RedHat6 is a Linux version released by RedHat Company, which has high efficiency, scalability and reliability.
Comparison
The latest version is RedHat6.1. Compared with previous versions, RedHat6. 0 adds a lot of functionality.
High efficiency, scalability and reliability
Red Hat Enterprise Linux 6 supports more sockets, cores, threads and memory space. The arrangement of the file system task schedule pays more attention to the comprehensive consideration of task running time, task priority and other factors, and uses hardware response and multi-core topology to optimize the execution of system tasks and resource allocation.
The file system of Red Hat Enterprise Linux 6 defaults to ext4 (the fourth extended file system). This version is more robust, can be expanded to 16TB, and also includes an XFS file system that can be upgraded to 100TB. Its NFSv4 significantly improves the shortcomings of NFSv3 and is backward compatible. The new file system allows running in user space, and users can also test and develop on new FUSE-based file systems (such as cloud file systems).
In terms of high availability, the Conga-based Web interface has been redesigned, adding additional functions and making it easier to use. The cluster communication management system Corosync technology is also more mature, stable and lightweight. The improved KVM server virtual machine can manage services in the presence of physical failures or shutdowns. A simple cluster command can be used to manage the logs of different servers and record events in a consistent format for higher readability.
In terms of power management, the new design technology of the kernel clock in Red Hat Enterprise Linux 6 can keep the system in a state of minimum system consumption. Reduce the power consumption of the I/O subsystem as much as possible. System administrators can also reduce power consumption by controlling current thresholds. In addition, optimized access to real-time devices also helps reduce the energy consumption of writing metadata in the file system.
Unprecedented resource management
In the allocation of system resources, Cgroups of Red Hat Enterprise Linux 6 can organize system tasks for tracking and allow other system services You can control the resources (partitions) that cgroup tasks may consume. Two user-space tools, cgexec and cgclassify, provide simple configuration and management capabilities for cgroups. At the same time, a memory resource controller and a network resource controller are applied to the cgroup to achieve optimal application of memory resources and network traffic.
In terms of storage, Red Hat Enterprise Linux 6 supports SAN-based large-scale storage, automatic I/O calibration and self-tuning, and extends SCSI and ATA standards and I/O prompts to allow automatic tuning and I/O O Calibration.
Red Hat Enterprise Linux 6 supports IPv6 in networking functions. The multi-queue networking function improves processing parallelism, allowing users to get better performance from multiple processors and CPU cores. Support for data center bridging includes data traffic prioritization and flow control to improve service quality. In addition, data traffic priority and traffic control are targeted to improve service quality.
Stable application development and production platform
Mainly improves the Web infrastructure in three aspects: Apache, Squid and Memcached, Red Hat Enterprise Linux 6 supports Apache2.2 version, while Squid mainly supports manageability and IPv6 performance. The new version of Red Hat supports Memcached 1.4.4, a high-performance, highly scalable, distributed, memory-based object caching system that greatly improves the speed of dynamic web applications.
In terms of Java performance support, the tight integration of Red Hat Enterprise Linux and OpenJDK includes support for Java probes in SystemTap to support better Java debugging. We all know that Tomcat6 is an open source and best-in-class application server running on the Java platform. By supporting Java Servlets and Java Server Pages (JSP), Tomcat provides a stable and reliable environment for developing and deploying dynamic web applications. Therefore, support for Tomcat 6 has also been improved in Red Hat Enterprise Linux.
In addition, Red Hat Enterprise Linux has also made a number of adjustments to applications and databases PostgreSQL 8.4.4, MySQL 5.1.47 and MySQL 5.1.47, which have greatly improved performance. .
Integrated virtualization
Red Hat Enterprise Linux is mainly based on kernel virtualization, fully integrating the KVM hypervisor into the kernel, so all RHEL system improvements are Conducive to virtualized environments. And the application environment is consistent for both physical and virtual systems. This allows users to easily move virtual machines between hosts. The resulting deployment flexibility allows administrators to consolidate resources onto fewer machines during off-peak periods or free up hardware during maintenance downtime.
Leverage the kernel's hardware abstraction to enable applications to move from a physical environment to a virtualized environment independent of the underlying hardware. Improved CPU and memory scalability allows more virtual machines per server. The virtualization technology uses advanced virtualization interfaces, including non-traditional devices such as clocks (supported by the idle loop kernel), interrupt controllers, spinlock subsystems, and vmchannels.
Enterprise Manageability
Installation options for Red Hat Enterprise Linux 6 have been reorganized into Workload Profiles, enabling each system installation to deliver the right software for a specific task. The Standards-Based Linux Manageability Specification (SBLIM) uses Web-Based Enterprise Management (WBEM) to manage systems. Replaced mkinitrd with Dracut, minimizing the impact of underlying hardware changes, making it easier to maintain, and making it easier to support third-party drivers.
Improved printing technology support so that printers can promptly discover printer configuration services from CUPS and system-config-printer. The addition of SNMP-based monitoring of ink and toner supply levels and printer status monitoring simplifies monitoring capabilities, allowing users to effectively manage ink and toner inventory.
Additionally, Samba improvements for Red Hat Enterprise Linux include support for Windows 2008 R2 trust relationships: Windows cross-forest, transitive trusts, and one-way domain trusts. Allows applications to use OpenChange to access Microsoft Exchange Server using native protocols, allowing mail clients such as Evolution to more tightly integrate with Exchange Server.
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