I just formated the LV with the vz root on it using ext3, and now it works fine: /dev/mapper/md1_raid1-vz on /var/lib/vz type ext3 (rw) No more problems: Feb 15 09:22:08 brequinda kernel: [ 401.386985] warning: `vzctl' uses 32-bit capabilities (legacy support in use) Feb 15 09:22:08 brequinda kernel: [ 401.412070] CT: 202: started So the Problem clearly seems to be related to ext4 and vz, ext4 outside vz works fine