You can try to mount the filesystem with allocsize=64K as suggested here:
http://forum.proxmox.com/archive/index.php/t-17462.html

I had problems with xfs also, and befeore I saw these thread, I re-formated the FS to ext4, and it worked...

On Thu May 15 12:00:29 2014, Gilberto Nunes wrote:
Yes... I am using XFS. But I always do!
Why should this trouble appears just know!!
And worst: why it is works fine with the Pve kernel?? When boot using
the Pve kernel, I do not change the filesystem either...

Btw, thanks for answer...

Em 15/05/2014 03:58, "Angel Docampo" <[email protected]
<mailto:[email protected]>> escreveu:

    What filesystem do you have in the slow system? XFS perhaps? I
    think there is a bug on XFS with preallocation.





    Enviado desde mi móvil LG

    ------ Mensaje original ------
    De: Gilberto Nunes
    Fecha: 15/05/2014 3:24
    Para: [email protected] <mailto:[email protected]>;
    Asunto:[PVE-User] Debian 7.5 and Proxmox...

    Hello guys

    I remember that I already installed Proxmox over Debian 7.4
    sometimes ago and everything running smootlhy even when I used
    default Debian Kernel - i.e. 3.2.x something...

    Now I backup to install Proxmox 2.6.32 and I notice that when I
    use kernel 3.2.0-4-amd64, the creation of hard disk took a lot of
    time!!! Sometimes, it took 5 or 8 minutes, to create a virtio disk
    with 8G size...

    But when I reboot my host, a simple laptop, with Intel Core i5, 4
    gb of memory, when I reboot and start the laptop with Proxmox
    kernel, i.e. 2.6.32-29-pve, everything running smootlhy...

    ii  pve-qemu-kvm                          1.7-8
               amd64        Full virtualization on x86 hardware
    ii  qemu-server                           3.1-16
              amd64        Qemu Server Tools

    So I image that qemu-img create perform a full space allocation
    into file image...

    But I wonder why with Debian default kernel took a lot of time and
    with pve kernel everything works well!

    Some explanation??

    Thanks a lot...

    A note: Right now I'm running pve kernel while I write this
    mail... And everything works well, but qemu-img create still
    perform a fully space allocation into file image... I don't know
    if this is a default behavior or not!




    --
    Gilberto Ferreira


--

        
*Angel Docampo
*
*Datalab Tecnologia, s.a.*
Castillejos, 352 - 08025 Barcelona
Tel. 93 476 69 14 - Ext: 706
Mob. 670.299.381


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