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Storage Tiering

TrueNAS Enterprise
This feature is only available on TrueNAS Enterprise systems.

Storage Tiering is an Enterprise feature that operates as a share-level toggle that lets admin users decide whether to write data to flash performance tiers or regular HDD tiers within a fusion pool at any time.

What is a Fusion Pool?

A fusion pool is a hybrid storage pool that mixes slow, high-capacity spinning hard drives (HDDs) and fast, low-latency solid-state drives (SSDs or NVMes) within a single ZFS storage pool to improve performance. Fusion pools are also known as ZFS allocation classes, ZFS special vdevs, and metadata vdevs (Metadata vdev type on the Pool Manager screen).

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