I’ve been getting a lot of questions lately from people who are new to the data storage world. And sometimes there’s a bit of confusion surrounding the difference between a RAID controller versus an HBA controller, or “IT mode” controller. In this video, we’re going to compare RAID controllers and HBA controllers. We’ll start by discussing what an HBA SAS controller is and their anatomy. Then, we’ll discuss what a RAID controller is and the components of a RAID controller. We’ll then compare them and talk about their differences and similarities. And finally, we’ll discuss which one is better.

Video index:
0:00 - motivation for this video
0:22 - overview
1:07 - HBA = Host Bus Adapter
2:24 - Anatomy of a Host Bus Adapter
5:35 - RAID = Redundant Array of Independent Disks
7:53 - Anatomy of a RAID SAS controller
10:49 - Comparing RAID vs HBA
13:35 - Comparing RAID vs HBA with ZFS (feature comparison)
16:45 - Comparing RAID vs HBA with ZFS (pros / cons)
19:19 - Which is better? RAID or HBA?

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