>No tools, ZFS does it automaticaly when freeing blocks when the 
>underlying device advertises the functionality.
>ZFS ZVOLs shared over COMSTAR advertise SCSI UNMAP as well.

If a system was running something older, e.g., Solaris 11; the "free" 
blocks will not be marked such on the server even after the system 
upgrades to Solaris 11.1.

There might be a way to force that by disabling compression and then 
create a large file full with NULs and then remove that.  But you need to 
check first that this has some effect before you even try.


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