User`s guide

20
Firmware warning message
You can safely ignore the following firmware warning message that might be displayed on some Sun
hardware:
[Firmware Warn]: GHES: Poll interval is 0 for generic hardware error source:
1, disabled.
(Bug ID 13696512)
Huge pages
One-gigabyte (1 GB) huge pages are not currently supported for the following configurations:
• HVM guests
• PV guests
• Oracle Database
Two-megabyte (2 MB) huge pages have been tested and work with these configurations.
(Bug ID 17299364, 17299871, 17271305)
I/O scheduler
The Unbreakable Enterprise Kernel uses the deadline scheduler as the default I/O scheduler. For the
Red Hat Compatible Kernel, the default I/O scheduler is the cfq scheduler.
ioapic failure messages
You can safely ignore messages such as ioapic: probe of 0000:00:05.4 failed with error
-22. Such messages are the result of the ioapic driver attempting to re-register I/O APIC PCI devices
that were already registered at boot time. (Bug ID 17034993)
InfiniBand warning messages when disabling a switch port
You might see the following warning messages if you use the ibportstate disable command to
disable a switch port:
ibwarn: [2696] _do_madrpc: recv failed: Connection timed out
ibwarn: [2696] mad_rpc: _do_madrpc failed; dport (Lid 38)
ibportstate: iberror: failed: smp set portinfo failed
You can safely ignore these warnings. (Bug ID 16248314)
IPoIB mode switching
The Internet Protocol over InfiniBand (IPoIB) driver supports the use of either connected mode or datagram
mode with an interface, where datagram mode is the default mode. Changing the mode of an InfiniBand
interface by echoing either connected or datagram to /sys/class/net/ibN/mode is not supported. It
is also not possible to change the mode of an InfiniBand interface while it is enabled.
To change the IPoIB mode of an InfiniBand interface:
1. Edit the /etc/sysconfig/network-scripts/ifcfg-ibN configuration file, where N is the number
of the interface: