APC iSCSI SATA II installation and configuration manual Definition of RAID Levels

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Definition of RAID Levels

RAID 0 is typically defined as a group of striped disk drives without parity or data redundancy. RAID 0 arrays can be configured with large stripes for multi-user environments or small stripes for single-user systems that access long sequential records. RAID 0 arrays deliver the best data storage efficiency and performance of any array type. The disadvantage is that if one drive in a RAID 0 array fails, the entire array fails.

RAID 1, also known as disk mirroring, is simply a pair of disk drives that store duplicate data but appear to the computer as a single drive. Although striping is not used within a single mirrored drive pair, multiple RAID 1 arrays can be striped together to create a single large array consisting of pairs of mirrored drives. All writes must go to both drives of a mirrored pair so that the information on the drives is kept identical. However, each individual drive can perform simultaneous, independent read operations. Mirroring thus doubles the read performance of a single non-mirrored drive and while the write performance is unchanged. RAID 1 delivers the best performance of any redundant array type. In addition, there is less performance degradation during drive failure than in RAID 5 arrays.

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Contents ISCSI Sata II RAID Subsystem Table of Contents Advanced Operation Introduction Key Features Technical Specifications Copy TerminologyWidth RAID rowMechanism to control access to an iSCSI storage system over Scsi Accessed Fault- Tolerant EnclosuresScsi Enclosure Services ISNS Internet Storage Name ServiceRAID Fundamentals RAID ConceptsDisk Striping Definition of RAID Levels Page Summary RAID Management RAID Level Description Min. DrivesVolume Relationship Diagram RAMPackaging, Shipment and Delivery Unpacking the SubsystemFront View HDD Status IndicatorIdentifying Parts of the iSCSI RAID Subsystem Parts FunctionLCD Display Panel LCD Control Module LCM Environment Status LEDsRear View Connecting the iSCSI RAID Subsystem to Your Network Powering OnInstalling Hard Drives Carrier Open ButtonISCSI Introduction HBA IP SANManagement Methods Web GUIRemote Control Secure Shell Console Serial PortEnclosure LCD Control Module LCMRAID System Buzzer Setting Mail setting Æ MailISCSI RAID Subsystem GUI Hierarchy Shutdown LoginReboot and Æ Reboot / Shutdown Sure to logout?Status Indicators LanguageQuick Install System Configuration System Setting IP Address Login Setting Mail Setting Notification Setting Net-SNMPhttp//net-snmp.sourceforge.netPage ISCSI Config Entity Property2 NIC IP settingsDefault gateway MTU / Jumbo frameNode Session Chap Account Volume Configuration Volume Create Wizard Page Physical Disk It’s done. View the Physical disk Vendor Serial Type Write cache Standby PD operations descriptionRAID Group It’s done. View the RAID groupRG column description Name TotalGB FreeGB Status HealthShow RAID group detail information Virtual Disk It’s done. View the Virtual disk VD column descriptionRight Priority Bg rate Status Health RAID #LUN RG name Page Logical Unit Example Select / Volume configuration / RAID group¾ Example Select / Volume configuration / Virtual disk Attach LUN to VD There are 2 methods to attach LUN to VD Select / Volume configuration / Physical disk / Volume configuration / Logical unitHave an error when deleting this RG Enclosure Management SES Configuration Hardware Monitor Hard Drive S.M.A.R.T. Function UPS Type Shutdown Battery Level Shutdown Delay s 4 UPSSystem Maintenance System InformationUpgrade Reset to DefaultConfig Import & Export Event Log Reboot and Shutdown LogoutAdvanced Operation RebuildWay mirror RAID 0+1RG Migration Page VD Extension Disk Roaming Support Microsoft Mpio and MC/SISCSI Initiator Software Certification ListVendor Model Software/Release NumberGbE Switch Vendor Model ISCSI HBA card Vendor ModelHard drive Vendor Model HW events Level Type Description Event NotificationsPD events Level Type Description š EMS events Level Type Descriptionš RMS events Level Type Description š LVM3 events Level Type DescriptionVD migration VD name completes migration Finished š iSCSI events Level Type Description š Battery backup events Level Type Descriptionš Jbod events Level Type Description Known Issues š System maintenance events Level Type DescriptionMicrosoft iSCSI Initiator Click DiscoveryClick Targets Page Click Details Installation Steps for Large Volume Over 2TB IntroductionPage Page Mpio and MC/S Setup Instructions Choose Round Robin in Load Balance Policy Enable Enable multi-path checkbox. Then click Advanced…Click Mpio tab, select Load Balance Policy to Round Robin System information ISCSI RAID Subsystem