I was working on this case for one of my customer's with Netapp on conference.
vCenter version was 5.5 U3
Netapp VSC was 6.1
Netapp confirmed that there is a known issue with VSC 6.1 with an open bug for a patch release in future.
Quite not sure about older versions of VSC.
Restarting the vCenter service kills the task, but it initiates it again. In my case it was 6.30 AM
Suhas