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1. Expand the initrd using gunzip.
2. Unpack it using cpio -i.
3. In the init file, search for the line containing the string iscsistartup. This line also contains
the IQN and IP address of the iSCSI target; update this line with the new IQN and IP address.
4. Re-pack the initrd using cpio -o.
5. Re-compress the initrd using gunzip.
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Red Hat Enterprise Linux 5 5.1 Release Notes
The ability of the operating system to obtain iSCSI information held by the Open Firmware / iBFT
firmware is planned for a future release. Such an enhancement will remove the need to modify the
initrd (stored in the iSCSI storage) for each initiator whenever the IP address or IQN of the iSCSI
target is changed.
3.1.1.3. Using open-iscsi On A System With No Firmware Boot Support for iSCSI
If you are using the open-iscsi software initiator on a system with no firmware boot support for iSCSI,
use a network boot capability (such as PXE/tftp). In this case, follow the same procedure described
earlier to determine the initiator IQN and specify the IP address of the iSCSI target. Once completed,
copy the initrd to the network boot server and set up the system for network boot.
Similarly, if the IP address or IQN of the iSCSI target is changed, the initrd should be modified
accordingly as well. To do so, use the same procedure described earlier to modify the initrd for each
initiator.
3.2. Feature Updates
EXT3 Enhancement
The maximum capacity of the EXT3 is now 16TB (increased from 8TB). This enhancement was
originally included in Red Hat Enterprise Linux 5 as a Technology Preview, and is now fully
supported in this update.
yum-security
It is now possible to limit yum to install security updates only. To do so, simply install the yum-
security plugin and run the following command:
yum update --security
Restarting a Resource Independently
It is now possible to restart a resource in a cluster without interrupting its parent service. This
can be configured in /etc/cluster/cluster.conf on a running node using the
__independent_subtree="1" attribute to tag a resource as independent.
For example:
Here, two file system resources are used: One and T wo. If One fails, it is restarted without
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3. Release Notes for ia64
interrupting T wo. If T wo fails, all components (One, children of One and children of T wo) are
restarted. At no given time are T wo and its children dependent on any resource provided by
One.
Note that Samba requires a specific service structure, and as such it cannot be used in a
service with independent subtrees. This is also true for several other resources, so use the
__independent_subtree="1" attribute with caution.
Virtualization
The following Virtualization updates are also included in this release:
AMD-V is now supported in this release. This enables live domain migration for fully
virtualized guests.
The in-kernel socket API is now expanded. This was done to fix a bug that occurs when
running sctp between guests.
Virtual networking is now part of libvirt, the virtualization library. libvirt has a set of
commands that sets up a virtual NAT/router and private network for all local guests on a
machine. This is especially useful for guests that do not need to be routable from the
outside. It is also useful for developers who use Virtualization on laptops.
Note that the virtual networking capability adds a dependency on dnsmasq, which handles
dhcp for the virtual network.
For more information about libvirt, refer to http://libvirt.org.
libvirt can now manage inactive virtual machines. libvirt does this by defining and
undefining domains without stopping or starting them. This functionality is similar to the
virsh define and virsh undefine commands.
This enhancement allows the Red Hat Virtual Machine Manager to display all available
guests. This allows you to start these guests directly from the GUI.
Installing the kernel-xen package no longer leads to the creation of incorrect / incomplete
elilo.conf entries.
DomU no longer panics when you perform a save/restore numerous times after a kernel
compilation.
The xm create command now has a graphical equivalent in virt-m anager.
Nested Paging (NP) is now supported. This feature reduces the complexity of memory
management in virtualized environments. In addition, NP also reduces CPU utilization in
memory-intensive guests.
At present, NP is not enabled by default. If your system supports NP, it is recommended that
you enable NP by booting the hypervisor with the parameter hap=1.
Virtualization is fully supported in this update. This feature was originally introduced as a
Technology Preview in Red Hat Enterprise Linux 5.
Note, however, that installing Red Hat Enterprise Linux 5 on a guest will result in a guest freeze
and host error, even if the host runs Red Hat Enterprise Linux 5.1. As such, Red Hat Enterprise
Linux 5 remains unsupported as a guest in this architecture. Red Hat Enterprise Linux guests
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