2redhat.com Technology overview What’s new in Red Hat Enterprise Linux 7
IdentItY manaGement
CROSS-REALM KERBEROS TRUST
Identity management in Red Hat Enterprise Linux can now establish cross-realm trust with
Microsoft Active Directory. Synchronization between the two identity stores is not needed.
This new capability makes it possible for users with Active Directory credentials to access Linux
resources without requiring additional identity authentication so that single sign-on functionality
exists across Microsoft Windows and Linux domains.
REALMD
Realmd discovers information about the domain or realm automatically and simplies the
conguration needed to join it. Realmd works with Microsoft Active Directory and Red Hat
Enterprise Linux identity management.
Performance manaGement
PERFORMANCE CO-PILOT
Performance Co-Pilot is a new framework for system-wide performance monitoring, recording, and
analysis that provides an API for importing and exporting sampled and traced data. It also includes
tools for interrogating, retrieving, and processing the collected data. Performance Co-Pilot can
transmit this data across a network and integrate with subsystems such as syslogd, sar/sysstat, and
systemd. It provides a common graphical user interface for browsing through all collected data as
well as interactive text interfaces.
TUNED AND TUNED PROFILES
Tuned is an adaptive system-tuning daemon that tunes system settings dynamically depending on
usage. Red Hat Enterprise 7 beta includes several default tuned proles, allowing administrators
to benet from better performance and power management for common workloads with very little
tweaking. By default, the tuned prole selected is based on the Red Hat Enterprise Linux product
variant, though administrators can modify the prole to address intended use cases.
TUNA
Red Hat Enterprise Linux 7 beta enhances Tuna beyond just the process performance monitoring
capabilities found in Red Hat Enterprise Linux 6 with additional support for kernel parameter tuning,
along with prole customization and management.
Tuna has a unied, easy-to-use graphical user interface for system performance tuning, monitoring,
and tuned prole management. It helps customers get the best performance out of their systems
by using proactive load balancing and monitoring to eliminate hot spots, prevent performance
problems, and avoid potential service calls.
NUMA AFFINITY
With more and more systems, even at the low end, presenting non-uniform memory access (NUMA)
topologies, Red Hat Enterprise Linux 7 beta addresses the performance irregularities that such
systems present. A new, kernel-based NUMA afnity mechanism automates memory optimization.
It attempts to match processes that consume signicant resources with available memory and CPU
resources in order to reduce cross-node trafc. The resulting improved NUMA resource alignment
improves performance for applications and virtual machines, especially when running
memory-intensive workloads.
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