From mboxrd@z Thu Jan  1 00:00:00 1970
Date: Wed, 7 Nov 2012 17:24:30 -0500
From: Mike Snitzer <snitzer@redhat.com>
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Subject: Re: [linux-lvm] strange usage stats for thin LV
Reply-To: LVM general discussion and development <linux-lvm@redhat.com>
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To: Andres Toomsalu <andres@active.ee>
Cc: LVM general discussion and development <linux-lvm@redhat.com>

On Wed, Nov 07 2012 at  5:03pm -0500,
Andres Toomsalu <andres@active.ee> wrote:

> Apparently that does not work - FITRIM ioctl not backported to RHEL6 kernel perhaps?
> 
> fstrim -v /backup
> fstrim: /backup: FITRIM ioctl failed: Operation not supported
> 
> df -h
> /dev/mapper/VolGroupL0-thin_backup 591G  104G  458G  19% /backup
> 
> mount (added discard option today)
> /dev/mapper/VolGroupL0-thin_backup on /backup type ext4 (rw,discard)

ext4's FITRIM support was updated in RHEL6.3.  Which version of RHEL6
are you running?