[kwlug-disc] Sharing ZFS joy

[Mikalai Birukou]

Yep. This is even easier. Wonderful!

`/<storage>/.zfs` isn't visible in `ls /<storage>/` but all other 
operations work with it. If I am asked to reproduce this with FUSE 
layer, directory listing operation(s) produce content, which doesn't 
have `.zfs`, but when someone has path starting with root `.zfs` things 
are resolved instead of returning not-found.


So, for an additional backup off the system, like rsync/tar-ing files 
(unlike sending zfs snapshot), tool may start working on snapshot that 
ensures atomic view on data tree. This is a second cool!

> It might be even easier than that.
>
> I think the default is that snapshots are visible in .zfs/snapshot
> in the root of the filesystem.  So, if you have a zfs filesystem
>      mypool/home
> mounted on /home (or /mypool/home), then you may be able to browse
> snapshots in
>      /home/.zfs/snapshot
> without doing a clone.
>
> Normally the .zfs directory doesn't show up in ls (or ls -a)
> so you have to know to look for it.
>
> Or at least that's my experience.
>
> Cheers
>
> John
>
>
> On Tue, 2021/12/28 11:39:25PM -0500, Mikalai Birukou via kwlug-disc <kwlug-disc at kwlug.org> wrote:
> | 1) `zfs clone -o mountpoint=<mount_of_that> <snapshot> <view-fs>` Clones and
> | mounts snapshot-ed data, making it accessible. This operation is fast as is
> | it doesn't any byte move/unzip-ing.
> |
> | 2) Do corrective operations.
> |
> | 3) Unmount and destroy <view-fs>.