Harry Putnam wrote:
Harry Putnam <[email protected]> writes:
Create a clone of the current environment and never touch it.
Thanks for that reference to `copy on write (COW)'. This is my first
brush with those concepts which I am finding good discussion of with
google. I'll admit I don't fully understand it yet.
But correct me if I have this wrong.
The miss-named `clone', is not stand alone (Something one would
expect from a `clone'). That is, it relies still on the parent if
called into duty. Is that right?
Could you move(mv) the clone to a new disc and boot it up? Or does
the COW kick in during mv... I'm not clear what happens.
BZZZZZT => wrong:
Similar with the `snapshot'. It sounds like an OS frozen in time when
the shutter snapped. But can you move it to a new disc and boot up?
On further consideration I need to drop this about snapshot.. After
all, applying the term to real photographic snapshots, one would never
expect a real snapshot to have the capabilities of the subject of the
snap.
So poor analagy... deeply flawed.
But what about `clone'? It seems my reasoning stands on that.
_______________________________________________
indiana-discuss mailing list
[email protected]
http://mail.opensolaris.org/mailman/listinfo/indiana-discuss
A clone is part of the zpool; it can only be copied elsewhere,
not moved.
A snapshot is the filesystem state at a moment in time. Such
snapshots can be cloned, and then the clone can be modified.
This is like a sci-fi movie, where you can take a picture,
create a working world from the picture, and then step into it.
Hmmm... fun plot... it has potential at a variety of levels :-).
Anyway, the resulting clone shares all unmodified blocks w/ original
snapshot, which shares them w/ the original FS.
This is really ZFS details, not Indiana, though. You may find
zfs-discuss a more appropo list...
- Bart
--
Bart Smaalders Solaris Kernel Performance
[email protected] http://blogs.sun.com/barts
"You will contribute more with mercurial than with thunderbird."
_______________________________________________
indiana-discuss mailing list
[email protected]
http://mail.opensolaris.org/mailman/listinfo/indiana-discuss
