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I've been running two software RAID-1 arrays on my OS X Lion Server for quite some time for backup and data storage purposes. At the time, I went for software RAID so that I didn't have to rely on any particular hardware. This worked great for me, but I've been thinking more and more that for my purposes, I did not need a RAID-1 array, what I needed was a separate, stand-alone offline mirror of my drives. This required me to break the RAID-1 arrays up into their individual volumes, this is how I did it.
I've already done my 'work' and 'backup' RAID sets, the last and the largest was the 'data' set. In Disk Utility
, this is what it looked like. Two 2Tb disks.
Note: At this point, I did a full back up of the data, just in case something went wrong. I'd advise the same if you are going to try this.
With the RAID Set selected, I clicked one of the disks in the array. This selected the RAID slice for me.
Then, I clicked Delete
and confirmed the option.
After a short pause, Disk Utility
refreshed, the RAID Set was no longer there; the two individual disks were present as expected. Since this was a mirrored set, each of the volumes is an identical copy.
Then, I shut down, removed the 'spare' disk and booted up again, Disk Utility
is showing just the one disk as expected.
A quick check of the disk showed no errors, success!
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