[linux-lvm] thin pool and discards

[Mike Snitzer]

On Tue, Sep 30 2014 at 10:57am -0400,
Vasiliy Tolstov <v.tolstov at selfip.ru> wrote:

> 2014-09-30 18:35 GMT+04:00 Zdenek Kabelac <zkabelac at redhat.com>:
> > Kernel 3.10 is too old,
> > Please repeat the test with at least 3.16
> 
> 
> Why? As i understand 3.10 lts... Can you say me what patches i need to
> cherry pick? Or maybe redhat kernel have this feature...?

You likely need this upstream commit:
http://git.kernel.org/linus/19fa1a6756ed9e92daa9537c03b47d6b55cc2316

Though that commit was tagged for stable.  So not sure.

In general, upstream dm-thinp saw quite a few improvements that in
combination results in a much more stable dm-thinp (particularly error
handling from faults and out of space conditions).

RHEL7 does include these changes.