vdev expansion

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    replacing HDDs and expanding pool

    Hi All, Noob here! built this NAS on centoOS in 2012, with 4x2T drives (WD caviar green, 64MB cache). recently migrated to FreeNAS-11.2-U6. two of those drives have errors (offline or unreadable sectors). I bought two replacements: seagate barracuda 7200rpm, 256MB cache. Of my ~3.5T...