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 will 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:
Memory Hot-Swap Enabled
Memory Port Power
Error
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.
Installing a memory module
Attention: Static electricity that is released to internal server components when
the server is powered-on might cause the server to halt, which could result in the
loss of data. To avoid this potential problem, always use an electrostatic-discharge
wrist strap or other grounding system when working inside the server with the
power on.
Complete the following steps to install additional memory modules:
1. Read the safety information beginning on page v and “Installation guidelines” on
page 7.
2. If you are not hot-swapping a DIMM, turn off the server and peripheral devices,
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 impact 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.
12 IBM System x3850 Type 8864: Installation Guide
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