Dell T420 Owner's Manual Page 75
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- TROUBLESHOOTING
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Memory Mirroring
Memory Mirroring offers the strongest DIMM reliability mode compared to all other modes, providing improved
uncorrectable multi-bit failure protection. In a mirrored configuration, the total available system memory is one half of
the total installed physical memory. Half of the installed memory is used to mirror the active DIMMs. In the event of an
uncorrectable error, the system will switch over to the mirrored copy. This ensures SDDC and multi-bit protection.
Memory installation guidelines:
NOTE: The first memory channel for each processor (Channel 1) is disabled and not available for Memory
Mirroring.
• Memory channels 2 and 3 must be populated.
• Memory modules must be identical in size, speed, and technology.
• DIMMs installed in memory sockets with white release tabs must be identical and similar rule applies for sockets
with black release tabs. For example, DIMMs installed in sockets A2 and A3 must be identical.
Sample Memory Configurations
The following tables show sample memory configurations that follow the appropriate memory guidelines stated in this
section.
NOTE: 16 GB quad-rank RDIMMs are not supported.
NOTE: 1R, 2R, and 4R in the following tables indicate single-, dual-, and quad-rank DIMMs respectively.
Table 1. Memory Configurations — Single Processor
System Capacity
(in GB)
DIMM Size (in
GB)
Number of
DIMMs
Organization and
Speed
DIMM Slot Population
2 2 1
1R x8, 1333 MT/s
1R x8, 1600 MT/s
A1
4 2 2
1R x8, 1333 MT/s
1R x8, 1600 MT/s
A1, A2
10 2 5
1R x8, 1333 MT/s
1R x8, 1600 MT/s
A1, A2, A3, A4, A5
12 4 3
1R x8, 1333 MT/s
1R x8, 1600 MT/s
A1, A2, A3
20 4 5
1R x8, 1333 MT/s
1R x8, 1600 MT/s
A1, A2, A3, A4, A5
24 8 3
2R x4, 1333 MT/s
2R x4, 1600 MT/s
A1, A2, A3
32 8 4
2R x4, 1333 MT/s
2R x4, 1600 MT/s
A1, A2, A3, A4
48 16 3
2R x4, 1333 MT/s
2R x4, 1600 MT/s
A1, A2, A3
96 16 6
2R x4, 1333 MT/s
2R x4, 1600 MT/s
A1, A2, A3, A4, A5, A6
128 32 4
4R x4, 1066 MT/s
A1, A2, A3, A4
75
- Dell PowerEdge T420 Systems 1
- Owner's Manual 1
- Notes, Cautions, and Warnings 2
- Contents 3
- About Your System 9
- LCD Panel Features 15
- Home Screen 16
- Setup Menu 16
- Diagnostic Indicators 17
- Hard-Drive Indicator Patterns 19
- NIC Indicator Codes 22
- Getting Started Guide 24
- Choosing The System Boot Mode 25
- Entering System Setup 26
- System Setup Options 27
- Memory Settings Screen 28
- Processor Settings Screen 28
- SATA Settings Screen 30
- Boot Settings Screen 30
- Integrated Devices Screen 31
- Serial Communications Screen 31
- System Security Screen 33
- Miscellaneous Settings 34
- Boot Manager Screen 37
- Embedded System Management 38
- 4. Click Back → Finish → Yes 39
- Installing System Components 41
- System Feet—Tower Mode 42
- Removing The System Feet 43
- Installing The System Feet 43
- Removing The Wheel Assembly 44
- Installing The Wheel Assembly 45
- Opening The System 45
- Inside The System 46
- 1. optical drive 50
- 2. tape drive 50
- 3. release latch 50
- Cooling Shroud 52
- Installing The Cooling Shroud 53
- Hard Drives—Hot-Swappable 54
- Hard Drives—Cabled 59
- Removing A Cabled Hard Drive 61
- Hard-Drive Backplane 63
- 1. x8 hard-drive backplane 64
- 2. release pin 64
- 3. hooks (11) 64
- 1. x16 hard-drive backplane 67
- 3. hooks (7) 67
- Four-Slot Hard-Drive Blank 70
- System Memory 71
- Mode-Specific Guidelines 74
- Sample Memory Configurations 75
- Removing Memory Modules 76
- Installing Memory Modules 78
- Cooling Fans 79
- PCIe Card Holder (Optional) 85
- Expansion Cards 86
- Removing An Expansion Card 87
- Installing An Expansion Card 88
- Removing A GPU Card 89
- Installing A GPU Card 90
- Removing The iDRAC Ports Card 91
- Internal Dual SD Module 93
- Internal SD Card 95
- Processors 96
- Installing A Processor 98
- Redundant AC Power Supply 99
- Non-Redundant AC Power Supply 103
- System Battery 107
- Control-Panel Assembly 108
- Removing The Control Panel 112
- Installing The Control Panel 114
- Removing The LCD Module 117
- Installing The LCD Module 118
- System Board 120
- Installing The System Board 121
- Rack Mode 123
- Rack Installation 125
- Troubleshooting Your System 127
- Troubleshooting A NIC 128
- Troubleshooting A Wet System 129
- Troubleshooting Cooling Fans 131
- Troubleshooting System Memory 131
- Troubleshooting An SD Card 133
- Troubleshooting A Hard Drive 134
- Troubleshooting Processor 135
- Using System Diagnostics 137
- System Diagnostic Controls 138
- Jumpers And Connectors 139
- Technical Specifications 143
- System Messages 149
- Warning Messages 165
- Diagnostic Messages 165
- Alert Messages 165
- Getting Help 167
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