[Xen-API] A question of Virtual Disk(VHD) size in thin provisioning NFS SR

[ND KK <k110168@xxxxxxxxx>]

Hello all, 

I have a question. But my English is very poor, I hope you will understand

My VM has one virtual disk which allocated 100G 

I find the utilization of this disk in guest OS is 39.5G ( Get utilization on guest OS file system)

but  I ssh to the NFS server check the VHD files size

I use command: ls -lh  VHD_FILE_NAME ( Get utilization on NFS server file system)

It show that 

-rw-r--r-- 1 root root 19G Jan 22  2013 XXXXXXX.vhd

Then, I use command: du -sh VHD_FILE_NAME ( Get physical utilization on disk )

It show that 

5.5G  XXXXXXXX.vhd

My question is what happen in this process ( 100G -> 39.5G -> 19G -> 5.5G )? 

Are they representing  XenServer's thin provision, VHD's thin provision and File System sparse file ?

Does XenServer's thin provision equals VHD's thin provision? VHD's thin provision equals File System sparse file ?

If yes,  what happen in this process?

Thanks

-

Best Regards,

Leo Hsu

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