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feature in Red Hat Enterprise Linux 5.3. It enables the iwlwifi 4965GN wireless driver for

Intel® WiFi Link 4965 hardware which allows certain wireless devices to connect to any WiFi

network.

Although the mac80211 component is supported in Red Hat Enterprise Linux 5.3, the symbols

are not included in the symbol whitelist for the kernel.

Global File Syst em 2 (GFS2)

GFS2 is an incremental advancement of GFS. This update applies several significant

improvements that require a change to the on-disk file system format. GFS file systems can be

converted to GFS2 using the utility gfs2_convert, which updates the metadata of a GFS file

system accordingly.

In Red Hat Enterprise Linux 5.2, GFS2 was provided as a kernel module for evaluation

purposes. In Red Hat Enterprise Linux 5.3, GFS2 is now part of the kernel package. If the Red

Hat Enterprise Linux 5.2 GFS2 kernel modules have been installed they must be removed to

use GFS2 in Red Hat Enterprise Linux 5.3.

Improvements in Driver Disk Support

A driver disk, supplied by an OEM, is a single image file (* .img), containing potentially multiple

driver RPMs and kernel modules. These drivers are used during installation to support

hardware that otherwise would not be recognized. The RPMs are installed on the system and

placed into the initrd so that they are supported when the machine reboots.

With Red Hat Enterprise Linux 5.3, installation can automatically detect the presence of a driver

disk based on its file system label, and use the content of that disk during installation. T his

behavior is controlled by the installation command line option dlabel=on, which enables the

automatic search. All block devices with the file system label OEMDRV are examined and drivers

are loaded from these devices in the order in which they are encountered.

iSCSI Boot Firmware T able

Red Hat Enterprise Linux 5.3 now fully supports the iSCSI Boot Firmware Table (iBFT) which

allows for booting from iSCSI devices. This support required that iSCSI disks (nodes) are no

longer marked to start up automatically; the installed system will no longer automatically connect

and login to iSCSI disks when entering runlevel 3 or 5.

iSCSI is usually used for the root filesystem, in which case this change does does not make a

difference as the initrd will connect and login to the needed iSCSI disks even before the runlevel

is entered.

However if iSCSI disks need to be mounted on non root directories, for example /hom e or

/srv, then this change will impact you, since the installed system will no longer automatically

connect and login to iSCSI disks that are not used for the root filesystem.

Using iSCSI disks mounted on non root directories is still possible, but requires the use of one

of the following workarounds:

1. Install the system without use of iSCSI disks mounted on non root directories and later

configure the relevant disks and mount points manually

2. Boot the installed system into runlevel 1, and mark any iSCSI disks that are not used for

the root filesystem for automatic startup by using the following command once per disk:

iscsiadm -m node -T target-name -p ip:port -o update -n

3. Feature Updates

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