ve.proxmox.com
Envoyé: Vendredi 14 Septembre 2012 09:42:29
Objet: Re: [pve-devel] qcow2 bench and speed optimisations
xfs : ok
http://en.wikipedia.org/wiki/XFS#Sparse_files
ext4:ok
ext3:ok
ext2:ok
http://superuser.com/questions/218395/about-file-size-and-disk-usage-in-ext3
zfs: ok
DERUMIER"
Cc: pve-devel@pve.proxmox.com
Envoyé: Vendredi 14 Septembre 2012 09:17:09
Objet: RE: [pve-devel] qcow2 bench and speed optimisations
> so raw and qcow2 with metadatas alloc are sparse files, but you need a
> filesystem which support it.
Do you know a filesystem whi
> so raw and qcow2 with metadatas alloc are sparse files, but you need a
> filesystem which support it.
Do you know a filesystem which does not support sparse files?
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th lvm too :)
- Mail original -
De: "Dietmar Maurer"
À: "Alexandre DERUMIER"
Cc: pve-devel@pve.proxmox.com
Envoyé: Vendredi 14 Septembre 2012 07:58:42
Objet: RE: [pve-devel] qcow2 bench and speed optimisations
> >>If so, we can do that by default, becaus
xandre DERUMIER"
Cc: pve-devel@pve.proxmox.com
Envoyé: Vendredi 14 Septembre 2012 07:58:42
Objet: RE: [pve-devel] qcow2 bench and speed optimisations
> >>If so, we can do that by default, because metadata is small (128MB/TB).
> Note that the size file is the full size of the d
> >>If so, we can do that by default, because metadata is small (128MB/TB).
> Note that the size file is the full size of the disk (no sparse file).
That is bad.
What performance to you get when you pre-allocate the raw file?
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- Mail original -
De: "Dietmar Maurer"
À: "Alexandre DERUMIER" , pve-devel@pve.proxmox.com
Envoyé: Vendredi 14 Septembre 2012 07:10:42
Objet: RE: [pve-devel] qcow2 bench and speed optimisations
> 4)qemu-img create -f qcow2 -o
> size=100,prealloc
> 4)qemu-img create -f qcow2 -o
> size=100,preallocation=metadata,compat=1.1,lazy_refcounts=on
> file.img
> So I think it should be great to add an option for preallocatting metadatas,
> the boost is really huge.
Above command only pre-allocates metadata, so creation is still fast?
If so,
Hi,
I'm playing with qcow2 on my new netapp pnfs cluster,some optimisations can be
done.
some benchmarks :
1).raw file : 2io/s
2).qcow2 file, sparse : 300 io/s :/
3).qcow2, preallocated metadatas (nosparse): 4000io/s
4).qcow2, with lazy counts + preallocated metadatas : 4000io/s. (lazy
