Another small new feature is ploop-related. When you start (or mount) a ploop-based container, fsck for its inner filesystem is executed. This mimics the way a real server works -- it runs fsck on boot. Now, there is a 1/30 or so probability that fsck will actually do filesystem check (it does that every Nth mount, where N is about 30 and can be edited with tune2fs). For a large container, fsck could be a long operation, so when we start containers on boot from the /etc/init.d/vz initscript, we skip such check to not delay containers start-up. This is implemented as a new --skip-fsck option to vzctl start.