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Add Ext4 LVM snapshot support to Snapper.

Feature state

openSUSE Distribution
New

Description

Very simple. The way Snapper can work on Btrfs, enable it to work that way with the backup snapshots of Ext4 filesystems using Logical Volume Management.

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Discussion


icons/user_comment.png J. M. wrote: (6 years ago)

I haven't checked out 12.1 yet, but doesn't it work this way already? If not, it should. There was a Google Summer Of Code project to add ext4 support to snapper.
At http://en.opensuse.org/openSUSE:Upcoming_features#Snapper.2C_Btrfs_snapshot_support
we find "GSoC Projects... Add ext4 snapshots support to snapper "
I checked around online and although openSUSE never mentioned this project again in its newsletter, it seems the person doing it did get the code done based on his blog entries.

So the question I have is if snapper doesn't work with ext4 (and none of the promotional material mentions it does), what happened? It looks like everything should be done but it was only mentioned once like it "went black" and became a covert project or something. :-)

icons/user_comment.png A. S. wrote: (6 years ago)

The GCoS project was a failure. Nevertheless I have later added experimental ext4 support to snapper. But you need
a special kernel and tools for ext4 snapshot support. Thus we do not promote it like for btrfs.

If you are interested in ext4 snapshots look at the next4-devel project and help to get the support included in the
default kernel.

icons/user_comment.png A. S. wrote: (6 years ago)

We have to distinguish between LVM and ext4 support in snapper.

  • LVM support in snapper (making LVM snapshots) is currently no option. LVM
    snapshots do not dynamically share a storage pool and many snapshots ruin
    performance. With snapper you easily have 100 snapshots. This simply does not
    work together.

    There is active development to remedy those drawbacks of LVM snapshots.

  • Ext4 snapshots in snapper should work. One thing missing is proper mount/umount
    handling of the snapshots.

icons/user_comment.png A. S. wrote: (5 years ago)

LVM now provides thin-provisioning. Experimental support has been added to
snapper.

For support in SLES there exists Fate #313860.

Last change: 12 months ago
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