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safer and surer
The "enableRAID" command to change an existing active volume into a RAID slice doesn't always work (diskutil sometimes refuses to do this). The scheme outlined above is also a bit risky, since "enableRAID" rewrites low-level format info on the boot disk -- you should really back up first. Here's a safer and surer way to turn your boot disk into a RAID group without down time and without installing OS X on the new disk.
safer and surer
The task was, get rid of my OSX 10.4.10 dual Mac G5's system drive (it's both a puny 160 Gig and Maxtor - two major strikes) and replace it with a RAID of two 400 Gig Western Digital SATA HDs I freshly bought.
safer and surer
This was very helpful to me and everything worked -- except for the last step when Disk Utility gave an "Unrecognized Filesystem" error and refused to rebuild the new RAID disk.
I finally solved things using Terminal diskutil commands (which worked perfectly) after following the guide by Robin Daugherty I found in http://discussions.apple.com/message.jspa?messageID=5782396#5782396 (modifying Robin's third Terminal command to include the "member" keyword) so the Terminal commands become: diskutil list (to find the partition that is going to be added) diskutil checkRAID (to get the RAID UUID) diskutil addToRAID member <device name> <raid uuid> |
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