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SubjectRe: LVM snapshot broke between 4.14 and 4.16
On Sat, Aug 04 2018 at 12:22pm -0400,
Theodore Y. Ts'o <tytso@mit.edu> wrote:

> On Sat, Aug 04, 2018 at 10:36:50AM +0200, Zdenek Kabelac wrote:
> > dm-snapshost has really outdated design - it's been useful in the old age
> > where megabyte was hell lot of space.
> >
> > Nowadays, when users do need to handle snapshots in multi gigabyte sizes and
> > moreover have number of snapshots from the same volume taken over the time,
> > want to take snapshot of snapshot of snapshot, the old snapshot simple kills
> > all the performance, uses tons of resources and becomes serious bottleneck
> > of your system and has lots of usability limitation.
>
> Fair enough. I don't think I would consider that makes dm-snapshot a
> "steaming pile". For me, protection against data loss is Job One.

What's your point Ted? Do you have _any_ intention of actually using
anything DM or is this just a way for you to continue to snipe at it?

> > That's where thin provisioning will shine....
>
> The dm-thin development might want to take a look at what's currently
> in Documentation/device-mapper/thin-privisioning.txt:
>
> Status
> ======
>
> These targets are very much still in the EXPERIMENTAL state. Please
> do not yet rely on them in production. But do experiment and offer us
> feedback. Different use cases will have different performance
> characteristics, for example due to fragmentation of the data volume.
>
> If you find this software is not performing as expected please mail
> dm-devel@redhat.com with details and we'll try our best to improve
> things for you.
>
> Userspace tools for checking and repairing the metadata are under
> development.
>
> Saying that dm-snapshot is a steaming pile and dm-thin is what
> everyone should use doesn't seem to be consistent with the above.

Maybe read your email from earlier today before repeating yourself:
https://lkml.org/lkml/2018/8/4/366

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