The perfect combination of RHEL 5 Xen is now available

RHEL 5 is a new system with high security and stability ., Xen is an open-source Virtual Machine monitor developed by the University of Cambridge. It intends to run up to 128 fully functional operating systems on a single computer, so the perfect combination of RHEL 5 Xen is now available.

Red Hat adopted Xen server virtualization technology for the first time in the new operating system. The difference is that the implementation of RHEL 5 Xen has evolved much more than what NetworkWorld saw in SUSE 10, although it still lacks comprehensive tools.

We can easily run the RHEL 5 Xen hypervisor and then quickly build the modified so-called "Xen" host) kernel. The customer operation sessions can be quickly established on these instances and subsequently monitored through Virt-Manager. Virt-Manager is an open-source Xen tool built in rhel5. However, the problem with using Xen in RHEL5 is that they are not integrated from a management perspective and depend on an "empirical" Xen management application, instead of using different standard open-source tools intuitively and sequentially.

When NetworkWorld compares the performance of SUSE 10 to RHEL5 native kernel (native kernel), the default setting is used for operating system installation ), no significant difference was found between the latest versions of the two operating systems in the LMBench test results see the link article "how to test RHEL5.

RHEL5 supports multi-core CPU and multi-channel servers, which also improves the performance of the operating system. In the NetworkWorld test, RHEL5 easily detected dual Athlon CPU in the Polywell 2200S machine, and quickly detected four dual-core Athlon 64 cpu hp 585. In fact, there were no other detection errors except for the strange graphics card geometry problems on Dell's PowerEdge P280 and HP DL140 common servers, the problems mentioned above are also minor issues. Compared with the native RHEL5 test results, the RHEL5 kernel introduced by the Xen hypervisor is affected by a slight increase in latency.

NetworkWorld tests the performance impact of Xen, and finds that the insertion loss of the management program layer and the RHEL5 kernel introduced with Xen is insignificant: the performance is not greatly affected. In the test, two "domU" client operating system named in the Xen statement are generated here.) LMBench3 is run simultaneously in each OS client instance. The performance degrades linearly with the added instance.

To provide hardware vendors with more consistent programming practices, RHEL 5 Xen modified its driver model. One possible result is an open source iSCSI driver. This type of driver enables OS instances to use the virtual storage provided by the ability to connect external storage devices, such as SAN devices managed by iSCSI, through drivers. The driver allows external iSCSI storage devices to be accessed by the operating system as "SAN", thus reducing the number of server hardware. It also provides flexible storage options for system designers-if they have to maintain virtual OS instances in a more organized manner.

Unlike Microsoft and Apple which have added a lot of gorgeous GUI improvements in their operating systems, the GUI is not significantly improved in the RHEL5 server and client version. There is really nothing new in the RHEL 5 Xen user interface, and it still uses Gnome 7.1, but it adds support for high-performance graphics cards and the AIGLX library. The latter imitates the graphic visual effects of some competitive GUI features, including beautifully minimized, transparent/translucent, fade-out, and window operation features.

In terms of other significant changes, the installation time support option has been increased, and RHEL5 has added more complex and comprehensive support for IPv6 in terms of detection and firewall operations.

Conclusion
Sensory attractiveness does not seem to be the focus of this version. On the contrary, in RHEL5, RHEL 5 Xen creates a strong effect in infrastructure in the form of optimized virtualization and user session control. Many components in the operating system still need to be fully integrated with better management tools. However, basic functions are undoubtedly available. The US "Network World" is for the Network community website)

Related Links
How to test RHEL5? NetworkWorld tests the final version of Red Hat RHEL5 in a Gigabit Ethernet IPv4/IPv6 network consisting of a D-Link and an HP switch. The test platform covers a variety of servers, including a HP585 with 4 dual-core AMD Athlon CPU, 12 GB memory, and hp scsi disk array) one HP DL140 with dual 32-bit Intel CPU and 4 GB memory) and one Polywell 2200S server with two single-core Athlon CPU and 4 GB memory) and a Dell P280 with a celon CPU, 4 GB memory, 500 gb scsi hard drive, and fiber channel card ).

NetworkWorld successfully tested the connectivity between NFS4, LDAP, and SAMBA, connect to Windows 2003 Enterprise Server Edition, Apple MacOS 10.4.7 Server Edition, Novell/SUSE Linux 10, Windows Vista Ultimate/XP SP2, MacOS 10.4.7 client, and NetBSD 3. Using LMBench3 on the same hardware as mentioned above Polywell 2200) to test the Xen efficiency. First use the original SMP kernel, then use the Xen kernel managed by the hypervisor, and then use two DomU kernel client instances. These results show a linear decline in performance.

Nowadays, people are demanding more and more computers, so this requires developers to be more and more difficult to develop systems. However, the perfect combination of RHEL 5 Xen has won the praise of many people, speed and security are two aspects that people are most concerned about, while RHEL 5 Xen combines these two aspects perfectly.

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