>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. Casper _______________________________________________ zfs-discuss mailing list firstname.lastname@example.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss