Mailing Lists: Apple Mailing Lists
Image of Mac OS face in stamp
 
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: Java 1.3: 10.1 vs. Jaguar

Paul Heiney <email@hidden> wrote:

>My understanding, from something I saw on this list a while ago, is that
>having multiple 10.x OS's on the same machine has some problems--files
>expect to be in a certain place. Is it really feasible to make a backup
>of 10.1 onto a different partition and actually run from that if
>10.2.1 doesn't behave as hoped?

That's exactly what I did, and it works fine on my model-A gual-G4. YMMV.
In particular, it may depend on exactly what machine you have, and whether
it has constraints on where the bootable files are located on the HD. Some
older punier machines can't boot if the files aren't in the first 8GB of
the physical HD space. See Macintouch for the saga:
<http://www.macintouch.com/mosxreader10.2pt33.html>

I cloned my 10.1 partition with Carbon Copy Cloner, then updated it to 10.2
and 10.2.1 and 10.2 DevTools. I haven't seen any problems switching back
and forth. What DOES NOT work is to attempt to install two bootable X's
WITHOUT using partitions (or separate HDs, of course).

It happens that I put in a new HD to hold all my 10.2 stuff, but before
that I was using a single 40GB HD with 4 partitions, and had no trouble
booting into 10.1 or 10.0, which were both bootable. Somewhere in there
was a bootable 9.2.1, too, but it's been so long since I did that I can't
tell you where it is (partitioned or not).

One critical thing to be aware of with dual-boot partitions is that you'll
have two sets of user-accounts, unless you specifically arrange for at
least one bootable version's login-directories to point to a shared set. I
was prepared to do this if 10.2 got difficult, but I haven't done it yet
and probably won't (if you do, NetInfo Manager is your omnipotent friend).

Another possibility is to not even try to maintain parallel 10.1 and 10.2
user-accounts, just blow off the 10.1 accounts as transient. I'd keep one
admin account, but transfer everything else to an account named
"transient", specifically to remind me not to do any serious work under it.
You can use 'sudo chown -R' to change ownership, but read 'man chown'
first. You can tweak the numeric user-IDs, too, so they match what you
have in your main bootable partition (NetInfo Manager is still your friend).

You can also create big disk-images holding work-files (but not bootable
images or accounts), and use them as pseudo-partitions. They aren't quite
the same as a real partition, though, but they are dead simple to make
full-backups of. They're great for testing, too, because you can format as
MS-DOS or UFS or old-HFS and see if things work as you expect.

Remember, the main reason to preserve 10.1 is for testing, after you've
made the transition to 10.2. Or vice versa if you decide not to make the
transition. That is, you should mainly work under one bootable version,
and only boot the other one to run tests under. One is your "everyday
vehicle" and the other is your "experimental vehicle".

-- GG
_______________________________________________
java-dev mailing list | email@hidden
Help/Unsubscribe/Archives: http://www.lists.apple.com/mailman/listinfo/java-dev
Be sure to read the FAQ http://developer.apple.com/java/faq/ before posting
Do not post admin requests to the list. They will be ignored.


Visit the Apple Store online or at retail locations.
1-800-MY-APPLE

Contact Apple | Terms of Use | Privacy Policy

Copyright © 2007 Apple Inc. All rights reserved.