Bay Networks 5782 Guide de l'utilisateur télécharger pdf (Page 64)

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5: Advanced Serverboard Setup

Memory DIMM Rules

Use the following rules when installing memory DIMMs:

• Minimum Number of DIMMs—A minimum of one DIMM on each processor must always

be installed.

• Slot Order—For each memory channel, populate the DIMM slot that is furthest from the

processor first.

• Channel Balancing—For best performance, populate each channel with the same number

of identical DIMMs.

• Mixing DIMM Speeds—All DIMMs populated on all channels on both processors should

be able to support the highest frequency, because the timings of the slowest DIMM will be

applied to all DIMMs.

• Mixing DIMM Sizes—When mixing DIMMs on a channel that have a mixed number of

ranks, it is recommended to have the total number of ranks on the channel be even to avoid

bandwidth degradation. Example: placing a single-rank DIMM and a dual-rank DIMM on

the same channel is not desirable. The total number of ranks would be three, an odd number

of ranks. If mixing is unavoidable, then DIMMs with the most ranks need to be populated in

the slots farthest from the processor (the “A” slots).

• Maximum Memory Performance —The DIMMs within a node must be identical in speed

and rank:

– Speed—1066 or 1333 M transfers/sec (MT/s)

– Number of ranks —1, 2, or 4

• Single-processor Node Board

Only Processor 2 is installed in a single processor node board. Only install DIMMs in the P2

DIMM slots. Follow the Processor 2 section of Table 5-1 and Table 5-2 for installing

DIMMs.

• Minimum Compute Blade Memory Size:

There is 4GB compute blade minimum in systems running SGI Management Center

software.

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Bay Networks 5782 Guide de l'utilisateur Page 64