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Date: Mon, 22 Jul 2013 12:16:24 +0200
From: Zdenek Kabelac <zkabelac@redhat.com>
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Subject: Re: [linux-lvm] thin discards
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To: Raymond Jennings <shentino@gmail.com>
Cc: LVM general discussion and development <linux-lvm@redhat.com>

Dne 22.7.2013 12:12, Raymond Jennings napsal(a):
> I tried to run a fstrim on a mounted snapshot (regular snapshot, not thin
> snapshot) and got zip.
>

I've been talking about  thin snapshots.

Of course - for old non-thin snapshot - TRIM is not supported.
(And it doesn't look like anything simple to implement)

Zdenek


>
>
> On Mon, Jul 22, 2013 at 2:47 AM, Zdenek Kabelac <zkabelac@redhat.com
> <mailto:zkabelac@redhat.com>> wrote:
>
>     Dne 21.7.2013 21:40, Zdenek Kabelac napsal(a):
>
>         Dne 21.7.2013 13:01, Raymond Jennings napsal(a):
>
>             Do snapshots behave the same way as thin volumes wrt discards?
>
>
>     Yes, snapshots are just like any other thin volumes.
>
>     Just a side note - until I think 3.9 kernel there used to be
>     bug, which had wrong ref-counting of shared blocks.
>
>     Zdenek
>
>