[Xen-API] xapi VDI.getPhysicalUtilisation not equals .vhd file size on disk in NFS

[ND KK <k110168@xxxxxxxxx>]

Hello all,

I have a problem,

We use XCP 1.1 and add a NFS volume on it. This NFS volume from a NFS Server which install on CentOS 5.6.

When we provided many VMs in this SR, we find that the sum of  all VDIs Physical Utilisation (get from xapi) in this SR greater than the SR's Physical Utilisation .

Then, I ssh to the NFS server check the VHD files size

I use command: ls -lh  VHD_FILE_NAME

It show that 

-rw-r--r-- 1 root root  4.9G  Aug  8 02:38 e77405a8-cb42-449c-b20e-912fe2a46ac2.vhd

use command: du -sh VHD_FILE_NAME

It show that 

3.0G  e77405a8-cb42-449c-b20e-912fe2a46ac2.vhd

Why they are different?

The sum of all VDIs physical utilisation get from Xapi "VDI.getPhysicalUtilisation" is like the sum of  ls -lh VHD_FILE_NAME

The SR's physical utilisation get from Xapi "SR.getPhysicalUtilisation" is like the sum of  du -sh VHD_FILE_NAME

Is it a XAPI's BUG?

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