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Installing a memory module
Use these instructions to install memory modules in the blade server.
The blade server has a total of sixteen direct inline memory module (DIMM) slots.
The blade server supports very low profile (VLP) DDR3 DIMMs with error code
correction (ECC) in 4 GB, 8 GB, and 16 GB capacities. For a current list of
supported DIMMs for the blade server, see http://www.ibm.com/systems/info/
x86servers/serverproven/compat/us/.
After you install or remove a DIMM, you must change and save the new
configuration information by using the Setup utility. When you turn on the blade
server, a message indicates that the memory configuration has changed. Start the
Setup utility and select Save Settings (see "Setup utility menu" on page 52 for
more information) to save changes.
The memory is accessed internally through the system using four channels per
microprocessor. Each channel contains two DIMM connectors. The following table
lists each channel and which DIMM connectors belong to the channel.
Depending on the memory mode that is set in the Setup utility, the blade server
can support a minimum of 4 GB and a maximum of 128 GB of system memory on
the system board in a blade server with one microprocessor. If two microprocessors
are installed, the blade server can support a minimum of 8 GB and a maximum of
256 GB of system memory. There are four different memory modes:
v Independent channel mode: Independent channel mode gives a maximum of
v Rank sparing mode: In rank sparing mode, one rank of a DIMM in each
Table 2. Memory channel configuration
Memory channel
Channel 0
Channel 1
Channel 2
Channel 3
128 GB of usable memory with one microprocessor installed, and 256 GB of
usable memory with two microprocessors installed (using 16 GB DIMMs). The
DIMMs can be installed without matching sizes. See the table below for the
memory installation order.
populated channel is reserved as spare memory. The spare rank is not available
as active memory. When the active rank memory fails, its content is copied to
the spare rank memory which becomes active. The memory set aside for spare is
one rank per channel. The size of a rank varies depending on the DIMMs
installed. The DIMM population ordering for rank sparing mode is the same as
that for independent channel mode.
DIMM connector
(microprocessor 1)
7 and 8
1 and 2
3 and 4
5 and 6
DIMM connector
(microprocessor 2)
15 and 16
13 and 14
9 and 10
11 and 12
Chapter 3. Installing options
27
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