User's Manual

Contents
HP Smart Array 641/642 Controller User Guide v
HP CONFIDENTIAL
Writer: John Turner File Name: a-frnt
Codename: darkmatter - antimatter Part Number: 309311-001 Last Saved On: 11/7/02 5:12 PM
European Union Notice .................................................................................................. A-4
Japanese Notice ..............................................................................................................A-5
Taiwanese Notice............................................................................................................ A-5
Battery Replacement Notice ........................................................................................... A-6
Appendix B
Electrostatic Discharge
Appendix C
Controller Specifications
Appendix D
Drive Arrays and Fault Tolerance
What Is a Drive Array?................................................................................................... D-1
Fault-Tolerance Methods................................................................................................ D-5
RAID 0—No Fault Tolerance.................................................................................. D-5
RAID 1+0—Drive Mirroring................................................................................... D-6
RAID 5—Distributed Data Guarding....................................................................... D-7
RAID ADG—Advanced Data Guarding.................................................................. D-9
Comparison of RAID Methods .............................................................................. D-10
Other Fault-Tolerance Options............................................................................... D-11
Appendix E
Hard Drive Installation and Replacement
General Information About Hard Drive Failure ............................................................. E-1
Recognizing Drive Failure ....................................................................................... E-2
Compromised Fault Tolerance................................................................................. E-4
Automatic Data Recovery ........................................................................................ E-5
General Aspects of Drive Replacement.......................................................................... E-6
Drive Failure During Rebuild .................................................................................. E-8
Moving Drives and Arrays ............................................................................................. E-9
Upgrading Hard Drive Capacity ............................................................................ E-10
Expanding and Extending Capacity ....................................................................... E-11