Anton, et al -- ...and then Anton Aylward said... % % David T-G said the following on 10/23/2013 06:59 AM: ... % >me undelete capability because operations happen on each dev separately, % >but it also ensures that I'll have a working disk % % If recovering changes - undelete - is the issue then why not use 'snapper'? % % http://doc.opensuse.org/products/draft/SLES/SLES-admin_sd_draft/cha.snapper.... Mainly because I hadn't heard of it :-) I've been a NetApp Filer user for years in my corporate life and have long wanted this. YIPPEE! I'll definitely be looking into this. % And not only with BtrFS... So, even though the doc says BtrFS only, XFS or ReiserFS will happily support snapper? Thanks again & HAND :-D -- David T-G See http://justpickone.org/davidtg/email/ See http://justpickone.org/davidtg/tofu.txt

Andrey Borzenkov said the following on 10/23/2013 12:50 PM:

В Wed, 23 Oct 2013 11:24:15 -0400 David T-G пишет:

...

% And not only with BtrFS...

So, even though the doc says BtrFS only, XFS or ReiserFS will happily support snapper?

No. There is experimental support for ext4 with LVM snapshots but it requires special LVM tools that are not available in standard distribution.

Curious. Since the LVM snapshot mechanism works underneath the file system by copying the partition/logical volume, that seems odd. Could you give more details please. If you mean 'snapper', then yes, perhaps, since snapper works at the FS level and requires a COW FS. -- "He is the Napoleon of crime, Watson. He is the organizer of half that is evil and of nearly all that is undetected in this great city. He is a genius, a philosopher, an abstract thinker. He has a brain of the first order. He sits motionless, like a spider in the center of its web, but that web has a thousand radiations, and he knows well every quiver of each of them. He does little himself. He only plans. But his agents are numerous and splendidly organized. If there a crime to be done, a paper to be abstracted, we will say, a house to be rifled, a man to be removed -- the word is passed to the Professor, the matter is organized and carried out. The agent may be caught. In that case money is found for his bail or his defence. But the central power which uses the agent is never caught -- never so much as suspected." -- Sherlock Holmes, in "The Final Problem" -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org To contact the owner, e-mail: opensuse+owner@opensuse.org

Andrey Borzenkov said the following on 10/23/2013 01:33 PM:

В Wed, 23 Oct 2013 13:26:03 -0400 Anton Aylward пишет:

...

...

If you mean 'snapper',

Yes, I do. The question was about what filesystems are supported by snapper.

Snapper works on COW file systems. Nothing to do with LVM. LVM has its own snapshot mechanism which works at the LV level regardless of the file system. COW - Copy On Write - is a feature used by SSD files systems and is available also on ZFS, BtrFS, ext3cow, http://faif.objectis.net/download-copy-on-write-based-file-systems ext3cow: https://www.usenix.org/legacy/events/fast04/wips/peterson.pdf http://www.ext3cow.com/ext3cow/Welcome.html ZFS: http://www.ext3cow.com/ext3cow/Welcome.html or in user-space http://user-mode-linux.sourceforge.net/old/UserModeLinux-HOWTO-7.html -- "The easiest thing to do in the world is to neglect the important and give in to the urgent." -- Denis Waitley -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org To contact the owner, e-mail: opensuse+owner@opensuse.org