From: Kumar amit mehta <gmate.amit@gmail.com>
To: Zdenek Kabelac <zkabelac@redhat.com>
Cc: linux-lvm@redhat.com
Subject: Re: [linux-lvm] lvcreate --thin gives "unknown segment type" error
Date: Mon, 22 Jul 2013 20:52:37 -0400 [thread overview]
Message-ID: <20130723005237.GA4977@gmail.com> (raw)
In-Reply-To: <51ED93A8.6040303@redhat.com>
On Mon, Jul 22, 2013 at 10:18:48PM +0200, Zdenek Kabelac wrote:
> It's your backend device used for thinpool data which doesn't
> support discard. So it fallbacks to nopassdown behaviour (discard
> is processed only at pool level).
So, it seems that my backend device(of which I've no idea!!) does not
support discard.
>
> >I'm invoking these commands on a VM. I do not know, from where these
> >storage were mapped to my VM(were done my some storage admin). However
>
> Important piece of puzzle - if you want to see TRIM command hits your storage,
> your storage needs to support it ;)
>
> BTW it's perfectly ok to use thin pool only with nopassdown.
>
> Zdenek
>
>
> NOTE: issue_discard in lvm.conf is not related in any way with
> --discards option for thin pool creation.
Hmm.
Thank you for your time and answering my queries.
!!amit
prev parent reply other threads:[~2013-07-23 0:52 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-07-22 5:15 [linux-lvm] lvcreate --thin gives "unknown segment type" error Kumar amit mehta
2013-07-22 12:15 ` Zdenek Kabelac
2013-07-22 10:57 ` Kumar amit mehta
2013-07-22 11:23 ` Kumar amit mehta
2013-07-22 20:18 ` Zdenek Kabelac
2013-07-23 0:52 ` Kumar amit mehta [this message]
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