[PVE-User] Strange behaviour of the disk access : Guest faster than host

Daejuan Jacobs daejuan at gmail.com
Tue May 13 00:39:08 CEST 2014


What do you get when you run ?

hdparm -Tt /dev/sda



On Mon, May 12, 2014 at 3:18 PM, Philippe Schwarz <phil at schwarz-fr.net>wrote:

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> Hi,
> on Proxmox 3.1 with LInux KVM guest :
>
> # hdparm -t /dev/vda
>
> /dev/vda:
>  Timing buffered disk reads: 896 MB in  3.02 seconds = 296.78 MB/sec
>
> On the prxomox host itself:
>
>  hdparm -t /dev/sda
>
> /dev/sda:
>  Timing buffered disk reads: 388 MB in  3.01 seconds = 129.09 MB/sec
>
>
> So, ....the VM is more than twice faster than the real disk
> subsystem... Weird....
>
> Did i hit a cache problem ?
>
> Thanks
>
> Best regards
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