v Follow the suggested actions in the order in which they are listed in the Action column until the problem
is solved.
v If an action step is preceded by “(Trained technician only),” that step must be performed only by a trained
technician.
v Go to the IBM support website at http://www.ibm.com/supportportal/ to check for technical information,
hints, tips, and new device drivers or to submit a request for information.
Diagnostic
code Message Description Action
I.1800B [I.1800B] A cache size
mismatch has been
detected for one or
more processor
packages.
Processors have one
or more cache levels
with mismatched size.
1. Make sure that the microprocessor is on the
ServerProven website at
http://www.ibm.com/systems/info/x86servers/
serverproven/compat/us/.
2. Check the IBM support website for a firmware
update and update the server firmware to the
latest level (see “Updating the firmware” on
page 297).
3. (Trained technician only) Remove and
replace the affected microprocessor (error
LED is lit) with a supported type (see
“Installing a microprocessor and heat sink” on
page 282).
I.1800C [I.1800C] A cache type
mismatch has been
detected for one or
more processor
packages.
Processors have one
or more cache levels
with mismatched type.
1. Make sure that the microprocessor is on the
ServerProven website at
http://www.ibm.com/systems/info/x86servers/
serverproven/compat/us/.
2. Check the IBM support website for a firmware
update and update the server firmware to the
latest level (see “Updating the firmware” on
page 297).
3. (Trained technician only) Remove and
replace the affected microprocessor (error
LED is lit) with a supported type (see
“Installing a microprocessor and heat sink” on
page 282).
I.1800D [I.1800D] A cache
associativity mismatch
has been detected for
one or more processor
packages.
Processors have one
or more cache levels
with mismatched
associativity.
1. Make sure that the microprocessor is on the
ServerProven website at
http://www.ibm.com/systems/info/x86servers/
serverproven/compat/us/.
2. Check the IBM support website for a firmware
update and update the server firmware to the
latest level (see “Updating the firmware” on
page 297).
3. (Trained technician only) Remove and
replace the affected microprocessor (error
LED is lit) with a supported type (see
“Installing a microprocessor and heat sink” on
page 282).
32 IBM System x3650 M4 Type 7915: Problem Determination and Service Guide
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