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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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  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 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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