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                                                                    EXHIBIT 10.2

                                October 11, 2000

CastleRock Partners
Attn: Maria Lamari-Burden
101 Park Avenue
6th Floor
New York, NY 10178

        RE: AUSPEX SYSTEMS, INC. - SHARE PURCHASE AGREEMENT

Dear Ms. Lamari-Burden:

        Auspex Systems, Inc., (the "Company"), is requesting that you amend the
Share Purchase Agreement dated September 19, 2000. As you are aware, the Company
engaged Halpern Capital Management, Inc. ("Halpern") as a placement agent in the
recent private placement of the Company's Common Stock. The Company would like
to pay part of the placement fee to Halpern in the form of a warrant to purchase
566,048 shares of Common Stock. The exercise price per share of the warrant will
be $7.9625, which is the price that you paid for your shares under the Share
Purchase Agreement.

        The terms of the Share Purchase Agreement prohibit the Company from
including the shares subject to this warrant in the registration statement on
Form S-3. The Company is requesting that you amend Sections 7.1.1(j) and (k) to
state as follows:

        7.      Form D Filing; Registration; Compliance with the Securities Act;
                Covenants.

                7.1     Form D Filing; Registration of Shares.

                        7.1.1   Registration Statement; Expenses.

        The Company, which as of the date of Closing is eligible to use a Form
        S-3 registration statement, shall: . . .

                (j)     not allow any shareholders other than the Purchasers and
                        Baruch Halpern and Shoshana Halpern, to include their
                        shares in the Registration Statement;

                (k)     not file another registration statement or make any
                        other offers of securities, either of which would cause
                        the offering of the Shares to be integrated with any
                        other securities offering of the Company, except that
                        the Company may file any registration statement required
                        pursuant to that certain Registration Rights Agreement
                        between the Company and certain buyers dated January 18,
                        2000 and may issue shares pursuant to conversion of the
                        Series B Preferred Stock and pursuant to a warrant and a
                        warrant purchase agreement with Baruch Halpern and
                        Shoshana Halpern;

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October 11, 2000
Page 2

        In addition, the Company would like to amend the Representations,
Warranties and Covenants Section of the Share Purchase Agreement with respect to
the capitalization of the Company as follows:

                4.2     Capitalization . . .

                        (d)     The Company has reserved 1,605,136 shares of
                                Common Stock for issuance upon the exercise of
                                outstanding warrants to purchase Common Stock
                                and the Company expects to reserve 566,048
                                shares of Common Stock for exercise of warrants
                                that the Company anticipates issuing to the
                                placement agent.

        If you agree to amend the Share Purchase Agreement as stated above,
please sign and date this letter as noted below and return it to the undersigned
by facsimile at (650) 461-5375.

        Please call Gina Christopher at Wilson Sonsini Goodrich and Rosati at
(650) 565-3540 if you have any questions about this letter.

                                       Sincerely,

                                       WILSON SONSINI GOODRICH
                                       & ROSATI
                                       Professional Corporation

                                       Gina M. Christopher

        I hereby agree to amend the Share Purchase Agreement as described above.

        Shareholder: CastleRock Partners, L.P.
                     ----------------------------
        By:
                     ----------------------------
        Name:
                     ----------------------------
        Title:
                     ----------------------------
        # of shares: 326,531
                     ----------------------------
        Date:
                     ----------------------------

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October 11, 2000
Page 3

        I hereby agree to amend the Share Purchase Agreement as described above.

        Shareholder: CastleRock Fund, Ltd.
                     ----------------------------
        By:
                     ----------------------------
        Name:
                     ----------------------------
        Title:
                     ----------------------------
        # of shares: 145,683
                     ----------------------------
        Date:
                     ----------------------------

        Shareholder: CastleRock Partners II, L.P.
                     ----------------------------
        By:
                     ----------------------------
        Name:
                     ----------------------------
        Title:
                     ----------------------------
        # of shares: 30,141
                     ----------------------------
        Date:
                     ----------------------------<PAGE>   1
                                                                    Exhibit 10.3

                            HALPERN CAPITAL ADVISORS
                      A division of Magna Securities Corp.

                         575 Lexington Avenue, 4th Floor
                               New York, NY 10022
                               Phone: 212-527-7540
                                Fox 212-627-7543
                       Email: bhalpern@halperncapital.com

September 27, 2000

Auspex Systems, Inc.
2800 Scott Blvd
Building D
Santa Clara, CA 95050

Attention: Gary Sbona

Gentlemen,

        This letter agreement (this "Agreement") will confirm the understanding
and agreement between Auspex Systems, Inc. (Auspex) and Halpern Capital Advisors
(HCA), a division of Magna Securities Corp., an SEC registered broker-dealer, as
follows:

        1. Auspex hereby engages HCA to provide capital raising services in
connection with a private placement of equity securities (the "'private
placement"). HCA shall use its best efforts to raise capital from investors
pursuant to the terms and conditions of the private placement and in accordance
with all applicable laws governing private placement transactions. If requested
by Auspex, HCA will advise Auspex generally with respect to any financial
transactions or related matters that may arise in connection with the private
placement,

        2. As compensation for the capital raising services rendered by HCA
pursuant to this Agreement, Auspex shall pay to HCA the following fees:

               (a) a 5% cash payment fee payable on the aggregate dollar amount
of funds raised pursuant to the private placement;

               (b) warrants to purchase an amount of common stock equal to 5% of
the total number of shares of common stock issued pursuant to the private
placement.

