Document:

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                                                                    EXHIBIT 10.8

July 17, 2003
By Hand Delivery
Steve Goldman

Offer Letter

Dear Steve:

     On behalf of Isilon Systems, Inc. (the "Company"), I am pleased to offer
you the position of Chief Executive Officer and President of the Company.
Speaking for myself, as well as the other members of the Company's Board of
Directors, we are all very impressed with your credentials and we look forward
to your future success in this position. The terms of your new position with the
Company are as set forth below.

     1. POSITION.

          a. You will become the Chief Executive Officer and President of the
Company, working out of the Company's headquarters in Seattle, Washington. As
CEO and President, you will be the most senior executive officer of the Company
and will report to the Company's Board of Directors (the "Board") and have
overall charge of and responsibility for the business and affairs of the
Company. In addition, we expect that you will be appointed as a member of the
Board at the Board's next regularly scheduled meeting and nominated by the Board
at each meeting of stockholders as a director of the Company for so long as you
remain CEO and President.

          b. You agree to the best of your ability and experience that you will
at all times loyally and conscientiously perform all of the duties and
obligations of the CEO and President which are required of you under this
letter, and to the reasonable satisfaction of the Company. During your
employment, you further agree that you will devote substantially all of your
business time and attention (excluding any periods of vacation and medical or
sick leave) to the business of the Company. During your employment, the Company
will be entitled to all of the benefits and profits arising from or incident to
all such work, services and advice, and you will not render commercial or
professional services of any nature to any person or organization, whether or
not for compensation, without the prior written consent of the Board. You will
not directly or indirectly engage or participate in any business that is
competitive in any manner with the business of the Company. Nothing in this
letter agreement will prevent you from accepting speaking, lecture or
presentation engagements in exchange for honoraria or from owning no more than
two percent (2%) of the outstanding equity securities of a corporation whose
stock is listed on a national stock exchange.

     2. START DATE. Subject to fulfillment of any conditions imposed by this
letter agreement, you will commence this new position with the Company as soon
as possible, and such date will be referred to as your "Start Date," but it is
expected that your Start Date will not be later than August 25th, 2003. If you
cannot commence full-time employment by such date, this offer will be withdrawn
with no further obligation on either our or your part.

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July 17, 2003
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     3. PROOF OF RIGHT TO WORK. For purposes of federal immigration law, you
will be required to provide to the Company documentary evidence of your identity
and eligibility for employment in the United States. Such documentation must be
provided to us within three (3) business days of your Start Date, or our
employment relationship with you may be terminated.

     4. CASH COMPENSATION.

          a. BASE SALARY. You will be paid a cash salary of $18,750 per month,
subject to applicable withholding taxes, which is equivalent to $225,000 on an
annualized basis. Your salary will be payable pursuant to the Company's regular
payroll policy (or in the same manner as paid to other officers of the Company),
which is currently one payment every two weeks.

          b. BONUS. For your first twelve (12) months of employment, your target
performance-based bonus will be $75,000. The bonus will be paid in four parts:
up to $18,750 at the end of three (3) months of employment, $18,750 at the end
of six (6) months of employment, $18,750 at the end of nine (9) months of
employment and up to $18,750 at the end of twelve (12) months of employment. The
performance objectives for each quarter's target cash bonus will be mutually
determined by you and the Board upon commencement of your employment.

          c. COMPENSATION REVIEW. The Board or its Compensation Committee at the
end of each calendar year during your employment will review your salary and any
eligibility you may have for discretionary or incentive bonuses.

     5. EQUITY INTEREST.

          a. INITIAL GRANT. In connection with the commencement of your
employment, the Board will grant you an option (the "Option") to purchase
3,080,000 shares (4.5% of the current fully-diluted shares) of the Company's
Common Stock (the "Shares") with an exercise price equal to the fair market
value on the date of the approval of such grant by the Board. The Shares will
vest (meaning that you earn the right to retain Shares, including, if you
purchased unvested Shares, the Company's right to repurchase the unvested Shares
at your original purchase price lapses) at the rate of 25% of the Shares on the
twelve (12) month anniversary of your Start Date, and the remaining Shares will
vest monthly thereafter at the rate of l/48th of the total number of Shares per
month. Vesting will, of course, depend on your continued employment with the
Company. The Option will be an incentive stock option to the maximum extent
allowed by the tax code and will be subject to the terms of the Company's 2001
Stock Plan (the "Plan") with exceptions outlined in Section 5(e) of this letter
agreement and the Stock Option Agreement and related documentation between you
and the Company.

