UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                  SCHEDULE 13G

                    Under the Securities Exchange Act of 1934
                               (Amendment No. 1)*

                              STORAGENETWORKS, INC.
                              ---------------------
                                (Name of Issuer)

                     Common Shares, $.01 par value per share
                     ---------------------------------------
                         (Title of Class of Securities)

                                    86211E103
                                    ---------
                                 (CUSIP Number)

                                October 29, 2003
                                ----------------
                      (Date of Event which Requires Filing
                               of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule
is filed:

                                [ ] Rule 13d-1(b)
                                [X] Rule 13d-1(c)
                                [ ] Rule 13d-1(d)

*The  remainder of this cover page shall be filled out for a reporting  person's
initial filing on this form with respect to the subject class of securities, and
for any  subsequent  amendment  containing  information  which  would  alter the
disclosures provided in a prior cover page.

The information required on the remainder of this cover page shall not be deemed
to be "filed" for the purpose of Section 18 of the  Securities  Exchange  Act of
1934 ("Act") or otherwise  subject to the liabilities of that section of the Act
but  shall be  subject  to all other  provisions  of the Act  (however,  see the
Notes).

                          Continued on following pages
                               Page 1 of 14 Pages




                                  SCHEDULE 13G

CUSIP No.  86211E103                                          Page 2 of 14 Pages


1        Names of Reporting Persons
         I.R.S. Identification Nos. of above persons (entities only)

                  MARVIN H. DAVIDSON

2        Check the Appropriate Box If a Member of a Group (See Instructions)

                                               a. [ ]
                                               b. [X]

3        SEC Use Only

4        Citizenship or Place of Organization

                  UNITED STATES

                            5             Sole Voting Power
Number of                                          12,634,899
  Shares
Beneficially                6             Shared Voting Power
  Owned By                                         0
    Each
Reporting                   7             Sole Dispositive Power
    Person                                         12,634,899
    With
                            8             Shared Dispositive Power
                                                   0

9        Aggregate Amount Beneficially Owned by Each Reporting Person

                                    12,634,899

10       Check Box If the Aggregate Amount in Row (9) Excludes Certain
         Shares (See Instructions)

                                    [X]

11       Percent of Class Represented By Amount in Row (9)

                                    12.69%

12       Type of Reporting Person (See Instructions)

                                    IN; HC




                                  SCHEDULE 13G

CUSIP No.  86211E103                                          Page 3 of 14 Pages

1        Names of Reporting Persons
         I.R.S. Identification Nos. of above persons (entities only)

                  THOMAS L. KEMPNER, JR.

2        Check the Appropriate Box If a Member of a Group (See Instructions)

                                               a. [ ]
                                               b. [X]

3        SEC Use Only

4        Citizenship or Place of Organization

                  UNITED STATES

                            5             Sole Voting Power
Number of                                          12,657,439
  Shares
Beneficially                6             Shared Voting Power
  Owned By                                         0
    Each
Reporting                   7             Sole Dispositive Power
    Person                                         12,657,439
    With
                            8             Shared Dispositive Power
                                                   0

9        Aggregate Amount Beneficially Owned by Each Reporting Person

                                    12,657,439

10       Check Box If the Aggregate Amount in Row (9) Excludes Certain
         Shares (See Instructions)

                                    [ ]

11       Percent of Class Represented By Amount in Row (9)

                                    12.72%

12       Type of Reporting Person (See Instructions)

                                    IN; HC





                                  SCHEDULE 13G

CUSIP No.  86211E103                                          Page 4 of 14 Pages


1        Names of Reporting Persons
         I.R.S. Identification Nos. of above persons (entities only)

                  STEPHEN M. DOWICZ

2        Check the Appropriate Box If a Member of a Group (See Instructions)

                                               a.  [ ]
                                               b. [X]

3        SEC Use Only

4        Citizenship or Place of Organization

                  UNITED STATES

                            5             Sole Voting Power
Number of                                          12,657,439
  Shares
Beneficially                6             Shared Voting Power
  Owned By                                         0
    Each
Reporting                   7             Sole Dispositive Power
    Person                                         12,657,439
    With
                            8             Shared Dispositive Power
                                                   0

9        Aggregate Amount Beneficially Owned by Each Reporting Person

                                    12,657,439

10       Check Box If the Aggregate Amount in Row (9) Excludes Certain
         Shares (See Instructions)

                                    [ ]

11       Percent of Class Represented By Amount in Row (9)

                                    12.72%

12       Type of Reporting Person (See Instructions)

                                    IN; HC




                                  SCHEDULE 13G

CUSIP No.  86211E103                                          Page 5 of 14 Pages


1        Names of Reporting Persons
         I.R.S. Identification Nos. of above persons (entities only)

                  SCOTT E. DAVIDSON

2        Check the Appropriate Box If a Member of a Group (See Instructions)

                                               a. [ ]
                                               b. [X]

