VPS on OpenVZ

Started by dragon, Sep 11, 2022, 05:01 AM

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dragonTopic starter

I recently read on another forum that advanced VPS owners are switching to a new technology — Xen — instead of the popular OpenVZ.
They write that OpenVZ, compared to Xen, is like a cassette compared to a CD. Yes, I also saw the news here about Xen. So has OpenVZ outlived its usefulness?


The technologies are both interesting and, in principle, necessary for both hosting providers and users.
Personally, my opinion is that XEN will be more reliable, on a personal example, the VPS on OpenVZ works well as long as the VPS on the neighborhood does not create an excessive load that all other users are down.
This won't happen on XEN.

A lot depends on the hosting provider here, if you do not sin with overselling on OpenVZ, then this is practically the same level of quality with Xen.
But how can I not oversell on OpenVZ when there are a large number of clients, and I don't want to expand and take another web server?
You still do not bother anyone as long as there are few customers))) well, or while the iron is in stock unused.

Another question is that most  web hosting providers use OpenVZ to reduce the price, and here of course Xen looks more stable.
And the price sometimes plays a key role for most clients and at first the client will absolutely not care with what virtualization his web server has.


The advantages of XEN virtualization stem from the disadvantages of OpenVZ.
This technology allows you to run dozens of separate OS cores on one server with absolutely insignificant performance losses. And since we get a separate OS core for each VPS, this immediately solves all the problems described above related to OpenVZ.
- You are given full control over the system, up to making the necessary changes to the OS kernel. You can install any OS.
- Memory and disk space are completely at your disposal, which makes the work clear, predictable and reliable. Your file system does not depend on anyone else in any way.
- If you have a virtual server on Xen with 512 MB RAM, then this means that the amount of RAM is 512 MB. Everything is simple and clear.
- The presence of a swap file. Processes using a larger memory value than guaranteed are transferred to the swap file. This causes the system to slow down, but not to destroy the process with the error Cannot allocate memory, as in OpenVZ.
- Isolation from "neighbors". VPS on XEN has no effect on other VPS in the same node.
- Reliability .

- To change resources (memory, location, processor, IP addresses), VPS overload is necessary
- Restarting the VPS takes up to a minute or more.
- More expensive than OpenVZ, because overselling with XEN is impossible in principle.