Thecus Technology M3800 manual Stripe Size, Disk Usage

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RAID 1

RAID 1 mirrors all data from one hard disk drive to a second one hard disk drive, thus providing complete data redundancy. However, the cost of data storage capacity is doubled.

This is excellent for complete data security.

RAID 5

RAID 5 offers data security and good performance. It is best suited for networks that perform many small I/O transactions at the same time, as well as applications that require data security such as office automation and online customer service. Use it also for applications with high read requests but low write requests.

RAID 5 includes disk striping at the byte level and parity information is written to several hard disk drives. If a hard disk fails the system uses parity stored on each of the other hard disks to recreate all missing information.

JBOD

Although a concatenation of disks (also called JBOD, or "Just a Bunch of Disks") is not one of the numbered RAID levels, it is a popular method for combining multiple physical disk drives into a single virtual one. As the name implies, disks are merely concatenated together, end to beginning, so they appear to be a single large disk.

As the data on JBOD is not protected, one drive failure could result total data loss.

Stripe Size

The length of the data segments being written across multiple hard disks. Data is written in stripes across the multiple hard disks of a RAID. Since multiple disks are accessed at the same time, disk striping enhances performance. The stripes can vary in size.

Disk Usage

When all 3 disks are of the same size, and used in RAID, M3800 disk usage percentage is listed below:

RAID Level

Percentage Used

RAID 0

100%

RAID 1

50%

RAID 5

66%

JBOD

100%

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Contents Thecus M3800 Copyright and Trademark Notice Limited WarrantyAbout This Manual Safety Warnings Table of Contents Additional Feature Setup Appendix a Product Specifications Appendix D Active Directory Basics Overview IntroductionProduct Highlights Package Contents Front Panel Front PanelBack Panel Rear PanelHard Disk Installation Hardware InstallationBefore You Begin Cable Connections Thecus Setup Wizard First Time SetupPage Page Setting up the RAID RAID Setup and Firmware InstallationLCD Operation Display ModeLCD Controls USB CopyNetwork Setup Typical Setup ProcedureCreate Local Users or Setup Authentication Create Folders and Set Up ACLsStart Services System Management Web Administration InterfaceMenu Bar Language SelectionMenu Bar Product Information Status MenuSystem Status Product InformationPrinter Status Wake-up On Lan ConfigurationWake-Up On Lan WOL Printer StatusSata Information Storage ManagementESATA Information Disks InformationRAID Information USB Disk InformationESATA Information USB InformationRAID Level RAID ConfigurationRAID Information RAID LevelsRAID Settings RAID SettingsCreating a RAID Deleting a RAIDAdding Folders Folder ManagementFolder Add FolderDeleting Folders Editing FoldersNFS Share Edit FolderAccess Control List Folder Access Control List ACLWAN Configuration WAN ConfigurationNetwork Management Dhcp Configuration LAN ConfigurationLAN Configuration Dhcp ConfigurationWlan Configuration Wlan ConfigurationWlan Dhcp Configuration Typical Ddns Configuration Procedure Ddns ConfigurationDdns Support AFP Apple Network Setup Web Services ConfigurationWeb Service Apple Network ConfigurationNFS Support NFS SetupLocal User Configuration Local User ConfigurationUser and Group Management Adding UsersLocal Groups Configuration Local Groups ConfigurationModifying Users Deleting UsersModifying Groups ADS/NT ConfigurationDeleting Groups AD Domain Example Information ADS/NT SupportNotification Configuration System SettingsSystem Notifications System LogsSystem Logs Time and Date SettingsTime System Configuration Download/Upload System Configuration Backup and RestoreModule Management Module ManagementUpgrading System Firmware Reset to Factory Default SettingsReboot and Shutdown System Change Administrator PasswordChange Administrator Password TV Setup Scheduled Power On/OffLogout FTP Server Additional Feature SetupITunes Server ITunes ConfigurationMedia Server Media Manager Settings Connecting DMAs to the Media ServerAdding Media Share Folders Download Tasks Download ManagerAdding an Http Task Page Page Adding an FTP Task Page Page Page Adding a BT Task Page Page Scheduling Downloads Deleting TasksDownload Schedule Under Download Schedule, set Scheduler to Enable Web Cam Preview Web Cam ServerWeb Camera Adding a Web Cam Schedule Page Windows XP SP2 Printer ServerPage Windows Vista Page Page Login Using the M3800Web User Interface Web User Interface Using WebDiskWebDisk Adding Music Files Using Music ServerPlaying Music Files MusicPassword Protecting Albums Using Photo GalleryManaging Albums and Photos Creating AlbumsWindows XP Publishing Wizard Uploading Pictures to AlbumsPage Page Page Page Slide Shows Exif InformationWindows Mapping a Client PC to the M3800Apple OS Page Thecus Backup Utility File BackupAdd New Task Apple OS X Backup Utilities Windows XP Data BackupTips and Tricks Remote AdministrationUSB and eSATA Storage Expansion Adding a Spare DiskPart I Setup a DynDNS Account Firewall Software ConfigurationPart II Enable Ddns on the Router Part III Setting up Virtual Servers HttpsFile System Check Replacing Damaged Hard DrivesHard Drive Damage Replacing a Hard DrivePage Page Troubleshooting Page Hardware Specifications Appendix a Product SpecificationsSoftware Specifications PNG, BMP, AVI, WMV, WMA, LPCM, Jpeg Appendix B Customer Support Thank you for choosing ThecusBenefits Appendix C RAID BasicsRAID Levels Improved PerformanceDisk Usage Stripe SizeAppendix D Active Directory Basics What is Active Directory?ADS Benefits Source Code Availability Appendix E Licensing InformationGNU General Public License Cgic License TermsPage Page Page 104