Dell PowerEdge T320 Owner's Manual - Page 72

Memory Optimized (Independent Channel) Mode, Memory Sparing, Memory Mirroring

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Memory sockets A1 and A4 are disabled and you can populate DIMMs in memory sockets A2, A3, A5, and A6. NOTE: Advanced ECC with Mirroring is not supported. Memory Optimized (Independent Channel) Mode This mode supports SDDC only for memory modules that use x4 device width and does not impose any specific slot population requirements. Memory Sparing NOTE: To use memory sparing, this feature must be enabled in the System Setup. In this mode, one rank per channel is reserved as a spare. If persistent correctable errors are detected on a rank, the data from this rank is copied to the spare rank and the failed rank is disabled. With memory sparing enabled, the system memory available to the operating system is reduced by one rank per channel. For example, in a system with three 8 GB dual-rank DIMMs, the available system memory is: 1/2 (ranks/ channel) × 3 (DIMMs) × 8 GB = 12 GB, and not 3 (DIMMs) × 8 GB = 24 GB. NOTE: Memory sparing does not offer protection against a multi-bit uncorrectable error. NOTE: Both Advanced ECC/Lockstep and Optimizer modes support Memory Sparing. 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: • Memory sockets A1 and A4 are disabled and you can populate DIMMs in memory sockets A2, A3, A5, and A6. • 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 table shows sample memory configurations for a single processor configuration that follow the appropriate memory guidelines stated in this section. NOTE: 16 GB quad-rank RDIMMs are not supported. NOTE: 1R and 2R in the following tables indicate single- and dual-rank DIMMs respectively. Table 1. Memory Configurations System Capacity (in DIMM Size (in GB) GB) 2 2 Number of DIMMs 1 DIMM Rank, Organization, and Frequency 1R, x8, 1333 MT/s, DIMM Slot Population A1 4 2 1R, x8, 1600 MT/s 2 1R, x8, 1333 MT/s, A1, A2 1R, x8, 1600 MT/s 72

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Memory sockets A1 and A4 are disabled and you can populate DIMMs in memory sockets A2, A3, A5, and A6.
NOTE:
Advanced ECC with Mirroring is not supported.
Memory Optimized (Independent Channel) Mode
This mode supports SDDC only for memory modules that use x4 device width and does not impose any specific slot
population requirements.
Memory Sparing
NOTE:
To use memory sparing, this feature must be enabled in the System Setup.
In this mode, one rank per channel is reserved as a spare. If persistent correctable errors are detected on a rank, the
data from this rank is copied to the spare rank and the failed rank is disabled.
With memory sparing enabled, the system memory available to the operating system is reduced by one rank per
channel. For example, in a system with three 8 GB dual-rank DIMMs, the available system memory is: 1/2 (ranks/
channel) × 3 (DIMMs) × 8 GB = 12 GB, and not 3 (DIMMs) × 8 GB = 24 GB.
NOTE:
Memory sparing does not offer protection against a multi-bit uncorrectable error.
NOTE:
Both Advanced ECC/Lockstep and Optimizer modes support Memory Sparing.
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:
•
Memory sockets A1 and A4 are disabled and you can populate DIMMs in memory sockets A2, A3, A5, and A6.
•
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 table shows sample memory configurations for a single processor configuration that follow the
appropriate memory guidelines stated in this section.
NOTE:
16 GB quad-rank RDIMMs are not supported.
NOTE:
1R and 2R in the following tables indicate single- and dual-rank DIMMs respectively.
Table 1. Memory Configurations
System Capacity (in
GB)
DIMM Size (in GB)
Number of DIMMs
DIMM Rank,
Organization, and
Frequency
DIMM Slot Population
2
2
1
1R, x8, 1333 MT/s,
A1
1R, x8, 1600 MT/s
4
2
2
1R, x8, 1333 MT/s,
A1, A2
1R, x8, 1600 MT/s
72