Owners Manual

Cause The BIOS APIC table has static entries for the highest conguration of the processor supported on the system. For
example, a system supports 16 core processor, however if the system has a 14 core processor populated, then
APIC IDs 15 and 16 are available in the BIOS APIC table, and the kernel tries to enable the core processor. But,
physically a 14 core processor is available, and APIC IDs 15 and 16 are not initialized, and hence the error occurs.
Work around This error message can be ignored because there is no functionality loss.
Known issues in Red Hat Enterprise Linux 6.6
Biosdevname does not rename port2 of Mellanox device
Description The dev_id of port1 and port2 of Mellanox device are same because of which biosdevname fails to rename.
Cause The dev_id support is replaced with dev_port which need to be incorporated in mlx_en driver and
biosdevname.
Work around Add kernel boot parameter "biosdevname=0", this returns back to ethN naming.
Unable to boot Red Hat Enterprise Linux 6.6 with NVMe
devices
Description
Unable to boot Red Hat Enterprise Linux 6.6 with NVMe devices, because there is a limitation in the boot loader.
Cause Limitation in the boot loader.
Work around Use NVMe device as data storage, and not as a boot volume.
Logical Processor Idling feature is not working
Description
When BIOS option is selected, Logical Processor Idling feature is enabled, it allows the operating system to fall into
a low power consumption mode during low work load conditions.
Cause Red Hat Enterprise Linux 6.6 does not have support for ACPI processor aggregator device, which never allows the
system to enter in to power saving state.
Work around This error can be ignored because there is no functionality loss.
Resolved issues in Red Hat Enterprise Linux 6.6
Kernel panic occurs when OMSA services are started on Red
Hat Enterprise Linux 6.5
Description:
Kernel panic occurs when OpenManage Server Administrator (OMSA) services are started on Red Hat Enterprise
Linux 6.5.
Cause: The Kernel might spend more time in servicing the kernel timer functions and set a ag to prevent the other code
from resetting the timer hardware (APIC timer). The kernel then programs the timer hardware for a timeout up to
100 ms to run the kernel timer functions. At the next timer hardware interrupt, this ag is cleared, where the ag
Installation instructions and important information 17