How to configure a software RAID in macOS Sierra’s Disk Utility

The ability to set up a software RAID has returned to Apple’s utility.


Apple’s disk utility is normally the pass to app for reformatting, partitioning, and diagnosing storage devices for your mac. For decades, the disk utility app stayed the same in terms of features and person interface. But that modified with os x el Capitan; disk utility got a primary facelift, and it additionally had its feature set modified. One of the most important changes turned into that apple removed any capability to set up and configure a redundant array of impartial disks (raid). You had to turn to a 3rd-party app to accomplish that.

In MacOS sierra’s disk application (version 16.Zero, in case you’re maintaining song), the raid capabilities are again. Here’s how to installation and configure a software program raid using MacOS sierra’s disk utility. You could use disk application in case you, say, bought a multi-bay force chassis and feature stuffed it with spare hard drive mechanisms you had sitting in storage. Or you already have a raid array and want to reconfigure it.

(in case you’re thinking, a software raid is one in which the mac manages the raid. A hardware raid is a raid array that includes a separate laptop that manages the raid. Analyze extra approximate hardware raids. If you’re new to software raids, here’s the way to get began with the garage devices, then come lower back to this text to set up the raid.)

How to set up a RAID in macOS Sierra’s Disk Utility

This will erase any data that exists on the disks you want to use for the RAID. Backup that data if you want to save it.

  1. After you connect your storage devices to your Mac, launch Disk Utility. It’s located in the Utility folder, which resides in your Applications folder. You can also press Shift-Command-U or select the Go > Utility menu while in the Finder.
  2. With Disk Utility open, you should see the main window. To get to the RAID tools, click on the File menu and select RAID Assistant.
  3. kako3-On the opening screen of the RAID Assistant, you select the RAID type. Which one should you choose?
    • (Striped) RAID 0: This one’s all about speed. It doesn’t offer data protection, so you’ll need to rely on another backup system, like Time Machine. But if backup isn’t an issue and you need the performance, go with RAID 0.
    • (Mirrored) RAID 1: The same data is written to all the drives. If a drive fails, your data is intact. When your Mac needs to read a file, the performance is faster because the data can be read by multiple drives.
    • Concatenated (JBOD): This simply takes your drives and uses them to create one storage volume. It doesn’t offer data protection or better speed.


Choose your type, then click Next.

  1. The next step is to select your storage devices. Disk Utility will show the drives eligible for the RAID format you select. The app shows the disk, and underneath each disk is a list of the partitions on that device. (When you take the space of a storage device and divide it during formatting, you are creating partitions.)

    Click on the checkbox next to the disks you want to include in the RAID. When you select a disk, all the partitions are automatically selected.

bs-kkar     2-Now you need to set the properties for your RAID.

  • Name: Give your RAID a name, like you would your hard drive.
  • Format: Most people should select Mac OS Extended (Journaled). Select Mac OS Extended (Case-Sensitive, Journaled) if you want files with the same name but with different case treatments (Science Report.txt and science report.txt, for example) to be saved as separate files.
  • Type: This is what you selected back at the beginning of the procedure. To change it you have to start over.
  • Capacity: This is based on the drives you selected in the previous step.
  • Chunk size: Since data is written across drives, it is broken into pieces. Chuck size determines the size of those pieces. If you work with large files, like with video or 3D graphics, choose 128K or 256K. If you are a more general purpose user who does email, writes, or works in spreadsheets or databases, choose 32K or 64K.
  • If you are building a RAID 1, you’ll see an option to “Automatically rebuild.” This means that if a drive is removed and then replaced, the data will automatically be restored to the new drive. Check this box if you want this option. If you don’t, you rebuild the RAID using the Disk Utility app.


Once you click Next, your Mac will start to configure your RAID array, so don’t click it until you are ready.

3-Double-check your properties, then click Next. You’ll see a screen like the one below as your Mac goes to work           configuring your RAID. This involves reformatting and partitions your disks and creating the RAID.


When the setup is done, you should see the screen below, and your RAID will be available for you to use.