Red Hat ENTERPRISE LINUX 5.4 - TECHNICAL NOTES Manual page 304

Chapter 3. Technology Previews
default to -fno-gnu89-inline. This is necessary because many headers shipped as part of
Red Hat Enterprise Linux 5 expect GNU in-line semantics instead of ISO C99 semantics. These
headers have not been adjusted to request GNU in-line semantics through attributes.
Kernel Tracepoint Facility
In this update, a new kernel marker/tracepoint facility has been implemented as a Technology
Preview. This interface adds static probe points into the kernel, for use with tools such as
SystemTap.
Device Failure Monitoring of RAID sets
Device Failure Monitoring, using the tools dmraid and dmevent_tool, is included in Red Hat
Enterprise Linux 5.3 as a Technology Preview. This provides the ability to watch and report device
failures on component devices of RAID sets.
Software based Fibre Channel over Ethernet (FCoE)
The Fibre Channel over Ethernet (FCoE) driver (fcoe.ko), along with libfc, provides the ability to
run FCoE over a standard Ethernet card. This capability is provided as a technical preview in Red
Hat Enterprise Linux 5.3.
To enable this feature, you must login by writing the network interface name to the /sys/
module/fcoe/parameters/create file, for example:
echo eth6 > /sys/module/fcoe/parameters/create
To logout, write the network interface name to the /sys/module/fcoe/parameters/destroy
file, for example:
echo eth6 > /sys/module/fcoe/parameters/destroy
For further information on software based FCoE refer to:
index.php/FCoE_Initiator_Quickstart.
Red Hat Enterprise Linux 5.3 provides full support for FCoE on three specialized hardware
implementations. These are: Cisco fnic driver, the Emulex lpfc driver, and the Qlogic qla2xx
driver.
iSER Support
iSER support, allowing for block storage transfer across a network, has been added to the scsi-
target-utils package as a Technology Preview. In this release, single portal and multiple
portals on different subnets are supported. There are known bugs when using multiple portals on
the same subnet.
To set up the iSER target component install the scsi-target-utils and libibverbs-devel RPM. The
library package for the InfiniBand hardware that is being used is also required. For example:
host channel adapters that use the cxgb3 driver the libcxgb3 package is needed, and for host
channel adapters using the mthca driver the libmthca package is needed.
There is also a known issue relating to connection timeouts in some situations. Refer to
19
Bugzilla #470627
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https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=470627
286
for more information on this issue.
http://www.open-fcoe.org/openfc/wiki/
Red Hat