Dell PowerEdge Expandable RAID Controller 3 User's Guide Page 154
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154 Glossary
SSP
Acronym for Serial SCSI Protocol. SSP enables communication with other SAS
devices.
Each PHY on the SAS controller can function as an SSP initiator or
SSP target.
Storport
The Storport driver has been designed to replace SCSIport and work with
Windows 2003 and beyond. In addition, it offers better performance for RAID
controller newer protocols (like SAS), providing higher I/O throughput rates,
improved manageability, and an upgraded miniport interface. For example,
while SCSIport allows a maximum of 254 commands per controller, Storport
allows 254 command per logical unit number (LUN).
STP
Acronym for Serial Tunneling Protocol, STP, enables communication with a
SATA device through an attached expander.
Each PHY on the SAS controller
can function as an STP initiator.
Stripe Element
A stripe element is the portion of a stripe that resides on a single physical disk.
See also
striping
.
Stripe Element Size
The total disk space consumed by a stripe not including a parity disk. For
example, consider a stripe that contains 64 KB of disk space and has 16 KB of
data residing on each disk in the stripe. In this case, the stripe element size is
16 KB and the stripe size is 64 KB.
Striping
Disk striping writes data across all physical disks in a virtual disk. Each stripe consists
of consecutive virtual disk data addresses that are mapped in fixed-size units to each
physical disk in the virtual disk using a sequential pattern. For example, if the virtual
disk includes five physical disks, the stripe writes data to physical disks one through
five without repeating any of the physical disks. The amount of space consumed by
a stripe is the same on each physical disk. The portion of a stripe that resides on a
physical disk is a
stripe element
. Striping by itself does not provide data redundancy.
Striping in combination with parity does provide data redundancy.
Dell_PERC6.2_UG.book Page 154 Wednesday, June 24, 2009 6:08 PM
- User’s Guide 1
- Notes, Cautions, and Warnings 2
- Contents 3
- 4 Contents 4
- 6 Contents 6
- 8 Contents 8
- Contents 9 9
- 10 Contents 10
- WARNING: Safety Instructions 11
- SAFETY: Battery Disposal 14
- Overview 15
- Operating System Support 16
- RAID Description 16
- Summary of RAID Levels 17
- RAID Terminology 17
- Disk Mirroring 18
- Spanned RAID Levels 19
- Parity Data 19
- 20 Overview 20
- About PERC 6 and CERC 6/i 21
- Controllers 21
- Using the SMART Feature 24
- Initializing Virtual Disks 25
- Consistency Checks 26
- Disk Roaming 27
- Disk Migration 27
- Battery Management 30
- Battery Learn Cycle 31
- Write-Back and Write-Through 32
- Virtual Disk Read Policies 33
- Reconfiguring Virtual Disks 33
- Fault Tolerance Features 36
- Patrol Read 38
- Patrol Read Modes 39
- Installing and Configuring 41
- Hardware 41
- Unit (TBBU) on PERC 6/E 46
- PERC 6/E Adapter 55
- Procedure) 59
- Driver Installation 63
- Installing Windows Drivers 64
- Operating System Installation 65
- Installation 66
- Installing Linux Driver 69
- Update Diskette 71
- Upgrading the Kernel 73
- Installing Solaris Driver 74
- Installing NetWare Drivers 75
- RAID Configuration Functions 78
- Menu Navigation Controls 80
- Setting Up Virtual Disks 83
- Virtual Disk Management 85
- Checking Data Consistency 88
- Configuration View Screen 90
- Managing Preserved Cache 93
- Managing Dedicated Hot Spares 94
- Deleting Virtual Disks 95
- Deleting Disk Groups 95
- Resetting the Configuration 96
- Virtual Disk Actions 101
- Foreign Configuration View 104
- Physical Disk Management 105
- Configuring and Managing RAID 106
- Restrictions and Limitations 108
- Controller Management 109
- Enabling BIOS Stop on Error 110
- Troubleshooting 113
- 114 Troubleshooting 114
- 116 Troubleshooting 116
- 118 Troubleshooting 118
- X. Perform a rescan after 118
- Virtual Disks Degraded 119
- Memory Errors 120
- Pinned Cache State 120
- General Problems 121
- Physical Disk Related Issues 122
- 124 Troubleshooting 124
- SMART Errors 125
- Replace Member Errors 126
- Linux Operating System Errors 127
- 128 Troubleshooting 128
- Controller LED Indicators 129
- Drive Carrier LED Indicators 130
- 132 Troubleshooting 132
- Regulatory Notices 133
- 134 Regulatory Notices 134
- Dell B.V. Taiwan Branch 135
- Tai p e i , Tai w a n 135
- Glossary 137
- Battery Backup Unit (BBU) 138
- BIOS Configuration Utility 138
- Glossary 139 139
- Glossary 141 141
- Glossary 143 143
- Initialization 144
- Inter-IC 144
- Load-balancing 144
- Glossary 145 145
- Glossary 147 147
- Physical Disk 148
- Physical Disk States 148
- Glossary 149 149
- Read-Ahead 150
- Rebuild Rate 150
- Reconstruct 150
- Redundancy 150
- Redundant Virtual Disk 151
- Replace Member 151
- Replacement Disk 151
- Replacement Unit 151
- Revertible Hot Spare 151
- Spanning 153
- Virtual Disk 155
- Write-Back 155
- Write-Through 155
- 156 Glossary 156
- Index 157 157
- Index 159 159
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