file size for tar: what's the limit and workaround?

Hello managers!
 
In trying to copy files from one machine to another using tar (both
machines run Tru64 5.1A PK6):
 
	tar -cf - . | rsh remote_server 'cd /disk/path/subdir/ && tar
-xvBsf -'

I got the following error:

	tar: ./hot_back_d3/psindex.dbf : File too large for archive
format, truncating to 8589934591 bytes

I read the man page and searched the web and can't find any reference to
what the largest size is for a file to be included in a tar.

Does anybody have a workaround?  How about gtar -- has anybody used that
with large files?  Any other ideas?

Thank you!
Andy