[pve-devel] Sparse clone/move over a thin LVM ?

Alexandre DERUMIER aderumier at odiso.com
Thu Jul 28 06:52:39 CEST 2016

>>Why not fix qemu-img instead? 

This is strange, I am pretty sure that qemu-img was skipping zero writes

           "  '-S' indicates the consecutive number of bytes (defaults to 4k) that must\n"
           "       contain only zeros for qemu-img to create a sparse image during\n"
           "       conversion. If the number of bytes is 0, the source will not be scanned for\n"
           "       unallocated or zero sectors, and the destination image will always be\n"
           "       fully allocated\n"

it should be sparse by default, until we setup "-S 0"

----- Mail original -----
De: "dietmar" <dietmar at proxmox.com>
À: "Gilou" <contact+dev at gilouweb.com>, "pve-devel" <pve-devel at pve.proxmox.com>
Envoyé: Jeudi 28 Juillet 2016 06:20:50
Objet: Re: [pve-devel] Sparse clone/move over a thin LVM ?

> So I tried it by hand using dd conv=sparse, which works fine... 
> I'm no expert at this, but could it be that we could move/clone 
> sparse/thin disks this way if the destination is indeed a newly created 
> LV (case for move/clone) ? 

Why not fix qemu-img instead? 

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