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86 Configuring and Managing RAID
When you define the virtual disks, you can set the following virtual disk
parameters:
•RAID level
• Stripe element size
•Read policy
•Write policy
• Type of initialization
• Hot spare configuration
NOTE: The default hard drive cache policy for a virtual disk composed with SAS
hard drives is
disabled
and with SATA hard drives is
enabled
. The Virtual Disk
parameter can not be changed in the BIOS configuration Utility.
Table 6-2 shows the parameters that you can configure when defining
virtual disks.
Table 6-2. Virtual Disk Parameters and Descriptions
Parameter Description
RAID Level RAID Level specifies whether the virtual disk is RAID 0, 1, 5, 6, 10,
50, or 60. The number of disks, disk capacity, the requirements for
fault tolerance, performance, and capacity should be considered when
selecting the RAID level. For more information, see "Summary of
RAID Levels" on page 17.
Stripe
Element Size
Stripe Element Size specifies the size of the segments written to each
physical disk in a RAID 0, 1, 5, 6, 10, 50, and 60 virtual disk. You can
set the stripe element size to 8 KB, 16 KB, 32 KB, 64 KB, 128 KB,
256 KB, 512 KB, or 1024 KB. The default and recommended stripe
element size is 64 KB.
A larger stripe element size provides better read performance if your
system mostly does sequential reads.
PERC7.2_UG.book Page 86 Thursday, March 3, 2011 2:14 PM
- User’s Guide 1
- Notes, Cautions, and Warnings 2
- Contents 3
- 4 Contents 4
- 6 Contents 6
- 8 Contents 8
- B Corporate Contact Details 9
- 10 Contents 10
- Safety Instructions 11
- Battery Disposal 13
- 14 Safety Instructions 14
- Overview 15
- Operating System Support 16
- RAID Description 17
- RAID Terminology 18
- Disk Mirroring 19
- Spanned RAID Levels 19
- Parity Data 19
- Storage Controller Features 21
- Using the SMART Feature 24
- Initializing Virtual Disks 25
- Consistency Checks 26
- Disk Roaming 26
- Disk Migration 27
- Write-Back and Write-Through 29
- Employed 30
- Reconfiguring Virtual Disks 31
- Fault Tolerance Features 33
- Physical Disk Hot Swapping 34
- Controller Cache Preservation 36
- Cache Data Recovery 37
- Patrol Read 38
- Installing and Configuring 41
- Hardware 41
- Owner's Manual 42
- Hardware Owner’s Manual 46
- Card in Dell Blade Systems 49
- Hardware Owner's 51
- 1 DIMM 2 DIMM support 54
- DIMM of a PERC H800 Adapter 60
- H800 Cards 63
- PERC H800 Adapter 64
- Driver Installation 69
- Pre-Installation Requirements 70
- Installation 71
- R2 Installation 72
- Windows Server 2003 73
- Installing Linux Driver 74
- Update Diskette 77
- <package name> 78
- Installing Solaris Driver 79
- BIOS Configuration Utility 82
- Menu Navigation Controls 83
- Setting Up Virtual Disks 85
- Virtual Disk Management 88
- Checking Data Consistency 91
- Configuration View Screen 93
- Managing Preserved Cache 96
- Managing Dedicated Hot Spares 97
- Deleting Virtual Disks 98
- Deleting Disk Groups 98
- Clearing the Configuration 99
- (continued) 101
- Management" on page 88 104
- Physical Disk Actions 106
- Controller Management Actions 107
- Physical Disk Management 108
- Creating Global Hot Spares 109
- Restrictions and Limitations 111
- Controller Management 112
- Enabling BIOS Stop on Error 113
- Enabling Auto Import 113
- Configuring and Managing RAID 114
- CacheCade 115
- Create CacheCade Virtual Disk 116
- CacheCade 117 117
- Delete CacheCade Virtual Disk 118
- 120 CacheCade 120
- Security Key and RAID 121
- Management 121
- Security Key Management 122
- Change Key 124
- Delete Key 125
- Migration 126
- Instant Secure Erase 128
- Secured Foreign Import Errors 128
- Troubleshooting 131
- 132 Troubleshooting 132
- 134 Troubleshooting 134
- <Ctrl><R> 134
- 136 Troubleshooting 136
- 138 Troubleshooting 138
- CAUTION: The 138
- CAUTION: MBE 139
- NOTE: A similar 139
- 140 Troubleshooting 140
- NOTE: This message may 140
- Memory Errors 141
- Preserved Cache State 142
- General Issues 142
- Physical Disk Related Issues 143
- 144 Troubleshooting 144
- SMART Errors 146
- Replace Member Errors 147
- Linux Operating System Errors 148
- 150 Troubleshooting 150
- Disk Carrier LED Indicators 151
- 152 Troubleshooting 152
- Regulatory Notices 153
- 154 Regulatory Notices 154
- Glossary 157
- Glossary 159 159
- Glossary 161 161
- Glossary 163 163
- Glossary 165 165
- Glossary 167 167
- RAID Level Migration 168
- RAID Management Utility 168
- Read-Ahead 168
- Rebuild Rate 168
- Glossary 169 169
- Glossary 171 171
- Glossary 173 173
- Write-Through 174
- Index 175 175
- Index 177 177
- 178 Index 178
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