Scenario: IMM or system fails after configuration change or IMM reboot -IBM System x3550 M2, x3650 M2.
Symptom
After changing the hardware configuration of System x3550 M2 or System x3650 M2, most often when adding options such as memory, hard drives, and Central Processing Units (CPUs), the system may become unresponsive after about 30 minutes.
Some cases prevented the box from powering on again, and in some cases, power on was possible, but network connectivity to the Integrated Management Module (IMM) was not possible. The issue may also occur when rebooting the IMM while the system is powered on with certain hardware configurations
Affected configurations
System x3550 M2, type 4198, any model
System x3550 M2, type 7946, any model
System x3650 M2, type 4199, any model
System x3650 M2, type 7947, any model
IMM firmware versions older than YUOO24I version 1.04
Solution
A fix was provided in IMM firmware yuoo24I (version 1.04).
All users of System x3550 M2 and System x3650 M2 should update to this IMM firmware or later to avoid the possibility of replacing the system board.
The file is available from the 'Software and device drivers ¬IBM System x' web site at the following
URL: http://www.ibm.com/support/docview.wss?uid=psg1MIGR-4JTS2T
Additional information
An internal buffer overrun issue in the IMM code caused the IMM firmware to repeatedly crash. The internal buffering issue was corrected in yuoo24I. Hardware configurations with large numbers of memory DIMMs and hard disk drives could result in unresponsive systems if the system was powered on and the IMM was rebooted with older firmware
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