[one-users] Strange behaviour of DEFAULT_DEVICE_PREFIX and TARGET when using Xen in HVM mode

[Maxence Dunnewind]

Hi Tino,

> Not sure why that is the case. To use /dev/xvd* devices in Xen, domU's
> need to load the xen paravirtualization kernel modules.
> 
> Maybe loading these drivers as explained in [1] helps?

I tried loading these modules without result, the datablock still does not
appear. 

Anyway, if I change the deployment.0 to replace xvde by xvdc, so it looks like : 

===
name = 'one-1956-2'
#O CPU_CREDITS = 256
memory  = '256'
kernel = '/usr/lib/xen-default/boot/hvmloader'
disk = [
    'tap:aio:/srv/cloud/one/var/1956/images/disk.0,xvda,w',
    'tap:aio:/srv/cloud/one/var/1956/images/disk.1,xvdc,w',
    'tap:aio:/srv/cloud/one/var/1956/images/disk.2,xvdb,r',
    ]
vif = [
    ' mac=02:00:83:fe:cc:a3,ip=131.254.204.163,bridge=eth0',
]
builder='hvm'
device_model='/usr/lib/xen-default/bin/qemu-dm'
vfb = [ 'type=vnc' ]
====

Then it works, the disk is correctly detected ( as /dev/sdc ).

I tried many values, works for xvdc & xvdd, does not work for xvde and above
(always shown as sdc).

Maxence
-- 
Maxence Dunnewind
System Engineer on Bonfire
Research Center INRIA Rennes - Bretagne Atlantique, France
Team Myriads, Office E219, tel +33 2 99 84 25 76
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