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Support for VZFS-based Containers Being Phased Out of Virtuozzo (formerly Parallels Cloud Server)

Last Updated: Jul 24, 2016 07:51PM UTC


With the Parallels Cloud Server 6.0 SP1 release, we will continue to support containers based on the VZFS file format. However, support for VZFS will be dropped in the upcoming release of Parallels Cloud Server 7. It is highly recommended when migrating a container from Parallels Virtuozzo Containers for Linux to Parallels Cloud Server that you move to the “Container in a file” (ploop) format. If there are existing Parallels Cloud Server containers still using VZFS, they will continue to operate with Parallels Cloud Server 6.0 SP1 but we highly recommend you migrate them to ploop- based containers over the course of the next year.

With the release of Parallels Cloud Server 6.0 SP1 we have done several things to help with the migration from VZFS to ploop. For existing Parallels Cloud Server containers based on VZFS, online conversion to ploop-based containers is now supported. It should be noted that the conversion to ploop does require slightly more disk space, however ploop provides the following benefits:

  • The ability to take consistent snapshots of the container file system, which you can use for incremental backups or provide to end users for test purposes.
  • The ability to make backups on top of snapshots using conventional cp or tar, rather than requiring special backup tools like Acronis True Image.
  • A significant reduction in the time required to back up and migrate containers, since sequential reading of a single image is an order of magnitude faster than reading multiple separate small files on rotational drives.

If you have containers deployed today based on VZFS we recommend moving to ploop-based containers as part of the upgrade to Parallels Cloud Server. Prior to this upgrade you should make sure the container is using the latest version of VZFS

Lastly, if you have containers deployed today based on VZFS and you are not ready to upgrade to Parallels Cloud Server, you can run an in-place upgrade on the Parallels Virtuozzo Containers for Linux servers, however this will require some downtime. Right after that upgrade you will be able to do an online conversion from VZFS to ploop.

Additional information

Article #2352878 Migration of VZFS container to PCS6 fails: "Can't migrate this private area on shared FS (old layout)"

Article #2352879 How to convert VZFS4 containers to ploop format

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