LVM - is thin provisioning used? - WAS Re: [gentoo-user] USE ruby_targets_ruby20

[Tanstaafl <tanstaafl@libertytrek.org>]

On 2013-11-15 5:18 PM, Alan McKinnon <alan.mckinnon@gmail.com> wrote:
> On 15/11/2013 23:58, Tanstaafl wrote:
>> Now, the question is, what the heck is thin-provisioning in lvm2, am I
>> using it, and if not, do I need it?
>>
>> I'm pretty sure I'm not using it, but how to be sure?

> If you use thin provisioning, you already know it. There are steps you
> must take to put it to use.

Ok, just to complete this thread (I didn't like this answer when it was 
presented - what if I inherited this system? Or, in this case, I 
installed it 8+ years ago, and don't remember for certain *what* I did, 
since it was my first time with any linux distro, much less gentoo?)...

So, a simple question on the lvm list reveals:

lvs -o segtype

will return 'thin' or 'thin-pool' for thin provisioned, or 'linear' (as 
mine did) for thick...