Lenovo BladeCenter HS23, Installation And User Manual

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Table 3. DIMM population sequence for independent-channel mode and rank-sparing mode
One microprocessor installed Two microprocessors installed
DIMM connectors 1, 7, 3, 5, 2, 8, 4, and 6 DIMM connectors 1, 16, 7, 14, 3, 9, 5, 11, 2,
15, 8, 13, 4, 10, 6, and 12
v Mirrored channel mode: In mirrored channel mode, the memory contents on
channel 0 are duplicated in channel 2, and the memory contents of channel 1 are
duplicated in channel 3. The effective memory available to the system is only
half of that installed. The maximum available memory (with 16 GB DIMMs) is
64 GB for a single microprocessor system and 128 GB for a dual microprocessor
system.
Important: The memory configuration of channel 0 must match that of channel
2, and the memory configuration of channel 1 must match that of channel 3. For
example, if a 4 GB Dual Rank DIMM is installed into the DIMM connector 3
(channel 0), then a 4 GB Dual Rank DIMM must also be installed into the DIMM
connector 7 (channel 2). Table 2 on page 27 lists each channel and which DIMM
connectors belong to the channel.
The following table shows the order that memory DIMMs are installed to use a
mirrored channel mode.
Table 4. DIMM population sequence for mirrored channel mode
DIMM pair
DIMM connectors
One microprocessor
installed Two microprocessors
installed
First 1 and 7 1 and 7
Second 3 and 5 14 and 16
Third 2 and 8 3 and 5
Fourth 4 and 6 9 and 11
Fifth None 2 and 8
Sixth None 13 and 15
Seventh None 4 and 6
Eighth None 10 and 12
Note: The DIMM pairs must be identical in size, type, and rank count.
Attention: DIMMs or DIMM fillers must occupy DIMM connectors 1, 2, 13, 14,
15, and 16 for proper cooling.
To install a DIMM, complete the following steps:
1. Before you begin, read “Safety” on page v and “Installation guidelines” on
page 17.
2. Read the documentation that comes with the DIMMs.
3. If the blade server is installed in a BladeCenter unit, remove it (see
“Removing the blade server from the BladeCenter unit” on page 20 for
instructions).
4.
Carefully lay the blade server on a flat, static-protective surface.
5. Open the blade server cover (see “Removing the blade server cover” on page
21 for instructions).
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BladeCenter HS23 Types 7875 and 1929: Installation and User's Guide