          b. EARLY EXERCISE. The Board will offer you the option of exercising
the Option within 6 months of your option grant being approved by the Board.
Should you choose this early exercise alternative: (i) you will be required to
pay the full cost of exercising the Options, by cash, check or wire transfer of
immediately available funds, within 6 months of the Option being approved

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July 17, 2003
Page 3

by the Board, and (ii) initially all of your exercised Shares will be subject to
being repurchased by the Company should your employment with the Company be
terminated for any reason. On the twelve (12) month anniversary of your Start
Date, 25% of the Shares will be released from this repurchase agreement, and the
remaining Shares will be released from this repurchase agreement at the rate of
l/48th of the total number of Shares per month. Release of shares from this
repurchase agreement will, of course, depend on your continued employment with
the Company. Should the Company exercise its option to repurchase your unvested
shares, the Company will repurchase them at a price equivalent to the lower of
your original exercise price per share and the fair market value per share on
the date of repurchase, as determined by the Board. The early exercise agreement
will impose restrictions on unvested shares, including, but not limited to,
limitations on transfer, voting privileges, and escrow of unvested shares.

          c. EQUITY BONUS. For your first twelve (12) months of employment, your
maximum target performance-based equity bonus will be an option to purchase
684,000 shares (1.0% of the current fully-diluted shares) of the Company's
Common Stock, which shall be subject to the Plan with exceptions outlined in
Section 5(e) of this Agreement. The bonus option will be granted in two parts:
up to 342,000 shares at the end of six (6) months of employment and up to
342,000 at the end of twelve (12) months of employment. Such option will have an
exercise price equal to the fair market value on the date of the approval of
such grant by the Board and shall vest monthly over four years from your Start
Date. The performance objectives for the six month and twelve month target
equity bonuses will be mutually determined by you and the Board upon
commencement of your employment.

          d. PREFERRED EQUITY WARRANT. At the time of the Preferred Series C
financing, provided you are the President and CEO of the Company, you will be
issued a warrant to purchase up to .5% (one-half of one percent) on a
fully-diluted basis of the Company at the per share price of the Series C. This
warrant will not be subject to vesting and will expire at the earlier of (i) 4
years from your Start Date, (ii) an IPO or (iii) a sale of the company or (iv)
three-year exercise period from the date of Close of the Series C.

          e. CHANGE OF CONTROL. Section 14(c)(iv) of the Plan shall not be
applicable to option grants outlined in this letter agreement. The option grants
outlined in this letter agreement will be governed by the remaining provisions
of Section 14(c) of the Plan, subject to the following:

               (i) If a Change of Control (as defined in the Plan) occurs and
your employment is terminated by the Company or any successor without Cause (as
defined below) or you terminate your employment with the Company or any
successor for Good Reason (as defined below) within one year following the
closing of such Change of Control, and your options shall have been assumed or
replaced as contemplated by Section 14(c)(ii) of the Plan, then there will be an
immediate acceleration of vesting with respect an additional 50% of the
remaining unvested portion of your options, effective as of the date of
termination of your employment; provided, however, that if a Change of Control
occurs and your employment is terminated by the Company or any successor

                                      -3-

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July 17, 2003
Page 4

without Cause or you terminate your employment with the Company or any successor
for Good Reason after such Change of Control but prior to the twelve-month
anniversary of your Start Date, and your options shall have been assumed or
replaced as contemplated by Section 14(c)(ii) of the Plan, then there will be an
immediate acceleration of vesting with respect to only an additional 33%
(instead of 50%) of the remaining unvested portion of your options, effective as
of the date of termination of your employment.

               (ii) Any acceleration of vesting pursuant to clause (i) above
shall be in addition to the automatic acceleration of vesting with respect to
25% of the total number of shares subject to your options pursuant to Section
14(c)(ii) of the Plan.

