Hp ProLiant DL160 G5 Storage-Server User Manual Page 56
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Fault tolerance
Drive failure, although rare, is potentially catastrophic. For example, using simple striping as shown
in Figure 17, failure of any hard drive leads to failure of all logical drives in the same array, and
hence to data loss.
To protect against data loss from hard drive failure, storage servers should be configured with fault
tolerance. HP recommends adhering to RAID 5 configurations.
The table below summarizes the important features of the different kinds of RAID supported by the
Smart Array controllers. The decision chart in the following table can help determine which option is
best for different situations.
Table 19 Summary of RAID methods
RAID 6 (ADG)
RAID 5
Distributed
Data Guarding
RAID 1+0
Mirroring
RAID 0
Striping (no
fault tolerance)
Storage system dependent14N/AN/A
Maximum number of hard
drives
YesYesYesNo
Tolerant of single hard
drive failure?
Yes (two drives can fail)No
If the failed
drives are not
mirrored to
each other
No
Tolerant of multiple
simultaneous hard drive
failures?
Online spares
Further protection against data loss can be achieved by assigning an online spare (or hot spare) to
any configuration except RAID 0. This hard drive contains no data and is contained within the same
storage subsystem as the other drives in the array. When a hard drive in the array fails, the controller
can then automatically rebuild information that was originally on the failed drive onto the online spare.
This quickly restores the system to full RAID level fault tolerance protection. However, unless RAID
Advanced Data Guarding (ADG) is being used, which can support two drive failures in an array, in
the unlikely event that a third drive in the array should fail while data is being rewritten to the spare,
the logical drive still fails.
Logical storage elements
Logical storage elements consist of those components that translate the physical storage elements to
file system elements. The storage server uses the Window Disk Management utility to manage the
various types of disks presented to the file system. There are two types of LUN presentation: basic
disk and dynamic disk. Each of these types of disk has special features that enable different types of
management.
Logical drives (LUNs)
While an array is a physical grouping of hard drives, a logical drive consists of components that
translate physical storage elements into file system elements.
Storage management overview56
- HP ProLiant Storage Server 1
- Contents 3
- About this guide 13
- Rack stability 14
- HP technical support 15
- Customer self repair 15
- Product warranties 15
- Subscription service 15
- HP websites 16
- Documentation feedback 16
- Setup overview 17
- Installing the server 19
- Checking kit contents 20
- Powering on the server 20
- Factory image 20
- Physical configuration 21
- Default boot sequence 22
- Logging off and disconnecting 27
- Telnet Server 27
- Before you begin 30
- Configuration Worksheet 31
- HP ProLiant Storage Server 31 31
- 2 Server components 35
- StatusDescriptionItem 36
- DescriptionItem 36
- Figure 5 ML110 G5 rear panel 37
- HP ProLiant Storage Server 37 37
- DL160 G5 hardware components 38
- Figure 7 DL160 G5 rear panel 39
- HP ProLiant Storage Server 39 39
- DL185 G5 hardware components 40
- Figure 9 DL185 G5 rear panel 41
- HP ProLiant Storage Server 41 41
- DL380 G5 hardware components 42
- HP ProLiant Storage Server 43 43
- Figure 11 DL380 G5 rear panel 44
- DL585 G2 hardware components 45
- Figure 13 DL585 G2 rear panel 47
- HP ProLiant Storage Server 47 47
- SAS and SATA hard drive LEDs 48
- Server components52 52
- 3 Storage management overview 53
- Physical storage elements 54
- Logical storage elements 56
- Partitions 57
- File system elements 58
- File sharing elements 58
- Network adapter teaming 59
- Management tools 59
- Management Agents 60
- 4 File server management 61
- File services management 62
- Storage management utilities 63
- Array Configuration Utility 64
- Scheduling defragmentation 65
- Disk quotas 66
- Adding storage 67
- File server management68 68
- Volume shadow copies 69
- Allocating disk space 70
- Identifying the storage area 71
- Mounted drives 72
- Managing shadow copies 72
- The shadow copy cache file 73
- File server management74 74
- Set schedules 75
- Disabling shadow copies 76
- SMB shadow copies 78
- NFS shadow copies 79
- Recovery of files or folders 80
- Recovering a folder 81
- Shadow Copy Transport 82
- Folder and share management 83
- File server management84 84
- File server management86 86
- File server management88 88
- Share management 89
- Defining Access Control Lists 90
- File Server Resource Manager 91
- File screening management 92
- Storage reports 92
- Antivirus 93
- Security 93
- More information 93
- File server management94 94
- 5 Print services 95
- Print services management 96
- Print queue creation 97
- Driver updates 98
- Best practices 99
- Troubleshooting 100
- MSNFS Features 101
- MSNFS use scenarios 102
- Administering MSNFS 103
- Server for NFS 103
- User Name Mapping 108
- Print services for UNIX 110
- Adding local NetWare users 116
- Managing NCP volumes (shares) 117
- Print Services for NetWare 118
- Additional resources 119
- Print services for Macintosh 120
- 8 Enterprise storage servers 121
- Virtual disk storage 122
- Snapshots 122
- Create iSCSI Target Wizard 123
- Create Virtual Disk Wizard 124
- Import Virtual Disk Wizard 125
- Extend Virtual Disk Wizard 125
- Schedule Snapshot Wizard 125
- Hardware provider 126
- Cluster support 126
- 9 Cluster administration 127
- Cluster terms and components 128
- Cluster groups 129
- Virtual servers 129
- Failover and failback 129
- Quorum disk 129
- Cluster concepts 130
- Cluster planning 131
- Storage planning 132
- Network planning 132
- Protocol planning 133
- Before beginning installation 134
- Network requirements 135
- Cluster installation 136
- Setting up networks 137
- Verifying domain membership 138
- Setting up a cluster account 138
- About the Quorum disk 138
- Configuring shared disks 138
- Using Cluster Administrator 139
- Creating a cluster 139
- Adding nodes to a cluster 139
- Cluster group overview 140
- Load balancing 141
- Resource planning 141
- NFS cluster-specific issues 142
- Shadow copies in a cluster 143
- Extend a LUN in a cluster 144
- Print services in a cluster 145
- Failing over and failing back 146
- Restarting one cluster node 146
- Powering down the cluster 147
- Powering up the cluster 147
- Cluster administration148 148
- Maintenance and service 150
- Certificate of Authenticity 151
- 11 System recovery 153
- System recovery154 154
- Class A equipment 157
- Class B equipment 157
- Laser compliance 158
- European Union notice 159
- BSMI notice 160
- Japanese notice 160
- Korean notice A&B 160
- Battery replacement notice 161
- Power cords 161
- Japanese power cord notice 162
- Electrostatic discharge 162
- Czechoslovakian notice 162
- Danish notice 163
- Dutch notice 163
- English notice 163
- Estonian notice 164
- Finnish notice 164
- French notice 164
- German notice 164
- Greek notice 165
- Hungarian notice 165
- Italian notice 165
- Latvian notice 165
- Lithuanian notice 166
- Polish notice 166
- Portuguese notice 166
- Slovakian notice 167
- Slovenian notice 167
- Spanish notice 167
- Swedish notice 167
- Index170 170
- Index172 172
- Index174 174
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