Success to add Volume service and attach volume into instance

Attach device must be after /dev/vda 

for example
#euca-attach-volume -i  <instance> -d /dev/vd[b,c,d,e] <volume_ID>



#euca-describe-volume

VOLUME  vol-00000003     5              nova    in-use (hugopro, ubuntu2, i-00000017[ubuntu3], \/dev\/vdb)      2011-04-14T09:07:02Z

instance#fdisk-l

Disk /dev/vda: 1476 MB, 1476395008 bytes
16 heads, 63 sectors/track, 2860 cylinders
Units = cylinders of 1008 * 512 = 516096 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000

Disk /dev/vda doesn't contain a valid partition table

Disk /dev/vdb: 5368 MB, 5368709120 bytes
16 heads, 63 sectors/track, 10402 cylinders
Units = cylinders of 1008 * 512 = 516096 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000