Dell PERC 6/i non raid mode?

WAIT, I might have read it wrong!

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Yes that controller should be fine. For ZFS you need a controller that can be set to JBOD mode, (Just a Bunch Of Disks), according to the Dell website that controller can be.

Computers, Monitors & Technology Solutions | Dell UK this is the page for that controller, check with controller you have and see if the table says it support JBOD