               (iii) In the event of a Corporate Transaction in which the
Successor Corporation does not agree to assume your options or to substitute
equivalent options or rights, your options shall automatically be accelerated
completely so that 100% of the number of shares covered by your options shall be
fully vested immediately prior to the consummation of the Corporate Transaction.

               (iv) "Good Reason" is defined as (1) any action by the Company or
any successor that results in a diminution of your position, authority, duties,
responsibilities, compensation or benefits without your written consent, (2) any
failure by the Company or any successor to comply with any provision of this
letter agreement, (3) the Company's or any successor's requiring you to be based
at any office or location more than 30 miles from your office location as of the
Start Date, or (4) any failure by a successor to the Company to assume the
Company's obligations under this letter agreement.

               (v) "Cause" for termination will exist if you are terminated for
any of the following conduct that has caused or is reasonably expected to result
in material injury to the Company: (i) your willful failure substantially to
perform your duties and responsibilities to the Company or deliberate violation
of a Company policy; (ii) your commission of any act of fraud, embezzlement,
dishonesty or any other willful misconduct; (iii) unauthorized use or disclosure
by you of any proprietary information or trade secrets of the Company or any
other party to whom you owe an obligation of nondisclosure as a result of your
relationship with the Company; or (iv) your willful breach of any of your
obligations under any written agreement or covenant with the Company.

               (vi) The treatment of your options with respect to acceleration
of vesting upon any termination of your employment following a Change of Control
will be at least as favorable as the treatment for any options (or lapsing of
repurchase rights for awards) awarded to any other executive officer (officers
having the title of Vice President and more senior officers) of the Company on
or after the date of this letter agreement.

               (vii) The foregoing provisions shall be applicable to the options
granted hereunder and any replacement options granted by a successor to the
Company.

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July 17, 2003
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          f. POST-TERMINATION EXERCISE PERIOD. Notwithstanding Section 10(b)(i)
of the Plan, in the event of termination of your employment with the Company or
a successor company other than upon your disability or death, or for Cause (as
defined above), you may exercise your options for three months following such
termination to the extent that you are entitled to exercise them at the date of
such termination. The foregoing provision shall be applicable to the options
granted hereunder and any replacement options granted by a successor to the
Company.

     6. BENEFITS.

          a. EMPLOYEE BENEFITS. You and your eligible family members will be
entitled to participate, to the extent you are eligible under the terms and
conditions thereof, in any medical insurance plans, 401(k) plans, deferred
compensation plans, life insurance plans, vacation, retirement or other employee
benefit plans or fringe benefit plans or perquisites which are generally
available to the most senior executives of the Company and which may become
effective from time to time during your employment with the Company.

          b. INDEMNIFICATION. The Company currently indemnifies all officers and
directors to the maximum extent permitted by law, and you will enter into the
Company's standard form of Indemnification Agreement giving you such protection.
Pursuant to the Indemnification Agreement, the Company will agree to advance any
expenses for which indemnification is available to the extent allowed by
applicable law. You shall be covered by all directors and officers insurance
policies in place during your employment, providing protection at least
comparable to present coverage.

          c. VACATION. You will be entitled to three weeks paid time off per
year (including vacation time and sick time off), pro-rated for the remainder of
this calendar year. To the extent that the Company allows a longer period for
any of its most senior executive officers, you shall be entitled to the longer
period.

     7. SEVERANCE BENEFITS.

          a. GENERAL. In the event of termination of your employment under any
circumstances, you will not be entitled to any benefits (other than those you
are due under applicable law) except as set forth in this Section 7 and Section
5(e) above.

          b. TERMINATION. Subject to Section 7(c) below, if the Company
terminates your employment for any reason other than for Cause, or you resign
all of your positions with the Company for Good Reason, you will be entitled to
receive a continuation of your then current base salary or $125,000 on an
annualized basis, whichever is higher, and reimbursement of COBRA payments for a
period of six (6) months (the "Severance Period"), paid in accordance with the
Company's normal payroll practices. To the extent that you receive cash
compensation and/or obtain health benefits from another employer or pursuant to
a consulting relationship during the Severance Period, if applicable, base
salary continuation payments hereunder shall be reduced by the amount of

