Anytime the data gets written again, it will be collocated.  
So if your tape pool turns over fairly often due to reclaims, you could
just leave it alone for a while and let the reclaims do the work!
 

> ----------
> From:         sbm[SMTP:sbm AT huron DOT net]
> Sent:         Saturday, February 07, 1998 12:52 AM
> To:   ADSM-L AT vm.marist DOT edu
> Subject:      Collocation question...
> 
> I have enabled collocation on our tape pool in ADSM and things seem to
> be going well.  Here's the question - can I force ADSM to collocate
> data which has already been backed up?  Or, is this simply a setting
> which applies to future backups?  If I can force a collocation please
> let me know how.  Thanks.
>  
> Steven
>