Step 2 - Remove the failed drive from the RAID 1 You will need this data in order to remove the failed drive from the RAID, as well to rebuild the RAID. Please note the Unique ID of the RAID (Figure B), the Device Node disk number (Figure C), and the UUID from the failed disk (Figure D) for later use. The Status for the disk may display Missing/Damaged or Failed.
The Status for the RAID displays that it is Degraded. These steps will demonstrate how to identify which drive has failed from the array:įrom the Desktop, select Go from the top menu bar, then Utilities > Terminal. Please follow this procedure to check the RAID status and rebuild the RAID 1:
When one drive in a RAID 1 fails, it may need to be replaced. Proceed only when your computer has started normally. IMPORTANT! Do not attempt the following while your Mac is in Recovery Mode. IMPORTANT! Before proceeding, please safely eject and then physically disconnect all external storage devices (external hard drives, SD cards, etc) from your Mac computer, except the device on which you want to create the RAID. This article provides instructions to rebuild a RAID 1 using the Mac OS Terminal.
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