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July 17, 2003
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such cash compensation and/or, if applicable, reimbursement of COBRA payments
will cease to the extent that you cease to make COBRA payments because of such
health benefits. You agree that you will notify the Company of your obtaining
employment or a consulting agreement, and the relevant terms thereof, during the
Severance Period. You will not be entitled to any additional payments, salary,
bonus or benefits in the event of termination for Cause.

          c. CONDITIONS. Any payments made under Section 7(b) above shall be
subject to applicable tax withholding, and your receipt of such payments shall
be subject to your executing the Company's (or its successor's) standard form
release of claims releasing the Company and its successor(s) from claims
relating to your employment relationship and termination of that relationship.
Nothing in this Section 7 in any way modifies Section 10 below.

     8. PROPRIETARY INFORMATION AND INVENTION ASSIGNMENT AGREEMENT. Your
acceptance of this offer and commencement of employment with the Company is
contingent upon the execution, and delivery to an officer of the Company, of the
Company's Proprietary Information and Invention Assignment Agreement, a copy of
which is enclosed for your review and execution (the "Confidentiality
Agreement"), prior to or on your Start Date.

     9. NO CONFLICTS. You represent that your performance of all the terms of
this letter agreement will not breach any other agreement to which you are a
party.

     10. AT-WILL EMPLOYMENT. Notwithstanding anything to the contrary in this
letter agreement, your employment with the Company is for an indefinite term and
will at all times be on an "at will" basis, meaning that, subject to applicable
legal requirements, either you or the Company may terminate your employment at
any time for any reason or no reason, without further obligation or liability
except as otherwise expressly set forth herein and in the Confidentiality
Agreement.

     11. LEGAL REPRESENTATION. You acknowledge that the Company has recommended
that you retain outside legal counsel in connection with the negotiation of this
Agreement and that the Company's counsel is representing only the Company in
connection with this letter and negotiations relating to your employment.

     12. ARBITRATION. In the event that any disputes or claims arise relating to
your employment relationship with the Company, including this letter agreement,
you agree to submit such disputes or claims to arbitration in accordance with
the rules of the American Arbitration Association by one arbitrator appointed in
accordance with said rules. You and the Company shall share equally in the cost
of the arbitration to the extent permitted by law. Each party shall bear its own
attorney fees, unless otherwise determined by the arbitrator. The arbitrator
shall apply Washington law, without reference to rules of conflicts of law or
rules of statutory arbitration, to the resolution of any dispute. Judgement on
the award rendered by the arbitrator may be entered in any court having
jurisdiction thereof. Notwithstanding the foregoing, the parties may apply to
any court of competent jurisdiction for preliminary or interim equitable relief,
or to compel arbitration in

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July 17, 2003
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accordance with this paragraph, without breach of this arbitration provision.
This Section 12 shall not apply to any dispute or claim relating to the
Confidentiality Agreement.

     13. CHOICE OF LAW. This letter agreement shall be governed by the laws of
the State of Washington, without regard to its conflicts of law provisions. The
parties agree that any actions or proceedings arising under this agreement that
result in litigation shall be litigated in state or federal court in the State
of Washington. The parties consent to the jurisdiction and venue of the
foregoing courts.

     We are all delighted to be able to extend you this offer and look forward
to working with you. To indicate your acceptance of the Company's offer, please
sign and date this letter in the space provided below and return it to me. This
letter agreement sets forth the terms of your employment with the Company and
supersedes any prior representations or agreements, whether written or oral.
This letter agreement may be executed in one or more counterparts and may be
executed by facsimile. This letter agreement may not be modified or amended
except by a written agreement, signed by the Company and by you.

Very Truly yours,

/s/ Matt McIlwain
-------------------------------------
Isilon Systems, Inc.
Matt McIlwain
Board Member

ACCEPTED AND AGREED:

Steve Goldman

Signature /s/ Steve Goldman
          ---------------------------
Date 7-18-03

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                                                                    EXHIBIT 10.9

October 4, 2002

Eric Scollard

Dear Eric:

     It gives me great pleasure to offer you the position of Vice President of
Sales for Isilon Systems, Inc. ("Isilon" or the "Company"). We believe that you
will add substantially to the team and contribute greatly to the ultimate
success of the Company by providing Isilon with the same extraordinary sales
leadership that you have demonstrated throughout your career. The Board of
Directors, the existing Isilon team and I look forward to you joining the
Company and helping us build Isilon into one of the most important companies
driving the next generation of storage solutions.

