[Xen-API] some confusion about SR and PBD and ...

["moss.mose@xxxxxxxxx" <moss.mose@xxxxxxxxx>]

Hi to everyone !
I'm new here, so this is my first post.

I'm playing around with Xen Server on an Ubuntu server installation using LVM 
as its main disk management framework. Well it's an installation option to do 
so ... (maybe that wasn't a good idea to choose in the first place...)
Now...
Of course I came to the point where I needed an SR. Following some tutorials I 
created a new partition, in my case an LV, and an SR on top of it.
When I checked the LVM settings I saw that a new PV, VG and LV have been 
created.
So I thought "WOW" ... next I did was checking the data rate, so I wrote a file 
with 4G in size (with dd) to the disk. One to the disk created for the SR and 
one to a disk one "abstraction layer" lower (or obove ? ... whatever ... :) ).
The difference was quite noticable ~175MB/s on the SR disk and ~211MB/s one 
layer lower...
Hm... I did some searching, but this seems to be the normal way...

So my question: Is it somehow possible to attach an LV to be used (and managed) 
by XEN as a SR more directly (instead of having it create this whole bunch of 
virtulization-thingies...)

Because I didn't find anything in the web this might be a stupid question but I 
thought ... well ... ask anyway :)

Greetings, 
Oliver
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