Dell PowerVault NX3100 Hardware Owner's Manual - Page 84
Mode-Specific Guidelines, Advanced ECC Lockstep Mode Support, Memory Mirroring Support
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Mode-Specific Guidelines Three memory channels are allocated to each processor. The number of channels used and the allowable configurations depend on the memory mode selected. Advanced ECC (Lockstep) Mode Support In this configuration, the two channels closest to the processor are combined to form one 128-bit channel. This mode supports Single Device Data Correction (SDDC) for both x4- and x8-based memory modules. Memory modules must be identical in size, speed, and technology in corresponding slots. Memory Mirroring Support The system supports memory mirroring if identical memory modules are installed in the two channels closest to the processor (memory should not be installed in the farthest channel). Mirroring must be enabled in the System Setup program. In a mirrored configuration, the total available system memory is one-half of the total installed physical memory. Optimizer (Independent Channel) Mode In this mode, all three channels are populated with identical memory modules. This mode permits a larger total memory capacity but does not support SDDC with x8-based memory modules. A minimal single-channel configuration of one 1 GB memory module per processor is also supported in this mode. Table 3-1 and Table 3-2 show sample memory configurations that follow the appropriate memory guidelines stated in this section. The samples show identical memory-module configurations and their the physical and available memory totals. The tables do not show mixed or quad-rank memory-module configurations, nor do they address the memory speed considerations of any configuration. 84 Installing System Components