[linux-lvm] Fast thin volume preallocation?

[Joe Thornber]

On Fri, May 31, 2019 at 03:13:41PM +0200, Gionatan Danti wrote:

> - does standard lvmthin support something similar? If not, how do you see a
> zero coalesce/compression/trim/whatever feature?

There isn't such a feature as yet.  With the next iteration of thin I'd like to
get away from the fixed allocation block sizes that we're using which should greatly
reduce the number of mappings that we need to create to provision a thick volume and
so speed it up a lot.

Presumably you want a thick volume but inside a thin pool so that you can used snapshots?
If so have you considered the 'external snapshot' feature?

> - can I obtain something similar by simply touching (maybe with a 512B only
> write) once each thin chunk?

Yes.

- Joe