From: Gionatan Danti <g.danti@assyoma.it>
To: Zdenek Kabelac <zkabelac@redhat.com>
Cc: LVM general discussion and development <linux-lvm@redhat.com>
Subject: Re: [linux-lvm] Time needed for take a snapshot
Date: Mon, 20 Jan 2020 16:54:27 +0100 [thread overview]
Message-ID: <57f24a244dc2fc665f77f8ba9f3cea1e@assyoma.it> (raw)
In-Reply-To: <0d0d022b-93ea-156d-c408-49efbc31bbb2@redhat.com>
Il 20-01-2020 15:40 Zdenek Kabelac ha scritto:
> Yep - kernel metadata 'per thin LV' are reasonably small - so even for
> big thin devices it still should fit within your time boundaries.
> (effectively thin snapshot just increases 'mapping' sharing between
> origin and its snapshot - so the time needed depends on how many bTree
> nodes needs to be updated - so if you would manage to create heavily
> fragmented multi TiB thinLV, the time depends on speed of you metadata
> device - as long as device is fast (i.e. >= SSD) - operation should be
> quick.
> But ATM there is no scientific proof for the worst case scenario.
Well, I'll do some tests and update here if finding anything
interesting.
Thanks.
--
Danti Gionatan
Supporto Tecnico
Assyoma S.r.l. - www.assyoma.it
email: g.danti@assyoma.it - info@assyoma.it
GPG public key ID: FF5F32A8
prev parent reply other threads:[~2020-01-20 15:54 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-01-19 12:59 [linux-lvm] Time needed for take a snapshot Gionatan Danti
2020-01-20 9:22 ` Zdenek Kabelac
2020-01-20 10:36 ` Gionatan Danti
2020-01-20 14:40 ` Zdenek Kabelac
2020-01-20 15:54 ` Gionatan Danti [this message]
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