Red Hat Enterprise Linux 5 5.3 Release Notes - Red Hat Customer ...

10 Inhaltsverzeichnis
mouse input.
To recover from this, switch to a virtual terminal using Ctrl+Alt+F1. Log in as the affected user (or
root) and run killall -9 nm-applet. Then, switch back to X11 using Ctrl+Alt+F7. Your
system should be able to receive keyboard and mouse input, although Red Hat recommends that you
logout and login again to allow the system to fully recover.
On Altix systems with an ATI FireMV graphics adapter, the GUI console may not display on one of the
VGA connectors. To workaround this issue, switch to using the other VGA connector on the dongle.
It has been determined that 1024 byte objects in kernel slab may be lost when a call to pipe() fails.
The problem occurs because pipe() allocates pipe files, and then tries to get free file descriptors for
them. If the process is out of file descriptors, pipe() fails, but it does not clean up properly. A fix for
this problem is planned for a forthcoming 5.3 kernel update.
To workaround this issue, ensure that the process calling do_pipe has adequate file descriptors
allocated.
This issue has been observed with multipathd in particular. To avoid the problem with multipathd,
calculate the number of file descriptors (FDs) required using the formula: "FDs = Number of Paths +
32". If the result is greater than the default value of 1024, then the max_fds value in the defaults
section of multipath.conf should be set to the previously calculated value. For example, if there are
255 LUNs with 8 paths each, the line to be added to the defaults section of multipath.conf would be:
max_fds 2072
The libcmpiutil-devel package depends on tog-pegasus-devel, which for the Red Hat
Enterprise Linux Desktop product is only available from the Workstation option. Therefore, any
attempt to install the libcmpiutil-devel package on a system that does not have a Subscription
including the Workstation option or is not subscribed to the Workstation channel on the Red Hat
Network, will fail with an unresolved dependency error.
It is possible in rare circumstances, for makedumpfile to produce erroneous results but not have
them reported. This is due to the fact that makedumpfile processes its output data through a
pipeline consisting of several stages. If makedumpfile fails, the other stages will still succeed,
effectively masking the failure. Should a vmcore appear corrupt, and makedumpfile is in use, it is
recommended that the core be recorded without makedumpfile and a bug be reported.
An issue may be encountered when using system-config-cluster to configure a Postgres 8
resource agent, resulting in the postgresql service failing to start. To include a Postgres resource
agent in your cluster, please check the man page for the agent, and edit the cluster.conf file in
an editor, then update the cluster with the new configuration file using the appropriate cman_tool
command.
Due to outstanding driver issues with hardware encryption acceleration, users of Intel WiFi Link 4965,
5100, 5150, 5300, and 5350 wireless cards are advised to disable hardware accelerated encryption
using module parameters. Failure to do so may result in the inability to connect to Wired Equivalent
Privacy (WEP) protected wireless networks after connecting to WiFi Protected Access (WPA)
protected wireless networks.
To do so, add the following options to /etc/modprobe.conf:
alias wlan0 iwlagn
options iwlagn swcrypto50=1 swcrypto=1
(where wlan0 is the default interface name of the first Intel WiFi Link device)
kdump now restarts when CPUs or DIMMs are hot-added to a system. If multiple items are added at
the same time, several sequential restarts may be encountered. This behavior is intentional, as it
minimizes the time-frame where a crash may occur while memory or processors are not being
tracked by kdump.
1.6. Technology Previews
Software based Fibre Channel over Ethernet (FCoE)