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I am moving a tar.gz archive between servers and had to note that when extracting the archive a large amount of additional disk space is used. My original data size is 12G, 7.8G compressed and consumes an excess of 57G. I am copying from a zfs file-system to an ext4. Does anyone know if this issue is related to tar or to the file-systems used?

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Ok, it appears the zfs file-system had compression enabled, which reduced the size of the archive by approximately 5 times. Zfs uses transparent compression (LZJB) and you can find more details here.

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