Dell PowerEdge RAID Controller 6i Bedienungsanleitung Seite 125
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Troubleshooting 125
Linux Operating System Errors
Table 7-8 describes issues related to the Linux operating system.
Table 7-8. Linux Operating System Errors
Error Message Suggested Solution
<Date:Time> <HostName>
kernel: sdb: asking for
cache data failed
<Date:Time> <HostName>
kernel: sdb: assuming
drive cache: write
through
This error message displays when the Linux
Small Computer System Interface (SCSI)
mid-layer asks for physical disk cache settings.
Because the controller firmware manages the
virtual disk cache settings on a per controller
and a per virtual disk basis, the firmware does
not respond to this command. Thus, the Linux
SCSI mid-layer assumes that the virtual disk's
cache policy is Write-Through. SDB is the device
node for a virtual disk. This value changes for
each virtual disk.
See the section "Physical Disk Management" on
page 104 for more information about Write-
Through cache.
Except for this message, there is no side effect to
this behavior. The cache policy of the virtual
disk and the I/O throughput are not affected by
this message. The cache policy settings for the
PERC6 SAS RAID system remain the settings
you have already chosen.
Dell_PERC6.1_UG.book Page 125 Wednesday, April 15, 2009 4:18 PM
- User’s Guide 1
- Notes, Notices, and Cautions 2
- Contents 3
- 4 Contents 4
- 6 Contents 6
- 8 Contents 8
- C Corporate Contact Details 9
- (Taiwan Only) 9
- 10 Contents 10
- CAUTION: Safety Instructions 11
- SAFETY: General 12
- SAFETY: Battery Disposal 13
- 14 SAFETY: General 14
- Overview 15
- Operating System Support 16
- RAID Description 17
- RAID Terminology 18
- Spanned RAID Levels 19
- Parity Data 19
- 20 Overview 20
- About PERC 6 and CERC 6i 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 Warranty Information 31
- Battery Learn Cycle 31
- Write-Back and Write-Through 32
- Virtual Disk Read Policies 33
- Reconfiguring Virtual Disks 34
- Fault Tolerance Features 36
- Patrol Read Modes 39
- Installaing and Configuring 41
- Hardware 41
- Unit (TBBU) for PERC 6/E 45
- PERC 6/E Adapter 56
- Installing the Drivers 63
- Installing Windows Driver 64
- Installing the Drivers 65 65
- Operating System Installation 66
- Installation 66
- Installing Linux Driver 69
- Update Diskette 71
- Diskette 71
- Upgrading the Kernel 72
- Installing Solaris Driver 73
- CERC 6i Controller 74
- Installing NetWare Driver 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 100
- Foreign Configuration View 103
- Physical Disk Management 104
- Restrictions and Limitations 107
- Controller Management 108
- Enabling BIOS Stop on Error 109
- Configuring and Managing RAID 110
- Troubleshooting 111
- 114 Troubleshooting 114
- 116 Troubleshooting 116
- Virtual Disks Degraded 117
- Memory Errors 118
- Pinned Cache State 118
- General Problems 119
- Physical Disk Related Issues 120
- 122 Troubleshooting 122
- SMART Errors 123
- Replace Member Errors 124
- Linux Operating System Errors 125
- 126 Troubleshooting 126
- Controller LED Indicators 127
- Drive Carrier LED Indicators 128
- 130 Troubleshooting 130
- Regulatory Notices 131
- 132 Regulatory Notices 132
- Regulatory Notices 133 133
- 134 Regulatory Notices 134
- Glossary 135
- Battery Backup Unit (BBU) 136
- BIOS Configuration Utility 136
- Glossary 137 137
- Glossary 139 139
- Glossary 141 141
- Glossary 143 143
- Partition 145
- Patrol Read 145
- Physical Disk 145
- Physical Disk States 146
- Protocol 146
- RAID Level Migration 147
- RAID Levels 147
- RAID Management Utility 147
- Glossary 149 149
- SCSIport 150
- Single Bit ECC Errors 150
- Glossary 151 151
- Index 153 153
- Index 155 155
- Index 156 156
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