Hi LuKreme, I tried to follow your instructions for rebuilding my RAID, but I had problems.
I replaced the failing drive with an identical one and powered up the enclosure. I opened Disk Utility, and chose the missing drive, but I could not find anything about "Demote". There was an option for "Delete" and I chose that, but I was unable to drag the new disk to the RAID set. And the "Rebuild" option was grayed out. Here are a few things that may complicate things: 1. This was a RAID10 configuration, in which I first created 2 pairs of mirrors and then striped them. Perhaps that configuration does not allow one to demote a drive or rebuild the RAID. 2. Before I created the RAID10, I partitioned each of the 4 drives into a big partition and a small partition. I created the RAID10 from the 4 large partitions. Perhaps your suggestion does not apply when partitions rather than entire disks are used to create the RAID. For now, I ended up putting the failing drive back in the enclosure. Do you have any other ideas about how to rebuild my RAID? I noticed that there was an option to automatically rebuild. It was a box that I could have checked when I first set up the RAID. Perhaps I should have selected that option. It looked like I could still check the box, but I did not want to mess things up further, so for now I left it unchecked. Please let me know if you have any other suggestions. Thanks, Gregg On Nov 10, 2014, at 2:12 PM, LuKreme <krem...@kreme.com> wrote: > On Nov 9, 2014, at 9:26 PM, Dinse, Gregg (NIH/NIEHS) [C] > <di...@niehs.nih.gov> wrote: >> >> What is the best way to "fix" the RAID10 array? > > Unmount the RAID, Turn off the enclosure. Remove the failing drive, replace > it with an identical drive, turn on the enclosure. > > Open up Disk Utility. Choose the missing drive on the left and then “Demote”. > > Drag the new disk into the raid set and chose “Rebuild”. > > You can also do it from the command line: > > sudo diskutil list > sudo diskutil appleraid list > sudo diskutil appleraid add member <disk4> <RAID-UUID> > > where disk4 is the new disk you just added and UUID is the UUID of the RAID > set. > > Note the UUID of the failed disk (listed in the appleraid list above) and > then: > > diskutil appleraid remove DISK-UUID RAID-UUID > > There is no need to turn off the computer. _______________________________________________ MacOSX-talk mailing list MacOSX-talk@omnigroup.com http://www.omnigroup.com/mailman/listinfo/macosx-talk
