Mac Mini Server RAID mess up

This is a follow up to a previous thread of mine. Previously, the Mac mini server (2009, 3,1 I believe) would not boot. The Apple logo and the spinning wheel would appear forever.


I found the boot disk and a USB optical drive and so I went into disk utility. I had software RAID 1 set up. Both of the HDDs were fine, physically, but the RAID set said it was "degraded" and one of the volumes said it failed. I tried rebuilding it but that failed. I did not try deleting the failed volume, instead, I deleted the entire RAID set, thinking I would be able to boot the disks as standalone. Instead, neither volumes are mounted, they will not mount when I click mount, and when I turn on the machine I now get the folder with the ?. No volumes appear when I hold down the option key while booting. I tried mounting the disks from the terminal and it said they were mounted successfully, but they were not. I must be missing something in the commands, I don't know them well. I tried creating a new RAID array but it said all data would be erased. At one point both RAID volumes said they were failed, and then the RAID array would either not appear or show up as Offline as opposed to Degraded.


Have I screwed myself by deleting the raid array? Both drives are unmounted and their partition type is "Apple_RAID_Offline"


Can I repair this and save my data?

Mac mini, OS X Server, Mountain Lion

Posted on Jul 7, 2016 6:52 PM

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7 replies

Jul 9, 2016 11:49 AM in response to Shredder2600

I fixed the drives not being mounted or named myself. They are (were) mounted as independent non-RAID drives. However, Disk Utility said they needed to be repaired and could not repair either of them. Disk Utility also told me to backup my files and wipe the drives. How can I backup my files if I can't boot the machine? There's no Finder on the Mac OS X Server install disk.


Any suggestions?


Solution to drives being unmounted: https://www.27partners.com/2010/07/repairing-appleraid/

Jul 9, 2016 12:37 PM in response to Shredder2600

You can try copying data from the drives via Terminal:

Copying Files to External Hard Drive via Terminal?


Do you have another Mac with FireWire? If so the you can connect the two via FireWire, boot the Mini in Target Disk Mode (boot with T key depressed), and boot the other Mac normally and try to access the Mini's disk via Finder.

How to use and troubleshoot FireWire target disk mode - Apple Support

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Mac Mini Server RAID mess up

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