There's been talk on a forum about how advanced VPS owners are transitioning from OpenVZ, a popular virtualization technology, to Xen.
According to them, the difference between the two is like that of a cassette and a CD.
Interestingly, I came across news here about the rise of Xen. It begs the question: has OpenVZ become obsolete?

Both hosting providers and users require reliable and efficient technologies, and it seems that both OpenVZ and Xen have their benefits.
However, many believe that Xen is a more dependable option. Unlike OpenVZ, which can be impacted by excessive load from other users, Xen remains stable even during heavy usage.

That being said, the quality of performance ultimately depends on the hosting provider. While overselling on OpenVZ can diminish its effectiveness, a responsible provider can still offer comparable performance to Xen.
The issue becomes more complicated when considering how many providers use OpenVZ primarily to keep costs down. Although Xen appears to be a safer choice, price is often the bottom line for many clients.

It's important to weigh the pros and cons when choosing a virtualization technology, especially as hosting needs continue to grow. It's also worth considering investing in additional resources if overselling becomes an issue, to ensure consistently high-quality performance.

XEN virtualization is favored for its unique benefits, often an alternative to OpenVZ's drawbacks. With XEN, it's possible to operate numerous separate OS cores on a single server without suffering from performance issues. Each VPS, with its own OS core, avoids any previous concerns associated with OpenVZ.

XEN offers a greater degree of control over system modifications, such as installing any OS desired. Additionally, memory and disk space are completely user-controlled, improving the reliability and predictability of file systems. A swap file is available and processes that exceed guaranteed memory will not collapse the system entirely - unlike with OpenVZ.

Other advantages include isolation from other VPS on the same node and heightened reliability.
Nevertheless, XEN has its downsides as well. Overloading is necessary to change resources like memory, location, processor, and IP addresses. Restarting the VPS can take over a minute, making changes time-consuming. Finally, XEN is more expensive than OpenVZ due to its inability to oversell.

Purchasing a VPS can be complex, as different virtualization technologies entail specific advantages and disadvantages. Decision-makers must balance price, reliability, overhead, and more to ensure the most suitable option for their needs.