unable delete flat.vmdk file

Hi,

I've met the situation of delte flat.vmdk file in vmware 5.0, talk a little bit about my configuration:

- ESX 5.0,

- VCenter 5.0,

- 7 ESX host, and over 100 VMs at working status,

- FC - SAN

So, i can not do some thing on my system with downtime.

When i destroy the VM, some files of that VM was deleted except <vm-name>-flat.vmdk, i can not delete that file with the error "Can not delete file [datastore] <dir>/<vm-name>-flat.vmdk".

Then i tried connect directly to ESX host via SSH to delete that file, an error appears when try #rm <vm-name>-flat.vmdk with error "rm: cannot remove '<vm-name>-flat.vmdk': Resource temporarily unavailable"

And i would try some thread from other same situation , some like:

It's not work for me. So, i tried move (login to ESX, run mv <file name>-flat.vmdk <another datastore dir>) that file from this datastore to another and delete the file after move, it work for some files, but somes file can not do by that way.

Can u help me ?