initial recursive rpool snapshot fails on swap (out of space)

Hi,

Ive been trying to create a recursive ZFS snapshot archive of a root pool on Solaris 11.1

The idea was to first make the rpool snapshot recursively, then remove the dump and swap filesystems from the snapshot, and finally send the snapshot to another location.

From what Ive read I expected the initial size of swap in the snapshot to be very small in size, but unfortunatly  I get a "cannot create snapshot 'rpool/swap@restore_snapshot': out of space' error when I try to make the recursive rpool snapshot (eventhough there is 11.7 G space available.)

My best guess was that the "refreservation" value of rpool/swap (which set to 16.5 G) might cause the snapshot to claim more space than available, but ruled that out after i managed to make a 0K snapshot of rpool/swap on another server which had the same refreservation for rpool/swap.