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Eisen Feuer
Sep 3, 2013, 04:28 AM
I've been courting the ability to have my OS installed separately on an SSD with the big stuff (My Users folder) aliased and stored on a HDD.

I'm simultaneously, and VERY tentatively, looking to install Mountain Lion over my long-time Snow Leopard install; my immediate fear being some of my money-making applications will break compatibility upon upgrading.

I'm wondering, to those with a little more advanced knowledge of OS X's inner workings, would it be possible to have a 10.6 and 10.8 install on different Hard Drives, with a shared Users folder stored elsewhere for both? When I was tinkering around with the SSD scenario I found it's possible to boot into OS X with no Users folder at all—thing is, can something be changed by 10.8 in the users folder that would make it corrupt/invisible/unusable by 10.6, or vice versa? For example, the Applications folder is tied to the system with supporting data in /Library/Application Support and /Library/Preferences. These things would change as I messed with the apps I presume, meanwhile I would have unchanging data in home/Library.



Embio
Sep 3, 2013, 05:02 AM
I've only ever done this between 10.6 and 10.7, 10.7 and 10.8 etc. The only time things have broken a little bit is between 10.8 and 10.9. By 'broken' I mean I needed to fix permissions a couple of times on reboot in 10.9.

If the program is relatively lightweight you can also run 10.6 in VMware/Parallels/Virtual Box

Eisen Feuer
Sep 3, 2013, 05:14 AM
The main program, Nuke (http://www.thefoundry.co.uk/products/nuke/), is the exact opposite of lightweight. It's super picky about GPUs and is the only program that can fill my 32GB of RAM to the brim in less than a minute.

I'm upgrading to 10.8 only because I'm having (documented) system+OS issues that make Adobe Premiere CS6 crash mercilessly, as well as the fact that I'm missing out on a lot of shiny new software that's left the stable perfection of Snow Kitty behind...

Bear
Sep 3, 2013, 07:56 AM
...
I'm wondering, to those with a little more advanced knowledge of OS X's inner workings, would it be possible to have a 10.6 and 10.8 install on different Hard Drives, with a shared Users folder stored elsewhere for both?
...The issue you will run in to is where the preferences for something included with OS X are different enough that it causes issues switching back and forth. Apple Mail will be a real issue if you run it under both versions of OS X - there were changes to how it stores mail on your disk. And if you need different versions of a non-Apple application there could be preference issues as well.

It could work fine, but I wouldn't bet on it for something that was where I made my money.

Eisen Feuer
Sep 3, 2013, 10:46 AM
Thank you that's exactly the answer I was looking for. I know how I'll approach this from here on out