Installing A Dimm - IBM System x3950 E Installation Manual

v If memory mirroring is enabled, you can hot-replace one memory card at a time

Installing a DIMM

Complete the following steps to install additional DIMMs:
1. Read the safety information that begins on page v and "Installation guidelines"
2. If you are not hot-swapping a DIMM, turn off the server and peripheral devices,
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IBM System x3950 Type 8878 and System x3950 E Type 8879: Installation Guide
on each memory power bus.
If a problem with a DIMM is detected, light path diagnostics will light the
system-error LED on the front of the server, indicating that there is a problem
and guide you to the defective DIMM. When this occurs, first identify the
defective DIMM; then, remove and replace the DIMM.
The following illustration shows the LEDs on the memory card.
Error
Memory Hot-Swap Enabled
Memory Hot-Swap Enabled LED: When this LED is lit, it indicates that
hot-swap memory is enabled.
Error LED: When this LED is lit, it indicates that a DIMM or memory card has
failed.
Memory Port Power LED: When this LED is off, it indicates that power is
removed from the port and that you can remove the memory card to replace a
failed memory card or DIMM.
on page 7.
and disconnect the power cords and all external cables necessary to replace
the device.
Attention: When moving the memory card, do not allow it to touch any
components or structures inside the server.
If you are hot-swapping a DIMM, make sure that the Memory Hot-Swap
Enabled LED is lit.
Memory Port Power