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General Rules for System Configuration
D-9
D
D.6 SIMM or NVSIMM Installation Rules
Information in this section applies to SIMMs and NVSIMMs. On SPARCcenter
2000 boards (having two buses), install eight SIMMs at a time, four in group x
(where x = 0 or 1) on bus 0 and four in the same group number on bus 1.
Note – Fill the lowest -numbered SIMM groups first. For multiple-board
configurations, fill group 0 on each board before filling group 1 (but see
following for rules for optimizing system performance.)
Note – These devices were designed for the SPARCcenter 2000 and
SPARCcenter 2000 and are not interchangeable with other types of SIMMs.
The rules for installing SIMMS in the system board are:
•
Always install eight SIMMs at a time, in two groups of four.
•
Install one group on bus 0, and the second group in the matching group
number on the other bus. For example, fill group 0 on bus 0 and group 0 on
bus 1. (Although it is not mandatory that both groups must be on the same
board, to avoid confusion it is best to put both groups on the same board.)
•
Install SIMMs in both group 0 locations on every board (in groups of two or
four boards), before adding SIMMs to any group 1 location.
•
A minor exception to the above rule is that to optimize memory
performance, you should keep the numbers of memory groups balanced
across multiples of two or four boards. (This allows the system to interleave
memory across two or four boards.)
•
For example, if a system has five boards, and group 0 is filled on all five
boards, performance will not be optimal. Memory addresses will be
interleaved across the first four boards, but not across the fifth. If this
memory is accessed often, performance will suffer.
•
Ideally (for the case of five boards), populate group 0 across four boards,
then populate group 1 across four boards. The next most optimal case
would be to populate group 0 across four boards, then populate group 1
across two boards. Both cases allow for interleaving across group 0 memory
and separate interleaving across group 1 memory.
•
Do not mix SIMM sizes within the two groups of four SIMMs.