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From: Peter Rajnoha <prajnoha@redhat.com>
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Date: Wed, 12 Aug 2015 09:57:23 +0200
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Subject: Re: [linux-lvm] lvremove does not pass discards if volume is part
 of thin pool
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To: vaLentin chernoZemski <valentin@siteground.com>
Cc: LVM general discussion and development <linux-lvm@redhat.com>

On 08/12/2015 09:46 AM, Peter Rajnoha wrote:
> On 08/11/2015 04:35 PM, Mike Snitzer wrote:
>> I'll have to defer to the lvm2 developers, I thought we added explicit
>> logging when lvm2 issues discards (as part of lvremove, etc) -- Peter,
>> and/or Alasdair?
>>
> 
> Yes, we log that like (visible in the verbose -vvv output):
> 
>   "Discarding X extents offset Y sectors on /dev/Z."
> 
> Also, when removing a volume, we issue this message:
> 
> # lvremove vg1/lvol0
> Do you really want to remove and DISCARD logical volume lvol0? [y/n]: 
> 
> For this, the "devices/issue_discards=1" must be set - it's not
> by default.
> 

Well, sorry, this applies for usual PVs, not thin pools (I overlooked
the $subject and just saw the last question...)

-- 
Peter