Online-Spare Memory; Installing A Dimm - IBM System x3550 M3 Type 4254 Installation And User Manual

Online-spare memory

The memory online-spare feature disables the failed memory from the system
configuration and activates an online-spare DIMM to replace the failed active
DIMM.
You can enable either online-spare memory or memory mirroring in the Setup
utility (see "Using the Setup utility" on page 112). When you use the memory
online-spare feature, consider the following information:
v The memory online-spare feature is supported on server models with an Intel
v When you enable the memory online-spare feature, you must install three
v The maximum available memory is reduced to 2/3 of the installed memory
The following table shows the installation sequence for installing DIMMs for each
microprocessor in memory online-spare mode:

Installing a DIMM

Use this information to install a DIMM.
About this task
To install a DIMM, complete the following steps:
Procedure
1. Read the safety information that begins on "Safety" on page v and "Installation
2. Turn off the server and peripheral devices and disconnect the power cords and
3. Remove the cover (see "Removing the cover" on page 51).
4. Open the retaining clip on each end of the DIMM connector.
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IBM System x3550 M3 Type 4254 and 7944: Installation and User's Guide
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Xeon 5600 series microprocessor.
DIMMs per microprocessor at a time. The first DIMM must be in channel 0, the
second DIMM in channel 1, and the third DIMM in channel 2. The DIMMs must
be identical in size, type, rank, and organization, but not in speed. The channels
run at the speed of the slowest DIMM in any of the channels.
when memory online-spare mode is enabled. For example, if you install 72 GB
of memory using RDIMMs, only 48 GB of addressable memory is available
when you use memory online-spare.
Table 13. Memory online-spare mode DIMM population
sequence
Installed
Microprocessor
Microprocessor 1
Microprocessor 2
guidelines" on page 43.
all external cables, if necessary.
DIMM connector
3, 6, 9
3, 6, 9, 2, 5, 8
3, 6, 9, 2, 5, 8, 1, 4, 7
12, 15, 18,
12, 15, 18, 11, 14, 17,
12, 15, 18, 11, 14, 17, 10, 13, 16