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JC2004 Author

Level 1

23 points

Mac Pro RAID1 problem

I've been running two 1TB internal discs as a RAID1 array. It suddenly stopped working. In disc Utility one of the discs is 'Missing' (presumably died) the second disc is marked as 'Online' but I cant access it. I've tried to 'Repair' it but it fails and I get the message "com.apple.StorageKit error 118". I'm bothered about getting the RAID up and running but I do need to at least retreive the Data.

I did consider Disk Warrior but I'm not sure if it would be any help in this situation.

Any suggestions gratefully received.

Thanks John.

Spec: MacPro 2 x 2.4 GHz Quad Core (2010) running Mojave 10.14.6

Mac Pro

Posted on Jun 25, 2021 2:39 PM

Top-ranking reply

HWTech

Level 9

60,662 points

Posted on Jun 28, 2021 11:55 AM

Within Disk Utility click "View" and select "Show All Devices" so that the physical drives and hidden Containers appear on the left pane of Disk Utility. This may give you more options to select for First Aid.

If the RAID volume is APFS, then Disk Warrior will not be able to help you since there are no third party utilities available to repair an APFS volume since Apple has not released the necessary APFS documentation yet.

If the RAID volume is an HFS+ volume, then you should be able to run Disk Warrior on it although you may want to check the Disk Warrior documentation just to be safe that it supports a software RAID (I think it does).

Keep in mind a RAID is not a backup. You should always have frequent and regular backups of your computer and any external medial which contains important and unique data. RAID is only meant to allow you to continue accessing your data while you replace a bad drive and hope the other drive doesn't fail before the rebuild is complete.

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Mac Pro RAID1 problem

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