     We understand and appreciate the nature of the commitment you are making to
join Isilon, and we want you to do so with great confidence. You have the
qualities that distinguish successful executives: leadership, high integrity,
intelligence, a bias to action, and a desire to make a difference. We are
extremely enthusiastic about your accepting this offer.

     The Company is pleased to offer you employment on the following terms:

POSITION

     Your assignment with the Company as Vice President of Sales, working out of
the Company's headquarters office in Seattle, Washington. You will report to the
President and Chief Executive Officer. By signing this letter agreement, you
confirm to the Company that you have no contractual commitments or other legal
obligations that would prohibit you from performing your duties for the Company.

START DATE

     Subject to fulfillment of any condition imposed by this letter agreement,
you will begin this new position with the company no later than October 24,
2002.

PROOF OF RIGHT TO WORK

     This offer of employment is contingent upon you presenting, in accordance
with applicable law, verification of your identity and your legal right to work
in the United States. In the event that you do not possess, or are unable to
obtain authorization to accept employment in the United States, our offer of
employment is withdrawn.

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COMPENSATION

          -    BASE SALARY. You will be paid a monthly salary of $14,584, which
               is equivalent to $175,000 on an annual basis. Your salary will be
               payable in twenty-six equal payments, one payment every two
               weeks, pursuant to the Company's regular payroll policy and will
               be subject to applicable withholding taxes.

          -    BONUS. Your target bonus for calendar year 2003 will be $125,000.
               The criteria for you to receive this bonus will be determined
               jointly by you and Isilon's CEO before January 1, 2003. Unless
               mutually agreed otherwise, 40% of this bonus will be subject to
               the fulfillment of certain objectives which will be outlined
               before January 1, 2003. Unless mutually agreed otherwise, 60% of
               this bonus will be linked to revenue goals and will include a "2x
               multiplier" after your sales team has delivered the revenue goal.

          -    SIGNING BONUS. You will be paid a $20,000 signing bonus at the
               close of the first pay period.

          -    ADDITIONAL BONUS. You will be paid $500 per month car allowance,
               to be treated as taxable income.

          -    ANNUAL REVIEW. Your base salary will be reviewed annually, as
               part of the Company's normal salary review process.

STOCK OPTIONS

          -    INITIAL OPTION GRANT. In connection with the commencement of your
               employment, the Company will recommend that the Board of
               Directors grant you an option to purchase 616,900 shares of the
               Company's Common Stock with an exercise price equal to the fair
               market value on the date of the grant. These option shares will
               vest at the rate of 25% of the shares on the twelve (12) month
               anniversary of your Vesting Commencement Date (which will be the
               date your full-time employment with the Company commences) and
               the remaining shares will vest monthly thereafter at the rate of
               1/48 of the total number of shares per month. Vesting will, of
               course, depend on your continued employment with the Company. The
               option will be an incentive stock option to the maximum extent
               allowed by the tax code and will be subject to the terms of the
               Company's 2001 Stock Option Plan and the Stock Option Agreement
               between you and the Company.

          -    INITIAL OPTION, EXERCISE PRICE PROTECTIVE PROVISION. In the event
               that the fair market value (FMW) on the date of the grant is
               higher than $0.05, the company will grant your "Initial Option
               Grant" below FMV, at $0.05.

          -    EARLY EXERCISE PROVISION. In recognition of risks associated with
               joining a startup at an early stage, the Company will recommend
               that the Board of Directors offer you the option of exercising
               your "Initial Option Grant", as described above, within 15

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               days of your option grant being approved by the Company's Board
               of Directors. Should you choose this early exercise elective:

                    -    You will be required to pay the full cost of exercising
                         your options, to the Company, within 15 days of your
                         option grant being approved by the Company's Board of
                         Directors

                    -    Initially all of your exercised shares will be subject
                         to being repurchased by the company should your
                         employment with the company be terminated for any
                         reason. On the twelve (12) month anniversary of your
                         Vesting Commencement Date (which will be the date your
                         full-time employment with the company commences), 25%
                         of your shares will be released from this repurchase
                         agreement and the remaining shares will be released
                         from this repurchase agreement at the rate of 1/48 of
                         the total number of shares per month. Release of shares
                         from this repurchase agreement will, of course, depend
                         on your continued employment with the Company. Should
                         the Company exercise its option to repurchase your
                         shares; the Company will repurchase them a price
                         equivalent to your original price per share.

