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13 Hard disk replacement
In this chapter:
•
“Replaceable parts” on page 113
•
“How do I know a disk has failed?” on page 113
• “Electrostatic discharge information ”onpage115
• “Replacing the hard disk” on page 115
Replaceable
parts
The only fun
ctional par ts that can be replaced i n the HP D2D Backup System B ackup System are the
hard disks. If the unit fails for any other reason than hard disk failure and it is still under warranty, a
replacement HP D 2D Backup System without hard disk drives may be supplied.
The HP D2D Ba
ckup System Backup System is a R AI D 5 configured device with four disks. No other RAID
configurati
ons are supported.
• HP D2D Backup System 110 has four 250 GB disks
• HP D2D Backup System 120 has four 500 GB disks
• HP D2D Back
up System 130 has four 750 GB disks
RAID 5
RAID 5, Distributed Data Guarding, offers the best combination of data protection and usable capacity.
RAID 5 stores parity data a cross all the physical drives in the array and allows more simultaneous read
operations and higher performance than data guarding (RAI D 4) . If a drive fails, the controller uses the
parity data and the data on the remaining drives to reconstruct data from the failed drive. The system
continues operating with a slightly reduced performance until you replace the failed drive. R A ID 5
requires an array with a minimum of three physical drives. For the HP D2D Ba ckup System, which has
four disks, 25 % of the total logical drive stora ge capacity is used for parity data.
This means that actual storage capacity is approximately:
• 2.25 TB for the HP D2D Backup System 130
• 1.5 TB for the HP D2 D Backup System 120
• 750 GB for the HP D2D Backup System 110
How do I
know a disk has failed?
The Status and Disk Status LEDs show amber, if a disk fails. Use the Web Management Interface to help
you identify the disk that has failed. The HP D2D Ba ckup System operates correctly with three disks, but
protection is limited. It is impor tant to replace the failed disk as soon as possible. Any subsequent disk
failu
re will result in complete data loss.
In the following Summary page example you can see that one disk has failed.
D2D Backup System
113
- HP StorageWorks 1
- D2D Backup System 1
- User Guide 1
- Contents 3
- About this guid e 11
- HP technical support 12
- Customer self r epair 12
- Product warranties 12
- Registering your tape drive 12
- Subscription service 13
- HP websites 13
- Documenta 13
- About this guide 14
- 1 B efore you s tart 15
- Terminology 16
- Host3Host2 Host4/5/6Host1 17
- Import/Export and Copy 18
- Storage capa 19
- Tape rotation strategies 20
- Before you start 22
- D2D Backu p System 23
- DHCP and static I 24
- Paddressing 24
- Optional Tape Attach 24
- Supplied 26
- Internet Explor 27
- Internet Explorer 6.X 27
- 3Attachingaphysicaltapedrive 29
- (option al) 29
- Installing the HBA 31
- 4TheInstallationwizard 39
- Run the Ins 40
- The Installation wizard 42
- 5 Advanced installation 45
- Microsoft iSCSI Initiator 46
- The iS CSI Initiator 47
- General tab 48
- Discovery tab 48
- Targets tab 49
- Persistent Targets tab 50
- Linux iSCSI initiator 51
- Manual driver installation 51
- HP LTO Tape driv 52
- Medium changer d river 52
- Understanding the LEDs 53
- Beacon mode 53
- Office backup 56
- Database server 57
- Desktop PC 58
- High-per 60
- Graphics 61
- Summar y (Home) 64
- Devices (Configuration) 65
- To edit device details 66
- To create a new device 66
- Cartridges (Configuration) 67
- The Web Management Interface 68
- Empty slots 69
- To remove a cartridge 69
- To write protect 70
- To edit maximum size 70
- To create a cartridge 70
- Network ( Configuration) 71
- Network configuration 72
- Email Alerts (Co 74
- Disk & RAID (Status) 76
- Physical disks 77
- Log (Status) 78
- Tape Attach pages 79
- Administration (Admin) 80
- Firmware (Admin) 81
- Support (Admin) 82
- Archiving methods 84
- WhyusetheCopyfunctionality? 85
- When would Copy be used? 85
- Cartr i dge export 86
- When would Export be used? 87
- Disadvantages of Export 87
- Cartridge import 88
- Tape spanning 88
- Configuration (Tape Attach) 89
- Status (T ape Attach) 94
- Schedule (Tape Attach) 95
- To create a schedule 96
- Job History (Tape Attach) 97
- 10 C o py using a tape drive 99
- Compression 100
- 11 Restore processes 101
- Restoring from 102
- Restore processes 104
- 12 Troubleshooting 105
- Troubleshooting 106
- Manual installation 108
- Device troubleshooting 109
- Cartridge troubleshooting 110
- Email alerts tro 112
- Disk troubleshooting 112
- 13 Hard disk replacement 113
- If m o re than one disk fails 114
- Replacing the hard disk 115
- Hard disk replacement 116
- System Board 118
- Replacing a complete unit 122
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