On Thu, Oct 23, 2014 at 11:05 PM, Steven Haigh <[log in to unmask]> wrote:
> On 24/10/2014 1:59 PM, Orion Poplawski wrote:
>>
>> What do you have against partitioning the disk?  Loosing the 512-bytes
>> for the partition table?
>
> On some setups it can cause major write degradations in the virtual machine.
>
> If you can imaging the disk being set up in 4Kb clusters - which LVM
> then adheres to - but on the DomU disk with a partition, the alignment
> for partition data is now 0 + 512 bytes instead of 0.
>
> This means a write of 4Kb would write two sectors to the physical disk
> (first being 512 bytes + 4Kb, the second being the 512 bytes that give
> us an offset).

Modern fdisk starts partitions at 2048 and not 512.