Since Fpolicy servers are external to the Storage Controller, the usage of pBlks increase as each request from the client accounts for one pBlk and the scan request to the Fpolicy Server accounts for ...Since Fpolicy servers are external to the Storage Controller, the usage of pBlks increase as each request from the client accounts for one pBlk and the scan request to the Fpolicy Server accounts for a second pBlk. The sooner the Fpolicy server can complete the scan request, the sooner Data ONTAP can respond to the original client request and free up the pBlk.