                    -    The early exercise agreement will impose restrictions
                         on unvested shares, including, but not limited to,
                         limitations on transfer, voting privileges, and escrow
                         of unvested shares.

          -    SUBSEQUENT OPTION GRANTS. At the discretion of the Company's
               Board of Directors, you may be eligible to receive additional
               grants of stock options or purchase rights from time to time in
               the future, on such terms and subject to such conditions as the
               Board of Directors shall determine as of the date of such grant.

BENEFITS

          -    INSURANCE BENEFITS. The Company will provide you with standard
               medical and dental insurance benefits according to Company
               policy.

          -    VACATION. You will be entitled to vacation according to Company
               policy.

SEVERANCE BENEFITS

          -    TERMINATION WITHOUT CAUSE PRIOR TO A CHANGE OF CONTROL. In the
               event that the Company terminates your employment for any reason
               other than Cause or Permanent Disability (as such terms are
               defined below), prior to a Change of Control of the Company (as
               defined in the Company's 2001 Stock Option Plan), the Company
               will provide you the following severance benefits: (1)
               continuation of your base salary at the rate in effect at the
               time of termination of your employment for a period of four (4)
               months (the "Severance Period"), payable in accordance with the
               Company's standard payroll procedures; (2) if you elect to
               continue your health insurance

                                       -3-

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               coverage under the Consolidated Omnibus Budget Reconciliation Act
               ("COBRA") following the termination of your employment, the
               Company will pay your monthly premium under COBRA until the
               earliest of (a) the last day of the Severance Period, (b) the
               expiration of your continuation coverage under COBRA or (c) the
               date when you receive substantially equivalent health insurance
               coverage in connection with new employment or self-employment;
               and (3) you will be entitled to accelerated vesting of your
               Option shares as follows: the number of vested shares will be
               determined by adding three (3) months to the actual period of
               service that you have completed with the Company as of your
               termination date. In the event your termination occurs within
               your first year of employment, the Company will first convert
               your vesting to a monthly schedule such that you will receive one
               (1) month vesting for each full month of employment and then to
               that number of months will be added three (3) months to calculate
               the total number of months of vesting you will be entitled to as
               of your termination date.

          -    INVOLUNTARY TERMINATION PRIOR TO A CHANGE OF CONTROL. In the
               event that the Company hires a new Chief Executive Officer to
               replace Sujal Patel prior to a Change of Control and you are
               subject to Involuntary Termination (as defined below) within 6
               months following the date that the new Chief Executive Officer
               commences employment, and the Company will provide you the
               severance benefits described above. In the event your termination
               occurs within your first year of employment, the Company will
               first convert your vesting to a monthly schedule such that you
               will receive one (1) month vesting for each full month of
               employment and then to that number of months will be added three
               (3) months to calculate the total number of months of vesting you
               will be entitled to as of your termination date.

          -    INVOLUNTARY TERMINATION WITHIN TWELVE MONTHS FOLLOWING A CHANGE
               OF CONTROL. In the event you are subject to an Involuntary
               Termination (as defined below) within twelve (12) months
               following a Change of Control, the Company will provide you the
               severance benefits described above and in addition, you will be
               entitled to accelerated vesting as described in the company's
               2001 Stock Option Plan.

     Your entitlement to the severance benefits described above shall be
contingent upon (a) your execution and delivery to the Company of a general
release of claims (in a form prescribed by the Company) of all known and unknown
claims that you may then have against the Company or persons affiliated with the
Company, (b) your return of all Company property, and (c) your resignation from
all of your positions with the Company.

