EXHIBIT 32.2

                    CERTIFICATION OF CHIEF FINANCIAL OFFICER
                                   PURSUANT TO
                             18 U.S.C. SECTION 1350,
                             AS ADOPTED PURSUANT TO
                  SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

    I, Steven J. Gomo, certify, pursuant to 18 U.S.C. Section 1350, as adopted
pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that the Annual
Report of Network Appliance, Inc., on Form 10-K for the fiscal year ended April
30, 2004 fully complies with the requirements of Section 13(a) or 15(d) of the
Securities Exchange Act of 1934, as amended, and that information contained in
such Annual Report on Form 10-K fairly presents in all material respects the
financial condition and results of operations of Network Appliance, Inc.

                                                 /s/ STEVEN J. GOMO
                                        ---------------------------------------
                                                   Steven J. Gomo
                                            Senior Vice President of Finance
                                              and Chief Financial Officer

Date: June 29, 2004