1 EXHIBIT 23.1 INDEPENDENT AUDITOR'S CONSENT We consent to the incorporation by reference in this Registration Statement of Network Appliance, Inc. on Form S-8 of our report dated May 14, 1999 (June 17, 1999 as to the fourth paragraph of Note 3), appearing in the Annual Report on Form 10-K of Network Appliance, Inc. for the year ended April 30, 1999. /s/ DELOITTE & TOUCHE LLP San Jose, California March 10, 2000