From: Demi Marie Obenour <demi@invisiblethingslab.com>
To: Gionatan Danti <g.danti@assyoma.it>
Cc: LVM general discussion and development <linux-lvm@redhat.com>
Subject: Re: [linux-lvm] Running thin_trim before activating a thin pool
Date: Mon, 31 Jan 2022 10:28:57 -0500 [thread overview]
Message-ID: <YfgAOeqHtutU91rI@itl-email> (raw)
In-Reply-To: <9c35198501aae82e7a911f5418cfd7f6@assyoma.it>
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On Mon, Jan 31, 2022 at 12:02:23PM +0100, Gionatan Danti wrote:
> Il 2022-01-29 18:45 Demi Marie Obenour ha scritto:
> > Is it possible to configure LVM2 so that it runs thin_trim before it
> > activates a thin pool? Qubes OS currently runs blkdiscard on every thin
> > volume before deleting it, which is slow and unreliable. Would running
> > thin_trim during system startup provide a better alternative?
>
> I think that, if anything, it would be worse: a long discard during boot can
> be problematic, even leading to timeout on starting other services.
> After all, blkdiscard should be faster then something done at higher level.
thin_trim is a userspace tool that works on an entire thin pool, and I
suspect it may be significantly faster than blkdiscard of an individual
thin volume. That said, what I would *really* like is something
equivalent to fstrim for thin volumes: a tool that works asynchronously,
in the background, without disrupting concurrent I/O.
> --
> Danti Gionatan
> Supporto Tecnico
> Assyoma S.r.l. - www.assyoma.it
> email: g.danti@assyoma.it - info@assyoma.it
> GPG public key ID: FF5F32A8
FYI, you might want to specify a full fingerprint here; short key IDs
are highly vulnerable to collision and preimage attacks.
--
Sincerely,
Demi Marie Obenour (she/her/hers)
Invisible Things Lab
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next prev parent reply other threads:[~2022-01-31 15:29 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-01-29 17:45 [linux-lvm] Running thin_trim before activating a thin pool Demi Marie Obenour
2022-01-31 11:02 ` Gionatan Danti
2022-01-31 13:41 ` Zdenek Kabelac
2022-01-31 14:12 ` Gionatan Danti
2022-01-31 15:28 ` Demi Marie Obenour [this message]
2022-01-31 17:54 ` Gionatan Danti
2022-01-31 19:04 ` Demi Marie Obenour
2022-01-29 18:52 Demi Marie Obenour
2022-01-29 19:42 ` Zdenek Kabelac
2022-01-29 20:09 ` Demi Marie Obenour
2022-01-29 21:40 ` Zdenek Kabelac
2022-01-30 1:20 ` Demi Marie Obenour
2022-01-30 11:18 ` Zdenek Kabelac
2022-01-30 17:30 ` Demi Marie Obenour
2022-01-30 17:56 ` Zdenek Kabelac
2022-01-30 18:01 ` Demi Marie Obenour
2022-01-30 18:42 ` Zdenek Kabelac
2022-01-30 20:22 ` Gionatan Danti
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