RHEL6 Features --> Part-1
Fourth
Extended Filesystem (ext4) Support
The fourth
extended filesystem (ext4) is based on the third extended filesystem (ext3) and
features a number of improvements. These include support for larger file
systems and larger files, faster and more efficient allocation of disk space,
no limit on the number of subdirectories within a directory, faster file system
checking, and more robust journaling. The ext4 file system is selected by
default and is highly recommended.
Network File
System (NFS)
A Network File
System (NFS) allows remote hosts to mount file systems over a network and
interact with those file systems as though they were mounted locally. This
enables system administrators to consolidate resources onto centralized servers
on the network. Red Hat Enterprise Linux 6 supports NFSv2, NFSv3, and NFSv4
clients. Mounting a file system via NFS now defaults to NFSv4.
Additional
improvements have been made to the NFS in Red Hat Enterprise Linux 6, providing
enhanced support over Internet Protocol version 6 (IPv6)
Logical
Volume Manager (LVM)
Volume
management creates a layer of abstraction over physical storage by creating
logical storage volumes. This provides greater flexibility over just using
physical storage directly. Red Hat Enterprise Linux 6 manages logical volumes
using the Logical Volume Manager (LVM).
LVM Mirror Improvements
LVM supports
mirrored volumes. By creating mirrored logical volumes, LVM ensures that data
written to an underlying physical volume is mirrored onto a separate physical
volume.
Merging Snapshots
Red Hat
Enterprise Linux 6 introduces the ability to merge a snapshot of a logical
volume back into the origin logical volume. This allows system administrators
to revert any changes that have occurred on a logical volume by merging back to
the point preserved by a snapshot.
For more
information about the new snapshot merge feature, consult the
lvconvert manpage.
Four-Volume Mirrors
LVM in Red Hat
Enterprise Linux 6 supports creating a logical volume with up to four mirrors.
Mirroring Mirror Logs
LVM maintains a
small log (on a separate device) which it uses to keep track of which regions
are in sync with the mirror or mirrors. Red Hat Enterprise Linux 6 provides the
ability to mirror this log device.
LVM Application Library
Red Hat
Enterprise Linux 6 features the new LVM Application Library (lvm2app), allowing
the development of LVM based storage management applications.
tuned
tuned is a system tuning daemon that monitors system components and
dynamically tunes system settings. Utilizing ktune (the
static mechanism for system tuning), tuned can monitor and tune devices (e.g.
hard disk drives and ethernet devices). Red Hat Enterprise Linux 6 also
introduces diskdevstat for monitoring disk operations and netdevstat for monitoring network operations.
Yum
Via its plugin
architecture, Yum provides new or enhanced support for various capabilities
such as delta RPMs (using the presto plugin), RHN communication (rhnplugin),
and auditing and applying—using a calculated least-invasive (minimal) number of
updates—only relevant security fixes to a system (security plugin).
Yum also ships
with the yum-config-manager utility, which shows exhaustive
information about all set configuration options and parameters for each
individual repository.
Security-Enhanced
Linux (SELinux)
Security-Enhanced
Linux (SELinux) adds Mandatory Access Control (MAC) to the Linux kernel, and is
enabled by default in Red Hat Enterprise Linux 6. A general purpose MAC
architecture needs the ability to enforce an administratively-set security
policy over all processes and files in the system, basing decisions on labels
containing a variety of security-relevant information.
Internet
Protocol version 6 (IPv6)
The
next-generation Internet Protocol version 6 (IPv6) specification is designed as
the successor to Internet Protocol version 4 (IPv4). IPv6 specifies a wide
range of improvements over IPv4, including: expanded addressing capabilities,
flow labeling and simplified header formats.
Wireless
Support
Red Hat
Enterprise Linux 6 contains enhanced support for wireless networking and
devices. Support for the wireless local area networking using the IEEE 802.11
set of standards has been improved, with added support for 802.11n based
wireless networking.
Suspend and
Resume
Suspend and
resume is a current feature in Red Hat Enterprise Linux that allows a machine
to be placed into and removed from a low power state. The new kernel
modesetting feature enables enhanced support for the suspend and resume
feature. Previously, graphics hardware was suspended and resumed via userspace
applications. In Red Hat Enterprise Linux 6, this functionality has moved into the
kernel, providing a more reliable mechanism for enabling low power mode.
Firefox
Red Hat
Enterprise Linux 6 introduces version 3.5 of the Mozilla Firefox web browser.
OpenOffice.org
3.1
Red Hat
Enterprise Linux 6 features OpenOffice.org 3.1, adding support for reading a
wider range of file formats, including Microsoft Office OOXML format.
Additionally, OpenOffice.org has improved file locking support and has the
ability to render graphics using anti-aliasing.
Thunderbird 3
Red Hat
Enterprise Linux 6 includes version 3 of the Mozilla Thunderbird email client,
providing tabbed messaging, smart folders, and a message archive.
Samba
Samba is a suite
of programs which use NetBIOS over TCP/IP (NetBT) to enable the sharing of
files, printers and other information. This package provides a Server Message
Block or SMB server (also known as a Common Internet File System or CIFS
server) which can provide network services to SMB/CIFS clients.
Red Hat
Enterprise Linux 6 provides the following significant enhancements to Samba:
- Internet Protocol
version 6 support (IPv6)
- Support for Windows
2008 (R2) trust relationships.
- Support for Windows 7
domain members.
- Support for Active
Directory LDAP signing/sealing policy.
- Improvements for
libsmbclient
- Better support for Windows
management tools (mmc and User Manager)
- Automatic machine
password changes as domain member
- New registry based
configuration layer
- Encrypted SMB transport
between Samba client and server
- Full support for
Windows cross-forest, transitive trusts and one-way domain trusts
- New NetApi remote
management and winbind client C libraries
- A new graphical user
interface for joining Windows Domains
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