Via TSM Support Page 
http://www.ibm.com/support/entry/portal/Overview/Software/Tivoli/Tivoli_Storage_Manager
 you can access all the info you need to research client choices and other TSM 
elements.
See IBM Technote 1243309 for a listing of supported OS versions.

On Jan 31, 2011, at 4:52 PM, msblack wrote:

> I have a very large file system with more than 20 million files. I want to 
> keep the entire file tree in RAM on a 32-gigabyte system. Is there a 64-bit 
> version of the dsmc backup client or something that can exceed 4 gigabytes?
> 
> +----------------------------------------------------------------------
> |This was sent by black AT csulb DOT edu via Backup Central.
> |Forward SPAM to abuse AT backupcentral DOT com.
> +----------------------------------------------------------------------