| Headlines |
| 2024-11-06 |
ZFS gains faster deduplication and RAIDZ expansion |
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The TrueNAS project has published a blog post which provides an overview of new ZFS features. The advanced filesystem has recently gained some practical features such as faster deduplication, slowly expanding RAID arrays, and direct I/O performance improvements. RAID expansion is probably one of the most requested ZFS features and its process is decribed in the post: "A much-anticipated feature for smaller systems and home users of TrueNAS, RAIDZ expansion allows a small pool (e.g., a single RAIDZ vdev) to be gradually expanded with one drive at a time. Existing data is preserved with its original parity level and rewritten across all drives, while new data is written with the new parity configuration. This simplified administrative process gives smaller TrueNAS systems the flexibility to expand in single drive increments, rather than adding a full vdev of drives. The same expansion feature works regardless of the parity level used – RAIDZ1, Z2, or Z3 – but cannot migrate between protection levels. The expansion process is done while the ZFS pool is online, similar to the resilvering process when a drive fails and is replaced. Once completed, the larger pool’s full performance is available. The new disk is used immediately, with additional capacity being reclaimed as existing data is rewritten." |
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