cache line is provided per channel). For more information on the independent
memory mode, see “Independent memory mode” on page 55.
–
Lockstep memory mode:
: This mode provides the best memory RAS features.
It supports dual-device data correction (DDDC) for x4 SDRAM technology.
The memory controller handles all cache lines across the two DDR3 channels
(Channel 0 and Channel 1) on each memory channel. Each DDR3 channel
provides 4 x 8 byte data transfers (64 byte cache line is provided per channel
pair). For more information about the lockstep memory mode, see “Lockstep
memory mode” on page 59.
For more information and DIMM population sequence for independent memory
mode, see “Memory mirroring in independent memory mode” on page 56 and
“Memory rank sparing in independent mode” on page 58. For more information
and DIMM population sequence for lockstep memory mode, see “Memory
mirroring in lockstep mode” on page 60 and “Memory rank sparing in lockstep
mode” on page 62.
Flash DIMMs
This topic provides information about eXFlash DIMM installation and
requirements.
The IBM System x3850 X6 and x3950 X6 server provides support for eXFlash
DIMMs. You can use Flash DIMMs in unused DIMM slots for solid state drive
storage on the server. For more information and notes about installing DIMMs, see
“Installing a memory module” on page 47. Flash DIMMs are only supported in
Independent memory mode. For more information about DIMM installation
sequence for Independent memory mode, see “Independent memory mode” on
page 55. The DIMM installation order for Flash DIMMs follows the independent
mode (performance) installation order.
When you install Flash DIMM, consider the following information:
v
RDIMMs must be installed in the server with Flash DIMMs. You cannot install
all Flash DIMMs in the server.
v
RDIMMs must be installed first, then Flash DIMMs can be installed.
v
When you install Flash DIMMs, do not leave an empty DIMM slot between
installed DIMMs.
v
For both the 4-socket and 8-socket configurations, one Flash DIMM can be
installed in each DDR3 channel. A maximum of 8 Flash DIMMs can be installed
in each compute book. A maximum of 32 Flash DIMMs can be installed in the
server. In the 8-socket configuration of the server, the Flash DIMMs must be
installed in the bottom node only.
v
Mixing of LRDIMMs and Flash DIMMs in the same server is not supported.
v
Flash DIMMs are supported in Independent memory mode only.
v
Flash DIMMs are not supported in Lockstep memory mode, memory mirroring,
or memory rank sparing.
v
You can install any configuration of the supported Flash DIMMs (up to 32 Flash
DIMMs) in the server.
v
The same level of firmware should be installed on all Flash DIMMs in the
server.
v
When you install Flash DIMMs in the server, see “Environment” in the “Server
features and specifications” on page 7 section for the supported environment
information for Flash DIMMs.
Chapter 2. Installing optional devices
51
Summary of Contents for X3850 X6
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