From: Zdenek Kabelac <zkabelac@redhat.com>
To: Raymond Jennings <shentino@gmail.com>
Cc: LVM general discussion and development <linux-lvm@redhat.com>
Subject: Re: [linux-lvm] thin discards
Date: Sun, 21 Jul 2013 21:40:38 +0200 [thread overview]
Message-ID: <51EC3936.2020607@redhat.com> (raw)
In-Reply-To: <CAGDaZ_p9V8VySv_VKxuJLhnjDhZoJNtD60qDo67XTvqthkxoXA@mail.gmail.com>
Dne 21.7.2013 13:01, Raymond Jennings napsal(a):
> Do snapshots behave the same way as thin volumes wrt discards?
>
>
> On Sun, Jul 21, 2013 at 3:47 AM, Zdenek Kabelac <zkabelac@redhat.com
> <mailto:zkabelac@redhat.com>> wrote:
>
> Dne 21.7.2013 09:10, Raymond Jennings napsal(a):
>
> So can thin volumes support discards independently of the device
> underneath them?
>
> I expected fstrim to free space in the thin pool.
>
>
> Yes - you are expecting it correctly.
>
> Ignore is mostly usable in case you do not want to free already
> provisioned space - which might be in certain cases better for performance.
>
> But you need to use recent enough kernels and lvm2 tools - since discards
> support required kernel updates.
>
>
> Kernel: 3.10.1-gento
> LVM2: 2.02.97
>
> Are these versions recent enough?
Nope - 2.02.98 has fixes for discards - it's been just introduced in 2.02.97
and had some problems - possible those you can observe.
Zdenek
next prev parent reply other threads:[~2013-07-21 19:40 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-07-15 15:32 [linux-lvm] thin discards Raymond Jennings
2013-07-16 10:16 ` Zdenek Kabelac
2013-07-16 11:33 ` Raymond Jennings
2013-07-21 7:10 ` Raymond Jennings
2013-07-21 10:47 ` Zdenek Kabelac
2013-07-21 11:01 ` Raymond Jennings
2013-07-21 19:40 ` Zdenek Kabelac [this message]
2013-07-22 9:47 ` Zdenek Kabelac
2013-07-22 10:12 ` Raymond Jennings
2013-07-22 10:16 ` Zdenek Kabelac
2013-07-24 3:12 ` Raymond Jennings
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