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Transparent compression filesystem in conjunction with ext4

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http://serverfault.com – I am trying to test a project that needs compressed storage with use of the ext4 file system since the application I use relies on ext4 features. Are there any production/stable solutions out there for transparent compression on ext4? What I have tried: Ext4 over ZFS volume with compression enabled. This actually had an adverse affect. I tried creating a ZFS volume with lz4 compression enabled and making an ext4 filesystem on /dev/zvol/... but the zfs volume showed double the actual usage and the compression did not seem to have any effect. # du -hs /mnt/test **1.1T** /mnt/test # zfs (HowTos)