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From: Gionatan Danti <g.danti@assyoma.it>
To: LVM general discussion and development <linux-lvm@redhat.com>
Cc: Eric Toombs <ewtoombs@uwaterloo.ca>
Subject: Re: [linux-lvm] faster snapshot creation?
Date: Tue, 25 Feb 2020 10:31:43 +0100	[thread overview]
Message-ID: <7c2966762598bf3ab8667bcd0b429464@assyoma.it> (raw)
In-Reply-To: <d5dd6c06-1e9f-3737-8712-137f92e351cb@uwaterloo.ca>

Il 2020-02-22 12:58 Eric Toombs ha scritto:
> So, is there a sort of "dumber" way of making these snapshots, maybe by
> changing the allocation algorithm or something?

Hi, I think that total snapshot creation time is dominated by LVM 
flushing its (meta)data to the physical disks. Two things to try:
- use thin lvm snapshot (see man lvmthin);
- create a pv/vg/lv from a memory-backed loop device (ie: truncate 
--size=1G /dev/shm/test.img; losetup -f /dev/shm/test.img; pvcreate 
/dev/loop0 and so on...)

-- 
Danti Gionatan
Supporto Tecnico
Assyoma S.r.l. - www.assyoma.it [1]
email: g.danti@assyoma.it - info@assyoma.it
GPG public key ID: FF5F32A8

  reply	other threads:[~2020-02-25  9:31 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-02-22 11:58 Eric Toombs
2020-02-25  9:31 ` Gionatan Danti [this message]
2020-02-25  9:38 ` Zdenek Kabelac
2020-02-25 21:35   ` Eric Toombs
2020-02-26 10:01     ` Zdenek Kabelac
2020-02-26 14:03       ` Douglas Paul
2020-02-26  0:38 ` Stuart D. Gathman

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