On Sun, Mar 31, 2013 at 6:18 AM, Stefano Mori <[email protected]> wrote: > > On 30 Mar 2013, at 18:23, Arno Hautala <[email protected]> wrote: > > I wondered about the hard linked directories, but couldn't imagine how that > got past the need to unlink thousands of files. Is there some interesting > algorithm in there?
By hard linking a directory, there isn't a need to link any of the files contained in that directory. Think about your Applications folder, which probably isn't changing every day or even week, let alone every hour. TM can hard link /Applications and that one link essentially covers all of the files and folders within it. When pruning that backup it also just needs to delete one link instead of visiting every file and folder. Hand linking directories can be dangerous though (what if you make A/B/C -> A), so it's a feature that isn't exposed to user tools. >> Now I just rsync directly to the backup >> location (running on FreeNAS) and rely on ZFS snapshots to quickly >> make and prune old backups. > > Oh, cool. > > Should I look at MacZFS? If you're not working with a lot of data? Probably. ZFS is notorious for being RAM hungry. I think the recommendation is no fewer than 4 GB (not entirely unreasonable these days I guess), but you very quickly will want more. At a stretch you can probably get away with 1GB per TB, but I'm pretty sure that wouldn't be a great experience. If you have a spare drive to play with, why not? I think Zevo is the most current ZFS version, though the free version does have some potentially annoying restrictions (it's probably fine for new users and playing around). -- arno s hautala /-| [email protected] pgp b2c9d448 _______________________________________________ MacOSX-talk mailing list [email protected] http://www.omnigroup.com/mailman/listinfo/macosx-talk
