Unable to free up space on a data store

I recently ran into an issue within ESX 2.5, where I’m unable to free up space on a data store.  This issue came when I accidentally cold-migrated a Cluster node which moved all the vmdk(s) to a new data store location including the cluster vmdk that were on separate data stores.  So to resolve this issue I’m trying to move the cluster vmdk(s) back to their original location but the Unable to free up space on a data storevdf[/b] command is showing that I do not have sufficient space available, and when I Unable to free up space on a data storels[/b] the directory nothings there.  See below

\[root@esx11 vmfs]# vdf -h vmhba0:0:23:10

Filesystem            Size    Used   Avail   Use% Mounted on

Unable to free up space on a data storevmhba0:0:23:10  517M  407M  110M  78%    /vmfs/vmhba0:0:23:10[/b]

\[root@esx11 vmfs]# ls -ltr /vmfs/vmhba0:0:23:10

Unable to free up space on a data storetotal 0[/b]

Has anyone seen this issue before and/or know of a way to resolve it?

Regards,