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Mountain Lion installation on home built Fusion Drive
Authored by: dombi on Nov 05, '12 10:15:18PM

I am also wondering about one thing with the Fusion Drive. What happens if either one of the drives fail? Let's say the HDD fails.

Can you start your Mac at all?
How does the recovery procedure look like with the Fusion Drive?



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Mountain Lion installation on home built Fusion Drive
Authored by: spinkb on Nov 06, '12 01:52:01AM

Its "one drive"...so if part fails, its all broken. You need time machine keeping backups so you can replace the broken part, and recreate the drive structure, and restore again.



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Mountain Lion installation on home built Fusion Drive
Authored by: dombi on Nov 06, '12 02:24:13AM

Well, that kind of makes is difficult to deal with. Especially for users who are not so advanced.
I imagine that the same is true if you want to upgrade the HDD to a larger one.



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Mountain Lion installation on home built Fusion Drive
Authored by: herothedog on Nov 06, '12 09:25:16AM

diskutil shows that both drives have a recovery boot partition. So it seems if one drive fails, one would still be able to boot with the recovery partition.



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Mountain Lion installation on home built Fusion Drive
Authored by: BiL Castine on Nov 07, '12 07:21:12AM

Interesting finding. I was not able to clone a recovery partition to the Fusion drive using CarbonCopyCloner, but I didn't try installing the OS on a blank drive. Good to know Apple's installer already handles Fusion drives in an overly cautious manner. Now to see if i can create recovery partitions on the existing Fusion drive without having to reinstall the OS…



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