Memory Ras - HP ProLiant DL580 User Manual

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The largest contributor to maximum memory bandwidth performance is to use both memory controllers
inside the processor. To achieve maximum memory bandwidth performance, populate both memory
cartridges for each installed processor.
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The second largest contributor to performance is to populate each DDR3 channel in each memory
cartridge. To achieve this, the minimum DIMM count per cartridge is four DIMMs installed in DIMM pair
locations A and B.
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The next largest contributor to performance is the number of ranks per DIMM. Dual-rank DIMMs perform
significantly better than single-rank DIMMs. Quad-rank DIMMs offer a further performance boost.
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The best performance is obtained when all installed processors are enabled for Hemisphere mode.
Hemisphere mode is optimum when four or eight DIMMs are installed per cartridge. Hemisphere mode
can be achieved with two or six DIMMs per cartridge (2 cartridges per processor), but this configuration
is not optimal for Hemisphere mode.
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Maximum throughput is achieved when all memory cartridges are fully populated with the maximum
number of eight quad-rank DIMMs per cartridge.
Plan the memory configurations using identical DIMMs to achieve the memory size target, taking into account
that 32- and 64-DIMM count configurations result in the highest performance. Using a four-processor
configuration as an example, do the following:
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If the initial memory target is 64 GB, populate a four-processor system with eight cartridges of four 2-GB
DIMMs each for a total of 32 DIMMs. The maximum expansion target is 128 GB with 64 x 2-GB
DIMMs.
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For 4-GB DIMMs, the initial memory target is 128-GB using 32 DIMMs. The maximum expansion target
is 256 GB with 64 DIMMs.
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For 8-GB DIMMs, the initial memory target is 256-GB using 32 DIMMs. The maximum expansion target
is 512 GB with 64 DIMMs.
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The maximum system memory capability is achieved with an initial memory target of 512 GB with 32
x 16-GB DIMMs, 1 TB with 64 x 16-GB DIMMs, and 2 TB with 64 x 32-GB DIMMs. 32-GB DIMMs are
supported only on servers that shipped with (E7) memory cartridges using (E7) processors.

Memory RAS

The server supports the following AMP modes:
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Advanced ECC memory mode provides the greatest memory capacity for a given DIMM size and
provides x4 and x8 SDDC. This mode is the default option for this server. For more information, see
"Advanced ECC memory population guidelines (on page 50)."
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DDDC extends the capability to withstand failures in two x4 DRAM devices. Systems supporting DDDC
can fix both single- and double-DRAM device memory hard errors. This feature greatly extends system
up-time.
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Online Spare memory mode provides protection against persistent DRAM failure. Rank-sparing is more
efficient than DIMM-sparing since only a portion of a DIMM is set aside for memory protection. For
more information, see "Online Spare memory population guidelines (on page 50)."
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Mirrored Memory mode provides the maximum protection against failed DIMMs. Uncorrectable errors
in the DIMMs of one memory cartridge are corrected by the DIMMs in the mirrored cartridge. The two
memory controllers of each processor form a mirrored pair using two memory cartridges. For more
information, see "Mirrored Memory population guidelines (on page 51)."
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