I'd like to hear from anyone that has done a dual boot setup for 10.7.5 and 10.9.4.
Getting two different partitions for the root isn't a big deal. The big issues that I am currently seeing: 1. /Applications: It's safe to assume that anything provided by Apple here will be OS version specific, so I'm leaving this on the root partition. I don't normally install anything into this directory myself. 2. /Users: I have, until recently, made this a symlink to /Volumes/UserData/Users. Recently, I ran into issues looking inside time machine: and my solution was to make a symlink from /UserData to "Volumes/UserData", and then /Users becomes a link to "../UserData/Users" -- a setup that works from both normal bootup and from Time Machine. However, while upgrading that 10.7.5 instance to 10.9.3, sandbox triggered all sorts of errors on /Users/... -- so has anyone managed to get a second partition for user data working in 10.9.3? The issue seemed to be that since it was pointing outside of the defined sandbox (the destination of the link), it was an error and denied. 3. My next idea is to only re-direct my own home directory, instead of all of /Users. I'm not sure if this is better done by using chpass to change my home directory explicitly, or if I should just make a single symlink from /Users/michael to the second partition. 4. Once I have that home directory happy in 10.9.4, the question is, what files/directories in ~/Library are OS version specific? What about applications that I install in ~/Applications that are OS version specific? (I have at least 3 already). My current thinking: Anything that is OS specific will get a symlink to /BootVers/...; "/BootVers" will be a symlink into the user partition, and the link will point to a different directory for each boot. Has anyone done this before me (has to be someone out there, right?)? 10.10 is out in dev preview, and my "real soon now" goal is to set up another boot partition for it ... so this is the "trial run" for that.
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