[linux-lvm] Does LVM always do 'dm suspend' when lvcreating a thin snapshot?

Mike McCracken mike.mccracken at canonical.com
Fri Sep 4 16:52:37 UTC 2015

OK, thanks for confirming!
I'd like to help improve the documentation about this - did I miss a place
where it was mentioned explicitly? If not, where would a discussion of FS
suspending fit? I'm happy to contribute a patch.

On Fri, Sep 4, 2015 at 4:05 AM, Zdenek Kabelac <zkabelac at redhat.com> wrote:

> Dne 4.9.2015 v 00:04 Mike McCracken napsal(a):
>> When creating a thin snapshot of a thin volume, does LVM always freeze
>> the FS?
>> I see when I run lvcreate with -vvv that it sends the 'dm suspend'
>> message to
>> the origin lv, but on looking at the code I wasn't quite able to convince
>> myself that it will always do that, or under what circumstances it won't.
> Hi
> Yes - suspend of thin's snapshot origin is always enforced
> as you normally want snapshot FS to be in consistent state.
> Zdenek
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