pioneer Edition User Guide Appendix B Related Documents Document LinkReadyNAS Pro Pioneer Edition User Guide Index NumericsIndex-2 Index-3 Index-4
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