Hi All,
I am also having the same issue with snapshots being reported as 0kb. I am running ONTAP v7.3.4 on a FAS2020.
I cannot run the wafl scan ownblocks_calc command as it is unavailable to me. According to http://now.netapp.com/NOW/cgi-bin/bugrellist?bugno=142292, this bug is fixed in this version of ONTAP but it clearly isn't!
I also found an article in the community which said that deleting the rstsnap_ restore snapshots would clear the problem - I've also tried that to no avail.
I appreciate that this is purely a reporting bug and that the data is safe but I'm concerned that I may get no warning that my volume is running out of space as and when it approaches it's limit.
Thanks