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vzstats in beta

For the last two weeks or so we've been working on vzstats -- a way to get some statistics about OpenVZ usage. The system consists of a server, deployed to http://stats.openvz.org/, and clients installed onto OpenVZ machines (hardware nodes). This is currently in beta testing, with 71 servers participating at the moment. If you want to participate, read http://openvz.org/vzstats and run yum install vzstats on your OpenVZ boxes.

So far we have some interesting results. We are not sure how representative they are -- probably they aren't, much more servers are needed to participate-- but nevertheless they are interested. Let's share a few preliminary findings.

First, it looks like almost no one is using 32-bits on the host system anymore. This is reasonable and expected. Indeed, who needs system limited to 4GB of RAM nowdays?

Second, many hosts stay on latest stable RHEL6-based OpenVZ kernel. This is pretty good and above our expectations.

Third, very few run ploop-based containers. We don't understand why. Maybe we should write more about features you get from ploop, such as instant snapshots and improved live migration.

Comments

(Anonymous)
Apr. 30th, 2013 03:29 am (UTC)
Just installed on a SL6 base node I have at home.

Re: ploop, I can see the benefit of having a FS journal per container. Do you have any tips on monitoring the journal blocking to gauge how big of a problem it is for my setup?

Is there a tool to convert a directory based container into a ploop container? That might help in transitioning existing containers (it wouldn't be too hard to work out myself, but if you want people to move over to it, making it as easy as possible will encourage migration).
k001
May. 3rd, 2013 01:32 am (UTC)
> Is there a tool to convert a directory based container into a ploop container?

Yes, it is vzctl convert $CTID. Please set desired --diskspace before doing that.

It is documented in vzctl(8) man page and also here:

http://wiki.openvz.org/Ploop/Getting_started#Converting_an_existing_CT

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