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10.5: Reconnect Time Machine backup after drive swap
Authored by: only_solutions on Mar 27, '10 04:48:07AM
- do I boot from a different volume when I attempt to change the UUID on my normal boot drive, or can I do it while booted from that volume?

That is probably a good idea in order to avoid potential confusion, although it should not be absolutely necessary. If you do it while running from that same volume, just be sure to complete the change and then restart the system right away so the change will take effect.

- what is the full path to the root of a boot drive?

Just / .

All other volumes are mounted under /Volumes/ . You can find the path by simply dropping a file, folder or even a drive into a Terminal window: The respective path is then automatically inserted into the current input line.

- do I need to log in as root admin, or can I log in via my usual user account?

Calling the respective functions via sudo already takes care of that (your account must be enabled as an admin account for this, and you will be asked for your password on execution). But there is no need to explicitly log in as root.

- is there an easier way to change this UUID?

Not to my knowledge. Normally it is not supposed to be done, so it shouldn't be easy, really. ;-)

I've searched extensively and haven't found references to any of this online - is there a reference book or source, no matter how wonky, that I can but?

I'm not aware of a book (which could well exist), but for some of the background the articles by John Siracusa on ars technica about Mac OS X are quite interesting.

Thanks so much for tolerating me. I can make a dozen major apps dance and sing, but Terminal is NOT one of them.

No problem I always recommend anyone to be careful about treading unfamiliar ground, but I'll try to help where I can. :-)---
There are no problems...

There are no problems...
Edited on Mar 27, '10 04:56:34AM by only_solutions

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10.5: Reconnect Time Machine backup after drive swap
Authored by: rich k on Apr 15, '10 12:08:59PM

Final outcome:
I restored the FSACLCTL command using Pacifist from my 10.5 install disk. I then attempted to change the UUID of the backup sparsebundle file on my Time Capsule. This appeared to work, but didn't.
SO, after running one more CCC backup of my boot drive for safety, I changed my boot drive UUID to match the back up UUID. That nailed it. Unfortunately, in the meantime I had lost many of the older back up iterations as Time Machine, thinking the older backups to be from a different Mac, erased them one by one while methodically bringing the data "up to date". But at least I have back ups from Oct. 09 forward, instead of none at all.
Bottom line - if at all possible, use Time Machine to restore into a new drive, rather than Carbon Copy Cloner or another drive-to-drive copy. But if, like me, that is not an option, and you've been using a network-based backup scheme like a Time Capsule, changing the new drive's UUID will work.

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