Under the compensation arrangement, Auspex shall pay to HCA a cash payment
equal to 5% of $90,143,088 or the precise amount of $4,507,154.40. HCA shall
further be entitled to warrants equal to 5% of 11,320,953 shares issued or
566,048 shares at an exercise price of $7.9625.

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The, cash payment due HCA pursuant to this Agreement may be satisfied in three
equal payments, The first cash payment shall be due immediately upon execution
of this Agreement. The second cash payment shall be due within 15 days of
execution of this Agreement. The third cash payment shall be due on January 1,
2001, Payments shall be made to the order of Magna Securities Corp.

The warrants shall be issued to the following individuals in the precise number
of shares specified as follows:

Baruch Halpern and Shoshana Halpern                531,048 shares
John Horcher                                       35,000 shares

        3. In addition to the compensation payable hereunder, Auspex shall
reimburse HCA, upon request by HCA from time to time, for all reasonable
out-of-pocket expenses (including, without limitation, professional fees and
disbursements, travel expenses, postage, copying and phone charges) incurred by
HCA in connection with the services rendered by FICA pursuant to this Agreement.

        4. Auspex shall:

               (a) indemnify and hold HCA harmless against any and all losses,
claims, damages or liabilities to which HCA may become subject arising out of or
in connection with any of the services rendered by HCA pursuant to this
Agreement, unless such losses, claims, damages or liabilities art finally
judicially determined to have resulted directly from the gross negligence or
willful misconduct of HCA; and

               (b) reimburse HCA immediately for any legal or other expenses
reasonably incurred by HCA in connection with investigating, preparing to defend
or defending, or providing evidence in or preparing to serve or serving as a
witness with respect to, any lawsuits, investigations, claims or other
proceedings arising in any manner out of or in connection with the rendering of
services by HCA pursuant to this Agreement (including, without limitation, in
connection with the enforcement of this Agreement and the indemnification
obligations set forth herein).

        Auspex agrees that the indemnification and reimbursement commitments set
forth in this paragraph 4 shall apply whether or not HCA is a formal party to
any lawsuits, claims or other proceedings and that such commitments shall extend
upon the terms set forth in this paragraph to any controlling person, affiliate,
director, officer, employee or agent of HCA (each, with HCA, an "Indemnified
Person"). Auspex further agrees that, without HCA's prior written consent, which
consent shall not be unreasonably withheld, it will not enter into any
settlement of a lawsuit, claim or other proceeding arising out of or in
connection with the private placement unless such settlement includes an express
and unconditional release from the party bringing the lawsuit, claim or other
proceeding of all Indemnified Persons.

        Auspex further agrees that the Indemnified Persons are entitled to
retain separate counsel of their selection in connection with any of the matters
in respect of which indemnification, reimbursement or contribution may be sought
under this Agreement, provided that, in connection

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with any one action or proceeding, HCA shall not be responsible for the fees and
expenses of more than one separate law firm or individual attorney in any one
jurisdiction for all Indemnified Persons.

        5. If Auspex shall at any time, or from time to time, file with the
Securities and Exchange Commission a registration statement under the Securities
Act of 1933, as amended (the "Securities Act"), with respect to any of the
common shares or other securities, if any, issued pursuant to the private
placement, HCA shall be advised in writing thirty (30) days in advance of any
such filing. FICA shall then have the right to include a part or all of its
securities received pursuant to this Agreement in any such registration
statement, unless the underwriter and President and Chief Executive Officer of
Auspex certify in writing to HCA that the inclusion of HCA's securities would
significantly adversely affect the marketing of the offer covered by that
registration statement. Auspex will not be responsible for FICA's legal fees,
underwriting commissions or other expenses related to the filing of a
registration statement under the Securities Act,

        6. This Agreement constitutes the entire agreement between the parties
and may not be amended or modified except in writing signed by each of the
parties.

        7. This Agreement shall be governed by and construed and enforced in
accordance with the laws of the State of New York. Auspex and HCA hereby consent
to submit to the exclusive jurisdiction of the courts of the State of New York
and to the United States District Courts located in the City of New York for any
lawsuits, actions or other proceedings arising out of or in connection with this
Agreement.

        8. Auspex further agrees that service of any process by mail to Auspex's
address set forth above shall be effective service of process for any proceeding
relating to this Agreement in the courts of the State of New York or the United
States District Court located in the City of New York. Auspex shall promptly
provide HCA with written notice of any change in address from the address set
forth above.

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        If the foregoing terms and conditions correctly set forth Auspex's
understanding of our agreement, please indicate such acceptance by signing and
returning to me the enclosed copy of this letter.

Sincerely,

HALPERN CAPITAL ADVISORS

 /s/  Baruch Halpern
-----------------------------------
By: Baruch Halpern

CC: Denis Dunnigan (Auspex)
    Pew Simpson (Auspex)

Agreed:

AUSPEX SYSTEMS, INC,

 /s/ Gary J. Sbona
-----------------------------------
By:  Gary J. Sbona

Auspex Systems, Inc.

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