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Red Hat is pleased to announce the general availability of Red Hat Enterprise Linux 5.1 (kernel-2.6.18-53.el5) including:

  - Red Hat Enterprise Linux 5 Advanced Platform for x86,AMD64/Intel(r) 64, Itanium Processor Family, S/390, System p and System z
  - Red Hat Enterprise Linux 5 Server for x86, AMD64/Intel(r) 64,Itanium Processor Family, S/390, System p and System z
  - Red Hat Enterprise Linux 5 Desktop for x86 and AMD64/Intel(r)

This update includes the following enhancements:

  Virtualization improvements

  - Completion of virtualization support on Itanium2 platforms + PV (paravirtualized) and FV (fully virtualized) Itanium2 guests are now fully supported on Itanium2 hardware
      (full virtualization requires hardware assist)- Improved support for FV guests + Live-migration support for FV guests + General performance improvements
    + Host infrastructure for PV drivers (the actual drivers will be delivered separately in the context of the individual supported guest operating systems)
  - Update of the libvirt management layer- New Xen 3.1.0 hypervisor (and updates to libvirt and userspace to work against hypervisor ABI)
  - AMDV support for domain migration and save/restore - Added Kexec/Kdump support for the host in a virtualized environment

  New kernel features includes:

  - Improved ACPI power management support including support for S3 suspend to RAM and S4 hibernate - Support for installation to and boot from dm-multipath
- Updated SATA subsystem
  - Ext3 filesystem now fully supports filesystem sizes of up to 16TB
- Updated CIFS to version 1.48aRH
- IPMI and HPI updates
  - Updated Infiniband support to OFED1.2 version including RDMA over Ethernet
- Expanded in-kernel socket API
- IPv6 improvements
- Added support for shared page table for hugetlb pages

  Hardware support enhancements:

- Driver updates include:
    3w-9xxx, aacraid, aic79xx, aic94xx, alsa, arcmsr, b44, bnx2, cciss, chelsio, e1000, ipmi, ipw2100, ipw2200, ixgb,lpfc, megaraid, megaraid_sas, mpt-fusion, pci, powernow-k8,
qla2xxx, qla3xxx, qla4xxx, s2io, sky2, spidernet, stex, tg3

- Drivers added:
e1000e, forcedeth, netxen_nic, xinput

  Other notable additions:

- Improved auditing
- Smartcard support for SSH
- Integration of LSPP certification related changes
- Samba update for improved interoperability
  - PAM/Kerberos and NSS-LDAP updates for improved integration in Active Directory environments
- Improvements to the "crash"-analysis tool
- Added replication and migration support for NFSv4 referrals
  - Improved support for autofs load balancing with replicated servers


Technology Previews


Technology Preview features are included in Red Hat Enterprise Linux to provide the features with wide exposure.
Customers may find these features useful in a non-production environment.  Customers are free to provide feedback and functionality suggestions for a Technology Preview feature
before it becomes fully supported in a future release.
Technology Preview features are currently not supported under Red Hat Enterprise Linux 5.1 subscription services, may not be functionally complete, and are not supported for production
use.

Erratas will be provided for high-severity security issues in Technology Preview features.  Red Hat intends to fully support Technology Preview features in a future release.  See the Red
Hat Enterprise Linux 5.1 Release Notes for more information about these Technology Previews:

- Support for 32-bit PV guests on 64-bit AMD64/Intel(r) 64 hosts
- Significant stability improvements to the GFS2 file system
- Stateless Linux
- AIGLX including X server and updated Mesa package
  - New devicescape (d80211) stack enabling ipw 4965 wireless driver
- FS-Cache file system
- Systemtap
- iSCSI target device (iSCSI server)
- Firewire stack


Accessing the Software


Red Hat Enterprise Linux 5.1 is available to existing Red Hat Enterprise Linux subscribers via RHN.  The channels will automatically appear in your account.  Installable
binary and source ISO images are available via Red Hat Network at:

https://rhn.redhat.com/network/software/download_isos_full.pxt

You will be required to log in using a valid RHN account with active entitlements.

Errata Advisories describing changes in RHEL5 are available online at:

https://rhn.redhat.com/



Documentation


Release notes for this release are available on the Red Hat documentation site at:

http://www.redhat.com/docs/manuals/enterprise/



The Red Hat Enterprise Linux Team.


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