In setting up my Xserve I chose to create 3 different partitions:
1) System
2) Everything which is more or less dynamic
3) User data
Sounds like you're a sysadmin from Linux or another unice.
I do have some unix history before osx came up, yes.
It wasn't an insult, it's just that it expresses a way of thinking.
In Mac OS X it's actually preferable to have a single volume in most
cases.
Certain performance enhancements in the filesystem favor the boot volume.
OK, I was not aware of this, can you point me to a list/reference of
such enhancements?
You can read the developer docs or the source code.
The dynamic pager has become better and better and should never use
up all available disk space. You can configure other programs and
system components to use disk space on other volumes rather than /
or /var, et al.
That was what I was looking for indeed. I hoped somebody already had
an installation log of such changes, which would ease my search. No
need to reinvent the wheel...
They are purely dependent on what you move where and how.
Starting with swapfiles, I noticed that if I change to location of
the swapdie in /etc/rc just the system volume is mounted and
therefore I cannot select a different location.
This is correct. But you should never be editing /etc/rc. Your
changes will get clobbered, and even Apple is moving from /etc/rc
so this is clearly not the right place.
That makes sense, it is just that I was trying to relocate the VM,
which seems logical to do at the place where the VM is actually
started.
But this ignores that other things like mach bootstrap daemons are
also occurring. It's hear, for instance, that diskarbitration is
started which is what coordinates the mounting of filesytems. And
it's launchd that's started rc (and just about everything else.) So
the order which things occur in rc isn't as you'd expect from other
rc based OSen.
Altogether I am a bit confused when and where the non-system
volumes are mounted?
Volumes are automatically mounted when available in OS X, you don't
need to do anything, if they are online the system will load kernel
extensions necessary to support them and any initialization, and it
will all "just work."
I like UNIX, because if you dig deep you can find everything. Things
don't "just work", there is a reason why it works. I like to learn
how to get a better understanding of the system.
It's how the kernel and diskarbitration work.
Together with all the other advise to not split things the way I
intended, I'm now considering to make a big system partition (150GB)
and setup an early warning if it get's too full.
This is a better idea. You can also teach many things not to use all
the disk space, and VM certainly won't.
--
-dhan
------------------------------------------------------------------------
Dan Shoop AIM: iWiring
Systems & Networks Architect http://www.iwiring.net/
email@hidden http://www.ustsvs.com/
iWiring provides systems and networks support for Mac OS X, unix, and
Open Source application technologies at affordable rates.
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