JBOD(Just a Bunch of Disks)
A group of drives exposed individually, without hardware RAID combining them.
JBOD is ideal for ZFS or Btrfs, which prefer to manage each disk directly. An HBA or disk shelf presents drives as JBOD to the OS.
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HBA(Host Bus Adapter)
A card that adds many drive ports, commonly flashed to pass disks straight through to ZFS.
ZFS
An advanced filesystem and volume manager offering data integrity, snapshots, compression and software RAID.
RAID(Redundant Array of Independent Disks)
A method of combining multiple drives so they act as one, improving performance and/or protecting against drive failure.