[one-users] datablock - poor performance

[Andrei Vakhnin]

Hello,

I am wondering if qcow2 datablock gives a better performance over raw format. Do I have to use separate datastore to be able to use qcow2 images?  I am getting performance hit (only 12MB/s) when using 50GB non-persistent raw datablock formatted as ext3. Thanks

200000+0 records in
200000+0 records out
1638400000 bytes (1.6 GB) copied, 157.853 s, 10.4 MB/s

real    2m40.021s
user    0m0.042s
sys     0m3.839s

oneadmin at xxx:~> oneimage show 38
IMAGE 38 INFORMATION                                                            
ID             : 38                  
NAME           : data_loc            
USER           : oneadmin            
GROUP          : oneadmin            
DATASTORE      : default             
TYPE           : DATABLOCK           
REGISTER TIME  : 12/05 15:34:46      
PERSISTENT     : No                  
SOURCE         : /var/lib/one/datastores/1/bee8c51f03a40657a114ee3cf505d2a1
FSTYPE         : ext3                
SIZE           : 48.8G               
STATE          : used                
RUNNING_VMS    : 2                   

PERMISSIONS                                                                     
OWNER          : um-                 
GROUP          : ---                 
OTHER          : ---                 

IMAGE TEMPLATE                                                                  
DESCRIPTION="/data_loc"
DEV_PREFIX="sd"
DRIVER="raw"
TARGET="sdc"

Here is a template:

DISK=[
  BUS="virtio",
  DRIVER="raw",
  IMAGE_ID="52",
  READONLY="no",
  TARGET="sdb" ]yes

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