SymptomsAfter finishing specific system upgrade from OpenVZ to Parallels Virtuozzo Containers 4.0 we have found that all Containers were not converted from SIMFS to VZFS, and therefore they were down.
In order to convert SIMFS filesystem of the previous OpenVZ Containers to PVC 4.0 format (VZFS) please run the following script on the affected server:
After that please start affected Containers, e.g. for Container #101:
# vzctl start 101
Or you may just restart Virtuozzo service in order to start all Containers at once:
# service vz restart
Keywords: OpenVZ, SIMFS, failed upgrade.