I'm not aware of any change in TSM architecture which allows querying
actual client file sizes as stored in TSM server storage, from the
server. The actual sizes can be obtained via 'dsmc Query Backup'
client queries (which a server administrator may be able to perform
via Virtualnodename, if the client password is known, and a like
client platform is available). Another, ungainly, approach is to scan
the client backup logs for sizes.

File size is one of the file system attributes which is accessible to
the TSM client because it is programmed to understand the nuances of
the various file systems it handles.  To appreciate the difficulty of
having the server understand client file system particulars, consider
the problems of a non-Unicode server trying to understand and report
even the file system name of a Unicode client.

   Richard Sims