On February 4, 2010 12:12:04 PM +0100 dick hoogendijk <d...@nagual.nl>
wrote:
Why don't you just export that directory with NFS (rw) to your sparse zone
and mount it on /usr/perl5/mumble ? Or is this too simple a thought?
On February 4, 2010 1:41:20 PM +0100 Thomas Maier-Komor
<tho...@maier-komor.de> wrote:
What about lofs? I thinks lofs is the equivalent for unionfs on Solaris.
The problem with both of those solutions is a) writes will overwrite the
original filesystem data and b) writes will be visible to everyone else.
Neither suggestion provides unionfs capability.
On February 4, 2010 12:12:18 PM +0000 Peter Tribble
<peter.trib...@gmail.com> wrote:
The way I normally do this is to (in the global zone) symlink
/usr/perl5/mumble to somewhere that would be writable such as /opt, and
then put what you need into that location in the zone. Leaves a dangling
symlink in the global zone and other zones, but that's relatively
harmless.
The problem with that is you don't see the underlying data that exists
in the global zone. I do use that technique for other data (e.g. the
entire /usr/local hierarchy), but it doesn't meet my desired needs in
this case.
I looked into clones (and at least now I understand them much better
than before) and they *almost* provide the functionality I want. I
could mount a clone in the zoned version of /foo and it would see the
original /foo, and changes would go to the clone only, just like a real
unionfs.
What it's lacking though is that when the underlying filesystem changes
(in the global zone), those changes don't percolate up to the clone.
The clone's base view of files is from the snapshot it was generated
from, which cannot change. It would be great if you could re-target
(or re-base?) a clone from a different snapshot than the one it was
originally generated from. Since I don't need realtime updates, for
my purposes that would be a great equivalent to a true unionfs.
So the thread on zfs diff gave me an idea; I will use clones and will
write a 'zfs diff'-like tool. When the original /usr/perl5/mumble
changes I will use that to pick out files that are different in the
clone and populate a new clone with them.
-frank
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