DEFINITIONS

     The following definitions shall apply for purposes of this letter
agreement:

          -    "CAUSE" termination of your Continuous Service will exist if you
               are terminated for any of the following reasons: (a) your willful
               failure substantially to perform your duties and responsibilities
               to the Company or deliberate violation of a Company policy; (b)
               your commission of any act of fraud, embezzlement, dishonesty or
               any

                                       -4-

<PAGE>

               other willful misconduct that has caused or is reasonably
               expected to result in material injury to the Company; (c)
               unauthorized use or disclosure by you of any proprietary
               information or trade secrets of the Company or any other party to
               whom you owe an obligation of nondisclosure as a result of your
               relationship with the Company; or (d) your willful breach of any
               of your obligations under written agreement or covenant with the
               Company. The determination as to whether you are being terminated
               for Cause shall be made in good faith by the Company and shall be
               final and binding.

          -    "CHANGE OF CONTROL" means a sale of all or substantially all of
               the Company's assets, or any merger or consolidation of the
               Company with or into another corporation other than a merger or
               consolidation in which the holders of more than 50% of the shares
               of capital stock of the Company outstanding immediately prior to
               such transaction continue to hold (either by the voting
               securities remaining outstanding or by their being converted into
               voting securities of the surviving entity) more than 50% of the
               total voting power represented by the voting securities of the
               Company, or such surviving entity, outstanding immediately after
               such transaction.

          -    "INVOLUNTARY TERMINATION" means termination of you Continuous
               Service Status under the following circumstances: (a) termination
               without Cause by the Company of a Subsidiary, Parent, Affiliate
               or successor thereto, as appropriate; or (b) voluntary
               termination by you within 30 days following (1) a material
               reduction in your job responsibilities, provided that neither a
               mere change in title alone nor reassignment following a Change of
               Control to a position that is substantially similar to the
               position held prior to the change of Control shall constitute a
               material reduction in job responsibilities; (2) relocation by the
               Company or a Subsidiary, Parent, Affiliate or successor thereto,
               as appropriate, of your work site to a facility or location more
               than 40 miles from your principal work site for the Company at
               the time of the Change of Control; or (3) a reduction in your
               then-current base salary by at least 10%, provided than an
               across-the-board reduction in the salary level of all other
               employees or consultants in positions similar to you by the same
               percentage amount as part of a general salary level reduction
               shall not constitute such a salary reduction.

          -    "PERMANENT DISABILITY" means that you are unable to perform the
               essential functions of your position, with our without reasonable
               accommodation, for a period of at least 120 consecutive days
               because of a physical or mental impairment.

PROPRIETARY INFORMATION AND INVENTIONS AGREEMENT

     Your acceptance of this offer and commencement of employment with the
Company is contingent upon the execution, and delivery to an officer of the
Company, of the Company's Proprietary Information and Invention Assignment
Agreement, a copy of which is enclosed for your review and execution (the
"Assignment Agreement") prior to or on your Start Date.

AT-WILL EMPLOYMENT

                                       -5-

<PAGE>

     Your employment with the Company will be on an "at will" basis, meaning
that either you or the Company may terminate your employment at any time for any
reason or no reason, without further obligation or liability.

REFERENCE CHECKS

     This offer of employment is contingent upon satisfactory reference checks,
to be conducted by Isilon.

ACCEPTANCE

     We are all delighted to be able to extend you this offer and look forward
to working with you. To indicate your acceptance of the Company's offer, please
sign and date this letter in the space provided below and return it to me, along
with a signed and dated copy of the Assignment Agreement, on or before October
8, 2002 at 11:59 pm PST.

     This letter, together with the Assignment Agreement, set forth the terms of
your employment with the Company and supersedes any prior representations or
agreements, whether written or oral. This letter may not be modified or amended
except by a written agreement, signed by the Company and by you.

                            [SIGNATURE PAGE FOLLOWS]

                                       -6-

<PAGE>

                                        Very truly yours,

                                        ISILON SYSTEMS, INC.

                                        By: /s/ Sujal Patel
                                            ------------------------------------
                                        Title: Chief Executive Officer

ACCEPTED AND AGREED:

ERIC SCOLLARD

/s/ Eric Scollard
-------------------------------------
Signature

10/8/02
Date

Enclosure A: Proprietary Information and Invention Assignment Agreement

                                       -7-

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