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

Peter Sarossy peter.sarossy at gmail.com
Tue May 13 17:45:56 CEST 2014


HDParm is not meant as a benchmark tool, and i would generally ignore it's
results past the "it looks slow" or "it looks fast" type. Try bonnie++.
On May 13, 2014 1:39 AM, "Daejuan Jacobs" <daejuan at gmail.com> wrote:

> 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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