Table of Contents
Advertisement
CPU2
Microprocessor 2
DIMM installation sequence
Depending on the server model, the server may come with a minimum of one 2 GB
or 4 GB DIMM installed in slot 1. When you install additional DIMMs, install them in
the order shown in the following table to optimize system performance. In
non-mirroring mode, all three channels on the memory interface for each
microprocessor can be populated in any order and have no matching requirements.
Table 11. Non-mirroring (normal) mode DIMM installation sequence
Number of installed
microprocessor
One microprocessor
installed
Two microprocessors
installed
Memory mirrored channel
Memory mirrored channel replicates and stores data on two pairs of DIMMs within
two channels simultaneously. If a failure occurs, the memory controller switches
from the primary pair of memory DIMMs to the backup pair of DIMMs. To enable
memory mirrored channel through the Setup utility, select System Settings →
Memory. For more information, see "Using the Setup utility" on page 345. When
you use the memory mirrored channel feature, consider the following information:
v When you use memory mirrored channel, you must install a pair of DIMMs at a
time. The two DIMMs in each pair must be identical in size, type, and rank
(single, dual, or quad), and organization, but not in speed. The channels run at
the speed of the slowest DIMM in any of the channels.
v The maximum available memory is reduced to half of the installed memory when
memory mirrored channel is enabled. For example, if you install 64 GB of
memory using RDIMMs, only 32 GB of addressable memory is available when
you use memory mirrored channel.
Microprocessor 1
DIMM connector population sequence
1, 8, 3, 6, 2, 7, 4, 5
1, 9, 8, 16, 3, 11, 6, 14, 2, 10, 7, 15, 4, 12, 5, 13
Chapter 5. Removing and replacing server components
CPU1
313
Advertisement
Table of Contents
