HP XP48 Owner's Manual download pdf (Page 102)

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102

HP SureStore E Disk Array XP512/XP48: Owner’s Guide

You will get more overall usable storage out of the array with a RAID5

implementation. RAID5 achieves the storage redundancy by generating

parity data based on the data stored. RAID5 only requires a 33% storage

overhead.

Table 15. RAID Array Usage and Overhead

RAID Type Disk Usage Overhead

RAID 0/1 2 disks + 2 disks 100%

RAID 5 3 disks + 1 parity drive 33%

1 2 ... 97 98 99 100 101 102 103 104 105 106 107 ... 123 124

Owner’s Guide 1
Warranty 2
Trademarks 2
Safety notices 2
Format conventions 2
CONTENTS 3
Software 65 5
5 Troubleshooting 77 5
6 Regulatory Statements 81 6
A Raid Technology 95 6
Glossary 107 6
Index 117 6
Revision History 7
ABOUT THE HP SURESTORE E DISK 9
ARRAY XP512 AND XP48 9
Continuous Data Availability 10
Connectivity 12
ESCON Connectivity 13
Data Integrity 14
Feature XP512 XP48 16
Websites 18
THE HP SURESTORE E DISK ARRAY 19
XP512 HARDWARE 19
General Safety Guidelines 20
Physical Components 22
Disk Control Frame 24
Service Processor 25
Disk Array Frames 26
Remote Console PC (optional) 27
Figure 4. XP512 Disk Array 28
Control Panel 30
Figure 5. Control Panel 31
UNIT EMERGENCY POWER OFF 35
EMERGENCY 36
POWER OFF 36
Normal Operations 37
Powering Off the Disk Array 38
Planned Power-Off 39
Specifications 42
Mechanical Vibration 43
AC Line Voltage 43
XP48 HARDWARE 45
Remote Console 50
XP48 Disk Array 50
Web-Based Console 66
Security 67
Core Solutions 68
Disaster Recovery 70
High Availability 71
Failover and Load Balancing 72
Performance Monitoring 73
Network Management 74
Mainframe Solutions 75
TROUBLESHOOTING 77
Monitoring and Reporting 78
Troubleshooting Flow Diagram 79
REGULATORY STATEMENTS 81
FCC EMC Statement (USA) 82
IEC Statement (Worldwide) 83
EMC Statement (Canada) 84
Regulatory Statements 85
VCCI EMC Statement (Japan) 86
Harmonics Conformance (Japan) 88
German Noise Declaration 89
Laser Safety 90
Declaration of Conformity 91
RAID TECHNOLOGY 95
Using RAID0/1 96
2D + 2D Array Group 97
ACP pair 97
Understanding RAID3 98
Using RAID5 99
3D + 1P Array Group 101
RAID Type Disk Usage Overhead 102
RAID Technology 103
RAID 0/1 104
GLOSSARY 107
Reader Comment Sheet 123
BUSINESS REPLY MAIL 124

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HP XP48 Owner's Manual Page 102

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