Where's my space?

TrueNAS General
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You likely want two 12-wide[1] RAIDZ3 VDEVs: that will bring down your total usable space[2] to around 315 TB[3].

Suggested readings are Introduction to ZFS | TrueNAS Community, iX's ZFS Pool Layout White Paper and Assessing the Potential for Data Loss | TrueNAS Community.

  1. The reccomended maximum width for a single VDEV. ↩︎

  2. usable space = total space - 15% (usually it’s 20%, I personally use 15%). ↩︎

  3. I used ZFS Capacity Calculator - WintelGuy.com for the calculations. ↩︎

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