Filesystem fragmentation is long standing and well known problem. Modern filesystems has effective techniques and tools to minimize fragmentation and aging effects. But filesystem aging can not be avoided completely. This is true for all filesystems: ext4,xfs,btrfs,zfs,logfs,etc. This becomes a very serious problem for container/cloud solutions because most solutions use thin-provision storage. This talk overview existing techniques, our experience and new tools we develop for OpenVZ project