Logic MegaRAID Express User's Guide
Table Of Contents
- 1 Overview
- 2 Introduction to RAID
- 3 RAID Levels
- 4 Features
- 5 Configuring MegaRAID Express 500
- 6 Hardware Installation
- Checklist
- Installation Steps
- Summary
- 7 Cluster Installation and Configuration
- Software Requirements
- Hardware Requirements
- Installation and Configuration
- Driver Installation Instructions under Microsoft Windows 2000 Advanced Server
- Network Requirements
- Shared Disk Requirements
- Cluster Installation
- Installing the Windows 2000 Operating System
- Setting Up Networks
- Configuring the Cluster Node Network Adapter
- Configuring the Public Network Adapter
- Verifying Connectivity and Name Resolution
- Verifying Domain Membership
- Setting Up a Cluster User Account
- Setting Up Shared Disks
- Configuring Shared Disks
- Assigning Drive Letters
- Verifying Disk Access and Functionality
- Cluster Service Software Installation
- Configuring Cluster Disks
- Validating the Cluster Installation
- Configuring the Second Node
- Verify Installation
- SCSI Drive Installations
- Configuring the SCSI Devices
- Terminating the Shared SCSI Bus
- 8 Troubleshooting
- A SCSI Cables and Connectors
- B Audible Warnings
- C Cluster Configuration with a Crossover Cable
- Glossary
- Index
Chapter 2 Introduction to RAID
13
Disk Mirroring
With mirroring (used in RAID 1), data written to one disk drive is simultaneously written
to another disk drive. If one disk drive fails, the contents of the other disk drive can be
used to run the system and reconstruct the failed drive. The primary advantage of disk
mirroring is that it provides 100% data redundancy. Since the contents of the disk drive
are completely written to a second drive, it does not matter if one of the drives fails. Both
drives contain the same data at all times. Either drive can act as the operational drive.
Disk mirroring provides 100% redundancy, but is expensive because each drive in the
system must be duplicated.