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
178 Modular SAN Array 1000 User Guide
Figure 66: Data Striping and Drive Mirroring
Advantages
■ Highest read and write performance of any fault-tolerant configuration
■ No loss of data as long as no failed drive is mirrored to another failed drive
(up to half of the physical drives in the array can fail)
Disadvantages
■ Expensive (many drives needed for fault tolerance)
■ Only half of total drive capacity usable for data storage
S1
S2
S1
S2
P1
P5
B5
B1
B1
B5
P2
P6
B6
B2
B2
B6
P3
P7
B7
B3
B3
B7
P4
P8
B8
B4
B4
B8
230941-005_MSA1000_UG.book Page 178 Thursday, April 17, 2003 5:53 PM