Linked by Thom Holwerda on Wed 20th Dec 2006 19:20 UTC, submitted by Arcenius
Mac OS X Not too long ago Apple released a new build of Mac OS X 10.5, Leopard, to select testers. AeroXP now has some screenshots of this new build. They report, for one thing, that even though it is available, ZFS is not actually working in this build. Update: ThinkSecret has more screenshots and an overview.
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No "Illuminous" in sight...
by leavengood on Wed 20th Dec 2006 19:55 UTC
leavengood
Member since:
2006-12-13

If Apple really are going to change or update the user interface, there doesn't seem to be any sign of it yet.

I must say I do like the Time Machine icon though, hehe.

I also wonder how Time Machine works and how usable it is. Maybe it works like SubVersion or other source control systems, by keeping a diffed back-up of changed files, so it uses as little space as possible. Still if you are modifying big binary files like images and videos it could get messy. Unless they have some clever binary diffing technique (which is possible.)

Reply Score: 1

RE: No "Illuminous" in sight...
by Adam S on Wed 20th Dec 2006 20:11 in reply to "No "Illuminous" in sight..."
Adam S Member since:
2005-04-01

Actually, I'd argue that the LACK of UI changes is proof they have *something* cooking. Otherwise, I'd expect to see a little more unification.

Reply Parent Score: 1

zbrimhall Member since:
2006-08-21

I'm sorry, but your argument is just silly. It may well be that Apple has some new UI goodies that we won't see till Leopard is released, but please stop taking the absence of a feature that you really want as proof that Apple is hiding something! Let's take an example from a different topic:

It'd be really cool if leprechauns existed. In fact, I've never seen a leprechaun; considering that leprechauns are supposed to be really good at hiding, the fact that I've never seen one must mean they do exist! Yay!

Makes sense? No? I didn't think so.

Reply Parent Score: 1

RE: No "Illuminous" in sight...
by zbrimhall on Wed 20th Dec 2006 20:20 in reply to "No "Illuminous" in sight..."
zbrimhall Member since:
2006-08-21

Exactly how it works is still up for debate. There's been a lot of discussion based on what's been available in the developer previews, but I don't see why Apple couldn't be hiding something cool up their sleeve (such as some not-necessarily-ZFS snapshot-enabled filesystem) to be announced on the release of the final product.

But regarding how it seems to work in the developer previews, John Siracusa blogged about it back in August: http://arstechnica.com/staff/fatbits.ars/2006/8/15/4995 The post is interesting, but here's the really pertinant bit:

"The upshot, as readers probably know by now, is that Time Machine is not an interface to file system snapshots built on any sort of new, modern file system. Instead, it's an automated backup system that works with plain old HFS+. The point-in-time views in Time Machine are actually sparsely populated directory trees on an external disk or server containing mostly hard links to unchanged directories, plus full copies of the few files that have been created or modified since the last backup.

"Apple added traditional hard links (that is, hard links to files) to HFS+ back before Mac OS X 10.0 was released. In Leopard, HFS+ supports hard links to directories as well—an ability wholly alien to any other Unix-like operating system that I can think of. This is how Time Machine builds its sparse trees. The very first backup is a full copy. All subsequent backups contain hard links to the unchanged portions of the previous backup."

Reply Parent Score: 1

leavengood Member since:
2006-12-13

"The very first backup is a full copy. All subsequent backups contain hard links to the unchanged portions of the previous backup."

I figured it was something like that. Nothing particularly amazing, but if it works well, great. Not enough people back up properly (including myself, hahaha.) Plus they have the typically cool Apple UI on it.

Reply Parent Score: 1

Kroc Member since:
2005-11-10

Unfortunately it does look like ZFS won't be actually utilised until Leopard+1/XI. My only concern is if I change a 10GB iMovie project and Time Machine decides to duplicate the whole 10GBs. Not ideal.

Reply Parent Score: 2

RE: No "Illuminous" in sight...
by ThanhLy on Wed 20th Dec 2006 20:56 in reply to "No "Illuminous" in sight..."
ThanhLy Member since:
2006-03-14

I also wonder how Time Machine works and how usable it is. Maybe it works like SubVersion or other source control systems, by keeping a diffed back-up of changed files, so it uses as little space as possible. Still if you are modifying big binary files like images and videos it could get messy. Unless they have some clever binary diffing technique (which is possible.)

Text files are easy to diff because there's a common separator: lines of text. This is not possible with binary files.

What would make more sense is if TM looked at each files modified date. Lots of back up utilities do it this way as well. Regardless of how big your file may be, it's trivial to call a function to get the date it was last modified. Take that and compare it with the copy already backed up and if the former is newer, back it up.

Reply Parent Score: 1