I have 3 domU running on a single server. 
  
Domain "clas-0" is exporting a directory to 
  domain "dbn-0" via NFS. 
Both "clas-0" and 
  "dbn-0" has time synchronisation from another external server. 
  
Both "clas-0" and "dbn-0" each has HDD file size 
  of 50G. 
I can ssh into both "clas-0' and 
  "dbn-0" normally ; login response is acceptable. 
Each domU has only a single virtual bridge. 
There is only one physical interface in the host machine, ie each domU 
  virtual interface is bridged into a single interface.
  "/var/log/xen/xend.log" file does not indicate any 
  errors. 
  At time of writing right now, "dbn-0" is creating 
  an Oracle database instance of 30G. 
  My problem is that the domain "dbn-0"  is 
  creating the oracle instance very slowly. 
I 
  do not know where the problem lies. 
Therefore I appreciate your advice on this, or any directions to 
  identify the bottlenecks. 
  Thanks. 
==============================================================================================================================
  xentop - 01:18:51   Xen 
  3.0.3-rc5-8.1.4.el 
4 domains: 1 running, 3 
  blocked, 0 paused, 0 crashed, 0 dying, 0 shutdown 
Mem: 8386520k total, 8385632k used, 888k free    CPUs: 8 
  @ 2000MHz 
      
  NAME  STATE   CPU(sec) CPU(%)     MEM(k) 
  MEM(%)  MAXMEM(k) MAXMEM(%) VCPUS NETS NETTX(k) NETRX(k) VBDS   
  VBD_OO   VBD_RD   VBD_WR SSID
       clas0 
  --b---       5633    
  3.0    1063196   12.7    
  1071516      12.8     
  1    1        
  0        0    
  2        
  0        
  0        0    0
  VCPUs(sec):   
  0:       5633s 
Net0 RX:        
  0bytes        
  0pkts        
  0err        0drop  
  TX:        
  0bytes        
  0pkts        
  0err        0drop 
VBD 5632 [16: 0]  
  OO:        0   
  RD:        0   
  WR:        0 
VBD  768 [ 3: 0]  
  OO:        0   
  RD:        0   
  WR:        0 
     clas1 
  --b---       9801    
  3.1    1063324   12.7    
  1071516      12.8     
  1    1        
  0        0    
  1        
  0        
  0        0    0
  VCPUs(sec):   
  0:       9801s 
Net0 RX:        
  0bytes        
  0pkts        
  0err        0drop  
  TX:        
  0bytes        
  0pkts        
  0err        0drop 
VBD  768 [ 3: 0]  
  OO:        0   
  RD:        0   
  WR:        0 
      dbn0 
  --b---       8130    
  3.1    1063196   12.7    
  1071516      12.8     
  1    1        
  0        0    
  1        
  0        
  0        0    0
  VCPUs(sec):   
  0:       8130s 
Net0 RX:        
  0bytes        
  0pkts        
  0err        0drop  
  TX:        
  0bytes        
  0pkts        
  0err        0drop 
VBD  768 [ 3: 0]  
  OO:        0   
  RD:        0   
  WR:        0 
  Domain-0 -----r       
  9525    0.9    5101568   
  60.8   no limit       
  n/a     8    4  1058702   
  766852    0        
  0        
  0        0    0
  VCPUs(sec):   
  0:       6011s  
  1:        288s  
  2:       1002s  
  3:        658s  
  4:        213s 
          
  5:        203s  
  6:        807s  
  7:        339s 
Net0 RX: 785256533bytes  
  1867080pkts        
  0err        0drop  TX: 
  1084111128bytes   
  521828pkts        
  0err        0drop
  Net1 RX:        
  0bytes        
  0pkts        
  0err        0drop  
  TX:        
  0bytes        
  0pkts        
  0err        0drop 
Net2 RX:        
  0bytes        
  0pkts        
  0err        0drop  
  TX:        
  0bytes        
  0pkts        
  0err        0drop 
Net3 RX:        
  0bytes        
  0pkts        
  0err        0drop  
  TX:        
  0bytes        
  0pkts        
  0err        0drop 
==============================================================================================================================
  ==============================================================================================================================
  [root@hostmachine ~]# xm vcpu-list 
Name                              
  ID VCPUs   CPU State   Time(s) CPU Affinity 
  
Domain-0                           
  0     0     0   
  -b-    6013.0 any cpu 
Domain-0                           
  0     1     3   
  -b-     288.6 any cpu 
Domain-0                           
  0     2     7   
  -b-    1002.7 any cpu 
Domain-0                           
  0     3     3   
  -b-     658.6 any cpu 
Domain-0                           
  0     4     4   
  -b-     213.9 any cpu 
Domain-0                           
  0     5     2   
  -b-     203.7 any cpu 
Domain-0                           
  0     6     1   
  -b-     808.0 any cpu 
Domain-0                           
  0     7     6   
  r--     339.5 any cpu 
clas0                             
  13     0     4   
  -b-    5640.1 any cpu 
clas1                              
  7     0     4   
  -b-    9807.0 any cpu 
dbn0                              
  10     0     5   
  -b-    8134.7 any cpu 
==============================================================================================================================