Virtualization is an technology using that we can create N number of Virtual Machines top of base machine. Instead of buying multiple servers for multiple applications (each one for application) where application can’t use entire hardware, resource being wasted. Using virtualization share single hardware resource to multiple applications (virtual machines) increase business. Now what is RHEV .? Red Hat Enterprise Virtualization.
Advantages of RHEV
- Cost Saving (By Utilizing hardware resource effectively)
- Data Center Space saving
- Power Usage saving
- Extend the life of installed applications
- Less Maintenance
RHEV = Red Hat Enterprise Virtualization.
What is RHEV
RHEV (Red Hat Enterprise Virtualization) is management software that integrates and manages multiple KVM virtualization hosts and virtual machines. Integrating and managing dozens of virtualization hosts and hundreds of virtual machines with RHEV.
Difference between standalone KVM and Red Hat Enterprise Virtualization
Management of standalone KVM is done using command line virsh and GUI virt – manager. I think that virt – manager is a reference implementation of a library named libvirt, that is to say that it is for testing library functions. The virt – manager that I use every day also can recognize multiple hypervisors at once, but I do not do anything like common resource management or integrated management of UUIDs for various resources. Out of several virtual machines, it is a very useful tool, but it’s very small-scale. When the number of virtual machines exceeds 50 units, the list display of virtual machines is also dangerous
Virtual machine management function
KVM does not have HA functions (virtual machine level high availability implementation) common in virtualization management software, load balancing function of resources across multiple hypervisors, and so on. Such high value added functions are implemented in RHEV which is integrated virtualization management software. By using RHEV, you can also use live migration, HA function, snapshot function linked with storage function and DR function of virtual environment (disaster countermeasure). In addition, the authentication / authorization mechanism such as the right to use the virtual machine can also operate with the authorization mapped to the organization by linking with the external authentication infrastructure such as Active Directory, Red Hat Directory Server and so on.
It is also effective for hardware replacement to RHEL 7 compatible servers. It is also possible to move virtual machines running on the RHEL Hypervisor based on RHEL 6 to the RHEV Hypervisor based on RHEL 7 online by live migration function.
DR (Disaster Recovery) support for storage domain
Previously, in the event that the database of RHEV-M was totally lost, or from the RHEV-M of a different site due to disaster measures, restore the virtual machine using the contents of the storage domain containing the actual data of the virtual machine That did not support it. Even in previous versions, I could build a DR configuration in the RHEV environment, but I also had to synchronize the RHEV-M database with the remote. In this RHEV 4.1, recovery of virtual machines from the storage domain is supported, and flexibility of the system repair method improves in case of emergency. However, please do not forget to back up the RHEV-M database.
Conclusion
With RHEV it is possible to efficiently manage KVM based virtualization resources. If you are considering replacing the virtual environment you are currently using instead of introducing a private cloud, why not consider RHEV as an alternative to OpenStack? RHEV is not the public cloud, OpenStack, RHEV is the best environment to migrate existing applications without cloud support.
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