Virtual Server Monitoring with PRTG

Virtualization is the process of creating a virtual version of something like computer hardware. It involves using specialized software to create a virtual or software-created version of a computing resource rather than the actual version of the same resource.

A virtual server is a software-based environment that emulates the functionality of a physical server. It allows multiple virtual servers to run on a single physical server, sharing its resources while operating independently. Overall, virtual servers provide a flexible, efficient, and cost-effective way to manage and deploy server resources.

Virtual servers are created using virtualization technology, which uses software called a hypervisor to create and manage virtual machines (VMs). The hypervisor sits between the hardware and the virtual servers, allocating resources such as CPU, memory, and storage to each VM.

Some advantages of virtual servers include:

• Isolation and independence: Each virtual server operates independently of the others, with its own operating system, applications, and data. This isolation ensures that problems in one virtual server do not affect the others.
• Resource efficiency: Virtual servers make more efficient use of physical server resources by allowing multiple VMs to run on a single piece of hardware. This reduces the need for additional physical servers, saving on costs and space.
• Scalability: Virtual servers can be easily scaled up or down by adjusting the allocated resources or adding more VMs as needed. This flexibility makes it easier to handle varying workloads and growth.
• Cost savings: By consolidating multiple virtual servers onto fewer physical servers, organizations can reduce hardware, energy, and maintenance costs.
• Disaster recovery: Virtual servers can be backed up and replicated more easily than physical servers, improving disaster recovery and business continuity capabilities.

The terms "virtual server" and "virtual machine" (VM) are often used interchangeably, but there are subtle differences between them.

A virtual machine is a broad concept that refers to any instance of an emulated computer. A virtual server is a specific use case of a VM, configured to perform server roles.

Virtual machines can be used for various purposes, including running desktop environments, testing different operating systems, and application development. Virtual servers specifically refer to VMs that are configured and used for server-related tasks.

In summary, all virtual servers are virtual machines, but not all virtual machines are virtual servers. The distinction lies in the intended use and configuration of the virtualized environment.

PRTG is a proprietary software tool that tracks and analyzes the availability and performance of hypervisors, virtual CPUs, virtual disks, RAM, and other virtual server components. Compatible with most major virtualization platforms, PRTG brings together critical health stats in one place, so you can easily optimize performance, troubleshoot issues, and keep your virtual environment running smoothly.

Alongside keeping an eye on critical parameters, it's also worth considering clustering — grouping virtualized servers so they work together as a single system. Clusters intelligently distribute network load, which is handy if your organization has high performance requirements. Clustering also helps avoid situations where there's a single point of failure. If one virtual server stops working, for whatever reason, another server in the cluster will swoop in and take over. 

In PRTG, “sensors” are the basic monitoring elements. One sensor usually monitors one measured value in your network, for example the traffic of a switch port, the CPU load of a server, or the free space on a disk drive. On average, you need about 5-10 sensors per device or one sensor per switch port.