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XenServer Virtual Machine Installation Guide Installing Linux VMs 32
• Random segmentation faults on loading ELF binaries (Red Hat Bugzilla 247261)
• Disks sometimes do not attach correctly on boot (Red Hat Bugzilla 247265). This has been fixed in Red
Hat Enterprise Linux 5.1.
• Soft lockup messages after suspend/resume or live migration (Red Hat Bugzilla 250994). These mes-
sages are harmless, but there may be a period of inactivity in the guest during live migration as a result
of the lockup.
• Network blackout during live relocation for up to a minute (Red Hat Bugzilla 251527). After migration is
complete, the kernel sends a gratuitous ARP to cause ARP caches to be refreshed and minimize network
downtime. However, carrier detect is delayed in the kernel and so there is a network blackout until the
ARP caches expire or the guest generates an ARP for some other reason.
• RHEL 5.2 contains a bug which normally prevents it from booting on a host with more than 64GiB of
RAM (Red Hat Bugzilla 311431). For this reason XenServer RHEL 5.2 guests are only allocated RAM
addresses in the range below 64GiB by default. This may cause RHEL 5.2 guests to fail to start even if
RAM appears to be available, in which case rebooting or shutting down other guests can cause suitable
RAM to become available. If all else fails, temporarily shut down other guests until your RHEL 5.2 VM
can boot.
Once you have succeeded in booting your RHEL 5.2 VM, install the Citrix Tools for Virtual Machines and
run the command:
xe vm-param-remove uuid=<vm_uuid> param-name=other-config param-key=machine-address-size
to remove the memory restriction.
• When installing the XenServer PV tools you may encounter a warning such as Header V3 DSA sig-
nature: NOKEY, key ID 37017186. Installing the PV tools can cause one or more packages signed
by Red Hat to be installed but by default Red Hat do not include the key used to sign their packages in
the RPM database. To resolve this you can import the Red Hat release key using:
rpm --import /etc/pki/rpm-gpg/RPM-GPG-KEY-redhat-release
before installing the tools. See the section titled New RPM GPG Signing keys in the RHEL release notes
(i386, x86_64) for more information on Red Hat release signing keys.
When you install the XenServer xe-guest-utilities RPM, an entry is added to the yum configuration,
allowing you to pick up kernel updates provided by Citrix when they become available.
CentOS 4
Please refer to the section called “Red Hat Enterprise Linux 4” for the list of CentOS 4 release notes.
Unlike RHEL4, CentOS includes a third-party updates mechanism known as yum. The xe-guest-util-
ities RPM will install a XenServer entry for yum, allowing you to pick up kernel updates provided by Citrix
via the standard update mechanism as they become available.
CentOS 5
Please refer to the section called “Red Hat Enterprise Linux 5” for the list of CentOS 5 release notes.
Oracle Enterprise Linux 5
Please refer to the section called “Red Hat Enterprise Linux 5” for the list of Oracle Enterprise Linux 5
release notes.