How to configure a software RAID in macOS Sierra’s Disk Utility
In macOS Sierra’s Disk Utility (version 16.0, if you’re keeping track), the RAID features are back. At least they’re back in the macos Sierra Public Beta. There’s always a chance that Apple will pull the RAID features in subsequent releases, but there’s a good chance they’re here to stay. This article will be updated as beta updates are released, as well as when Sierra is officially released in the fall.
Here’s how to set up and configure a software RAID using macOS Sierra’s Disk Utility. You can use Disk Utility if you, say, bought a multi-bay drive chassis and have filled it with spare hard drive mechanisms you had sitting in storage. Or you already have a RAID array and need to reconfigure it.
(In case you’re wondering, a software RAID is one where the Mac manages the RAID. A hardware RAID is a RAID array that includes a separate computer that manages the RAID. Learn more about hardware RAIDs. If you’re new to software RAIDs, here’s how to get started with the storage devices, then come back to this article 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. Back up that data if you want to save it.
- After you connect your storage devices to your Mac, launch Disk Utility. It’s located in the Utilities folder, which resides in your Applications folder. You can also press Shift-Command-U or select the Go > Utilities menu while in the Finder.
- 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.
- 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.
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.
When setting up a RAID 1, you have to decide if a drive should be a RAID Slice or a Spare. A RAID Slice means the drive is an active part of the array and mirrors your data. A Spare is a drive that sits in waiting until a Slice fails, then data is mirrored to the spare automatically. If you have two drives, they each need to be set as RAID Slice. If you have more than two, you can set one as Spare.
Click the Next button after you’ve selected your disks.
Once you click Next, your Mac will start to configure your RAID array, so don’t click it until you are ready.
When the setup is done, you should see the screen below, and your RAID will be available for you to use.
from Macworld http://ift.tt/29XTRkj