First, I create a new HVM via virtual manager or using
“xm new” according to a config file.
Second, I log in this VM, and do something like
calculating MD5 or using dd to create a file.
 
Thied, I use xm top to see the I/O information of this
guest, and it always show 0 as below
VBD BlkBack  768 [ 3: 0] 
OO:        0  
RD:        0  
WR:        0  
RSECT:          0  
WSECT:       0
I also tried to use ping in VM(EX : ping www.google.com ), and use xm network-list to
monitor it.
The result is shown as below, and the information is
not correct, either.
[root@localhost ~]# xm network-list vm1
Idx BE     MAC Addr.     handle state
evt-ch tx-/rx-ring-ref
BE-path
0   0  00:16:36:63:d4:d3   
0     1      -1   
-1   /-1      /local/domain/0/bac
 
Any config I forget to setup?