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It is widely know that ZFS can compress and deduplicate. The deduplication works across the pool level and removes duplicate data blocks as they are written to disk. This results into having only unique blocks stored on the disk while the duplicate blocks are shared among the files. There is a good read about how dedupe works and some tweaking things like changing the checksum hashing function. https://blogs.oracle.com/bonwick/entry/zfs_dedup Note: Compression works fine under zfsonlinux but the current version is not yet supporting deduplication (16.09.2014). ZFS on FreeBSD (for example FreeNAS) and Solaris (and Opensolaris) have a higher pool version and support deduplication. Deduplication has been introduced with pool version 31. Zpool versions and features (blogs.oracle.com) List of operating systems supporting ZFS (wikipedia) Now, how to determine if you would actually benefit from deduplicated and compressed datasets? I run the following under FreeNAS with a testsetup filled with real data. (self recorded camera .mov, ISOs, virtual […]

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