RAID 1 Schemes | Apple NMB-003 specification

RAID 1 Schemes

You can use RAID 1 several ways on a four-drive system, depending on how you divide the drive modules between the RAID controllers and how you mirror the data on the drives. If all the modules are on one controller, you can have two RAID sets on one controller.

RAID 1

Appears

as

Mirror Mirror

Disk 1

Disk 2

If two modules are on each controller, you can create one RAID set on each side.

RAID 1

Appears

as

Mirror

Mirror

Disk 1

Disk 2

RAID 3 and 5 Schemes

You can conﬁgure the system using RAID 3 or 5 with or without a drive module designated as a hot spare. (A hot spare is a drive that remains ready to replace any other drive that fails. The RAID controller automatically rebuilds data from the failed drive on the hot spare.)

Planning RAID Storage for the Xserve RAID System

67

Image 67

Apple NMB-003 manual RAID 1 Schemes

Contents

User’s Guide Apple Computer, Inc. All rights reserved Apple Computer, Inc Contents Installing or Replacing Components Installing the SystemConnecting Xserve RAID to a Host System and a Network Using the Xserve RAID System RAID Overview Installing Xserve RAID Hardware and SoftwareConnecting a 14-Drive System to a Host Computer or Switch Data Storage Methods Appendix B Safety, Maintenance, and Ergonomics Glossary Appendix a Specifications About This Guide Page Introducing Xserve RAID Unpacking the System Introducing Xserve RAID Your System at a Glance-Front Panel Indicates temperature status green is OK, red is failure RAID Your System at a Glance-Back Panel Redundant, hot-swappable cooling module cools the system Your System at a Glance-Mounting Hardware Use this bar to fasten extenders C and D for a deep rack Page Use your leg muscles to lift Preparing to Install Xserve RAID in a RackGuidelines for Installation Precautions for Handling the System Choosing the System’s Location in the Rack Lift with a smooth motion don’t jerk the load up or down Rack Stability Electrical Power Security Operating Environment Mounting Xserve RAID in a Rack Getting Ready to Install the System Determine the Position for the System in the Rack Prepare the System for Installation Installing the SystemFollow the instructions in Unpacking the System on Assemble the Brackets and Extenders Two mounting screws for attaching the system to the rack Tighten the screws and then remove the template Repeat this procedure for the second bracket and extender Six short screws for assembling two brackets and extenders Secure each bolt with a washer Adjust the mounting Mounting Xserve RAID in a Rack Mount the System in the Rack Secure the System in the Rack or Cabinet Moving the Xserve RAID System System and a Network Connecting Xserve RAID to a Host System or Switch Installing the Host Bus Adapter Card in the Host SystemAbout Fibre Channel Connections and Cables Connecting the System to Xserve or a Power Mac G4 Connecting Xserve RAID to a Switch or Hub Removing Cables From the Xserve RAID and Host Systems Connecting to a Network Connecting Power to the System Plug one of the system’s power cords into the UPS Connecting an Uninterruptible Power SupplyFollow these steps to connect a UPS unit to the system Starting Up the System Using the Xserve RAID System Turning Off the System Using Status Lights and Other Indicators Light manually check If the System Has a Problem Follow these steps to install or replace a drive module Installing or Replacing an Apple Drive ModuleAbout Replacing Components Security lock Follow these steps to replace a power supply Replacing a Power Supply Replacing a Cooling Module Installing or Replacing Components Replacing a RAID Controller Module Installing or Replacing a Battery Module Obtaining Additional Replacement Components RAID Overview Setting Up the Xserve RAID SystemInstalling the system in a rack or cabinet Installing Xserve RAID Hardware and Software How RAID Works Connecting to an Ethernet networkAbout RAID Storage Scalability for expansion of storage Data Storage Methods RAID Levels RAID 0+1 requires a minimum of four drives RAID 5 requires a minimum of three drives RAID 3 requires a minimum of three drivesHardware and Software RAID What’s Next? Planning RAID Storage For the Xserve RAID System Tools for Configuring the Xserve RAID System RAID Controllers and Drive Modules Drive modules Controllers RAID RAID 0+1 Xserve RAID SchemesSystem With Four Drive Modules RAID 1 Schemes RAID 3 or RAID 0+1 and RAID 10 Schemes System With Seven Drive Modules RAID Disk Mirror Mirror Mirror Hot spare RAID 3 or 5 Hot spare RAID 3 or Disk System With 14 Drive Modules RAID 0+1 Disk Hot spare RAID 1 and RAID 3 or Disk Mirrors RAID1 Hot spare RAID RAID 30 and 50 Schemes Storage Capacities for Xserve RAID Schemes Xserve RAID Hardware Connections Connecting a 14-Drive System to a Host Computer or Switch Connecting a Four-Drive System to a Host Computer or Switch Common RAID Terms GlossaryPage Fibre Channel PCI Card Specifications RAID Controller SpecificationsSpeciﬁcations UPS Interface Specifications Apple Drive Module SpecificationsDimensions and Operating Environment Ethernet Specifications Pin D connector Cooling Module Specifications Power Supply SpecificationsBattery Module Optional Information Important Safety Information Safety, Maintenance, and Ergonomics Cleaning Your Equipment Power SupplyHandling Your System Safety, Maintenance, and Ergonomics Page Complies with European Directive 89/336/EEC