FREMONT, Calif. - eTradeWire -- eRacks Systems today published a free, vendor-neutral guide to choosing a ZFS layout for a network-attached storage (NAS) server. ZFS - the open-source OpenZFS file system used by TrueNAS, Proxmox, and Ubuntu - protects data with checksums and parity, but performance and resilience depend heavily on how the pool is laid out. The guide covers the five layouts eRacks recommends most, and when to use each.

The short version

- RAIDZ2 (double parity - the array survives any two simultaneous drive failures) is the safe default for most 6-to-12-drive systems. Buyers unsure where to start should start here. - Striped mirrors deliver the highest IOPS and fastest resilver (the rebuild after a failed disk is replaced) - the pick for virtual machines and databases. - RAIDZ1 (single parity) is for small or solid-state arrays only; on large spinning disks its resilver window is risky. - RAIDZ3 (triple parity) suits wide vdevs - the group of disks ZFS treats as one unit - and archival storage. - dRAID (distributed parity) restores resilver speed at scale, for arrays of roughly 24 drives and up.

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Beyond the layout

It also covers the devices that make a pool fast without compromising safety: an NVMe special vdev for metadata, a SLOG (separate ZFS intent log) for synchronous writes, an L2ARC read cache, and ample ECC (error-correcting) memory.

Every eRacks NAS is built for ZFS from the ground up: an IT-mode HBA (a host bus adapter that passes each disk straight through to ZFS rather than hiding it behind hardware RAID), ECC memory, and conventional-recording (CMR) drives up to 30TB - never shingled drives, which behave poorly under ZFS resilvering.

The full guide, with a when-to-use-each breakdown, is on the eRacks blog: https://blog.eracks.com/2026/06/zfs-layout-guide-raidz2-mirrors-top-5-nas-configs-jun2026/ . Customers can configure a NAS now at https://eracks.com/products/rackmount-nas-servers/ , and eRacks engineers will spec a layout to the workload at no charge - just describe the use case.

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About eRacks Open Source Systems

eRacks Systems is an open-source server and storage specialist founded in 1999 and based in Fremont, CA. The company designs and builds rackmount servers, NAS, HPC clusters, and AI servers configured to customer requirements, running Linux and open-source software stacks. eRacks.com serves businesses, research institutions, and government agencies worldwide.

Media Contact

Joseph Wolff eRacks Systems joe@eracks.com https://eracks.com