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Red Hat 6 beta está disponível!

Certeza que esse release uma hora iria aparecer eu tinha.
Segundo a própria Red Hat o maior foco foi na Virtualização, veja:

The major themes of the release include pervasive virtualization, improved scalability and availability, increased power efficiency, and delivery of some of the latest software technologies. In line with today’s Beta availability, we’ll briefly highlight a few of the new and noteworthy improvements:

* Comprehensive power management capabilities
Time-keeping improvements within the kernel allow the system to transition processors that do not have active tasks into the idle state more frequently. This leads to cooler CPUs and greater power savings compared to previous releases. New monitoring tools like powertop are designed to help pin-point power consumption issues that can be resolved in order to further reduce power consumption. New tuning tools like “tuned,” which is an adaptive system tuning daemon, allow the system to adjust power consumption based on analysis of service usage patterns.
* Performance enhancements
Red Hat engineers have played key roles in the upstream development of a wide range of kernel performance enhancements that we plan to feature in Red Hat Enterprise Linux 6. This includes a complete rewrite of the process scheduler so that it more fairly shares compute cycles among processes and provides more determinism by enabling higher-priority processes to run with minimal interference from lower-priority processes. Additionally, there are a substantial range of multi-processor lock synchronization enhancements. For example, elimination of unnecessary locking occurrences, replacement of many spin locks with sleep locks and implementation of more efficient locking primitives. These foundational changes impact a number of kernel subsystems.
* Scalability enhancements
Recent hardware launches have resulted in significant growth in commodity computing platforms. For example it is now possible to have 64 CPUs and 2TB of memory in a 5U rackmount form factor. These systems and their successors are approaching the scalability limits of Red Hat Enterprise Linux 5. A primary feature of Red Hat Enterprise Linux 6 is that it is designed to provide the scalability to handle systems well into the future. Capabilities range from optimized support for large CPU counts and memory configurations to the ability to handle an increased number of system-interconnect buses and peripherals. These capabilities are appropriate for both bare metal and virtualized environments as virtualization becomes as pervasive as bare metal deployments.
* New security features
A new service called the System Security Services Daemon (SSSD) provides central management of identities. It also has the ability to cache credentials for offline use. The new SELinux sandbox feature allows execution of untrusted content in an isolated environment designed not to impact the rest of the system. This includes the ability to isolate any virtualized guest running on Red Hat Enterprise Linux 6.
* Resource management
Fine-grained control, allocation and management of hardware resources is available with the help of a new framework called Control Groups or cgroups. cgroups work at the process group level and can be used to manage resources ranging from CPU, memory, network and disk I/O for applications. This framework is also used to manage virtual guests.
* Virtualization
Red Hat Enterprise Linux 6 builds on the integrated KVM-based virtualization provided by earlier Red Hat Enterprise Linux releases. Incorporating numerous performance, scheduler and hardware support enhancements, it offers improved flexibility and control regardless of the deployment model.
* Storage
Support for network block storage via FCoE and iSCSI protocols make it possible to perform online re-size of mirrored and multipath volumes using LVM/DM.
* File system
This release includes the ext4 file system. As the next generation of the extended filesystem family, it includes support for larger file sizes, more efficient allocation of disk space, better file system checking and more robust journaling. In addition to ext4, the XFS® filesystem is also expected to be available. XFS® is well suited for extremely large file and directory sizes and includes features such as the ability to defragment and re-size the filesystem while active. NFS has been updated to version 4, which includes support for IPv6.
* Reliability, availability and serviceability (RAS)
This release leverages new hardware capabilities to offer features such as hot-add of devices and memory, and enhanced error checking for PCIe devices via AER. It also is expected to include advanced data integrity features (DIF/DIX) that validate data from application to platter via hardware checksums. The introduction of ABRT (Automated Bug Reporting Tool) provides a more consistent way to identify and report system exception conditions like kernel failures (kernel oops) and userspace application crashes.
* Compiler and tools
The GCC compiler has been updated to version 4.4. This version complies with the C++ 0x standard draft. It also conforms to OpenMP 3.0 and includes many debugging capabilities. SystemTap improvements include better support for user-space probing, a more secure script-compile server and a new unprivileged mode that allows non-root users to access SystemTap. Additionally, there are many other libraries that have been updated to the latest versions, as well as additional languages and runtime environments, including the complete LAMP stack and OpenJDK.
* Desktop
This release introduces automatic detection of display types and support for multiple displays. We have also included updated nouveau drivers to support NVIDIA graphics devices. Of course, no release would be complete without significant updates to the GNOME and KDE desktops.

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