User guide
Table Of Contents
- MSA1000 User Guide
- Contents
- About this Guide
- Chapter 1: Introduction
- Chapter 2: Operating System Specific Information
- Chapter 3: MSA1000 Setup and Sample Configurations
- Chapter 4: Operation and Management
- Chapter 5: Array Configuration Utility (ACU)
- Installing the ACU on the Server
- Accessing the ACU
- Description of Screen Regions
- Configuring a New Controller
- Modifying an Existing Controller
- Probability of Logical Drive Failure
- Chapter 6: Command Line Interface (CLI)
- CLI Overview
- CLI Setup
- Help Commands
- Display Commands
- Array Controller Configuration Commands
- LUN Management Commands
- Server Connection Commands
- Selective Storage Presentation/Access Control List Commands
- Appendix A: Regulatory Compliance Notices
- Appendix B: Electrostatic Discharge
- Appendix C: Specifications
- Appendix D: Hard Drive Arrays
- Appendix E: Recovering from Hard Drive Failure
- Appendix F: Controller Display Messages
- Appendix G: Recovery ROM and ROM Cloning
- Appendix H: SCSI ID Assignments
- Index
Hard Drive Arrays
176 Modular SAN Array 1000 User Guide
Fault-Tolerance Methods
RAID 0—No Fault Tolerance
This configuration (refer to Figure 63) provides no protection against data loss
when a drive fails. However, it is useful for rapid storage of large amounts of
non-critical data (for printing or image editing, for example) or when cost is the
most important consideration.
Advantages
■ Highest performance method for writes
■ Lowest cost per unit of data stored
■ All drive capacity is used to store data (none needed for fault tolerance)
Disadvantages
■ All data on the logical drive is lost if a physical drive fails
■ Cannot use an online spare
■ Can only preserve data by backing it up to external drives
230941-005_MSA1000_UG.book Page 176 Thursday, April 17, 2003 5:53 PM