3        SEC Use Only

4        Citizenship or Place of Organization

                  UNITED STATES

                            5             Sole Voting Power
Number of                                          12,657,439
  Shares
Beneficially                6             Shared Voting Power
  Owned By                                         0
    Each
Reporting                   7             Sole Dispositive Power
    Person                                         12,657,439
    With
                            8             Shared Dispositive Power
                                                   0

9        Aggregate Amount Beneficially Owned by Each Reporting Person

                                    12,657,439

10       Check Box If the Aggregate Amount in Row (9) Excludes Certain
         Shares (See Instructions)

                                    [ ]

11       Percent of Class Represented By Amount in Row (9)

                                    12.72%

12       Type of Reporting Person (See Instructions)

                                    IN; HC




                                  SCHEDULE 13G

CUSIP No.  86211E103                                          Page 6 of 14 Pages


1        Names of Reporting Persons
         I.R.S. Identification Nos. of above persons (entities only)

                  MICHAEL J. LEFELL

2        Check the Appropriate Box If a Member of a Group (See Instructions)

                                               a. [ ]
                                               b. [X]

3        SEC Use Only

4        Citizenship or Place of Organization

                  UNITED STATES

                            5             Sole Voting Power
Number of                                          12,657,439
  Shares
Beneficially                6             Shared Voting Power
  Owned By                                         0
    Each
Reporting                   7             Sole Dispositive Power
    Person                                         12,657,439
    With
                            8             Shared Dispositive Power
                                                   0

9        Aggregate Amount Beneficially Owned by Each Reporting Person

                                    12,657,439

10       Check Box If the Aggregate Amount in Row (9) Excludes Certain
         Shares (See Instructions)

                                    [ ]

11       Percent of Class Represented By Amount in Row (9)

                                    12.72%

12       Type of Reporting Person (See Instructions)

                                    IN; HC




                                  SCHEDULE 13G

CUSIP No.  86211E103                                          Page 7 of 14 Pages


1        Names of Reporting Persons
         I.R.S. Identification Nos. of above persons (entities only)

                  TIMOTHY I. LEVART

2        Check the Appropriate Box If a Member of a Group (See Instructions)

                                               a. [ ]
                                               b. [X]

3        SEC Use Only

4        Citizenship or Place of Organization

                  UNITED KINGDOM

                            5             Sole Voting Power
Number of                                          12,657,439
  Shares
Beneficially                6             Shared Voting Power
  Owned By                                         0
    Each
Reporting                   7             Sole Dispositive Power
    Person                                         12,657,439
    With
                            8             Shared Dispositive Power
                                                   0

9        Aggregate Amount Beneficially Owned by Each Reporting Person

                                    12,657,439

10       Check Box If the Aggregate Amount in Row (9) Excludes Certain
         Shares (See Instructions)

                                    [ ]

11       Percent of Class Represented By Amount in Row (9)

                                    12.72%

12       Type of Reporting Person (See Instructions)

                                    IN; HC




                                  SCHEDULE 13G

CUSIP No.  86211E103                                          Page 8 of 14 Pages


1        Names of Reporting Persons
         I.R.S. Identification Nos. of above persons (entities only)

                  ROBERT J. BRIVIO, JR.

2        Check the Appropriate Box If a Member of a Group (See Instructions)

                                               a. [ ]
                                               b. [X]

3        SEC Use Only

4        Citizenship or Place of Organization

                  UNITED STATES

                            5             Sole Voting Power
Number of                                          12,657,439
  Shares
Beneficially                6             Shared Voting Power
  Owned By                                         0
    Each
Reporting                   7             Sole Dispositive Power
    Person                                         12,657,439
    With
                            8             Shared Dispositive Power
                                                   0

9        Aggregate Amount Beneficially Owned by Each Reporting Person

                                    12,657,439

10       Check Box If the Aggregate Amount in Row (9) Excludes Certain
         Shares (See Instructions)

                                    [ ]

11       Percent of Class Represented By Amount in Row (9)

                                    12.72%

12       Type of Reporting Person (See Instructions)

                                    IN; HC





                                                              Page 9 of 14 Pages

Item 1(a)         Name of Issuer:

                  StorageNetworks, Inc. (the "Issuer")

Item 1(b)         Address of the Issuer's Principal Executive Offices:

                  275 Grove Street, Newton, Massachusetts 02466

Item 2(a)         Name of Person Filing:

                  The  Statement  is filed on  behalf  of each of the  following
persons (collectively, the "Reporting Persons"):

                  i) Marvin H. Davidson ("Mr. Marvin Davidson");

                  ii) Thomas L. Kempner, Jr. ("Mr. Kempner");

                  iii) Stephen M. Dowicz ("Mr. Dowicz");

                  iv) Scott E. Davidson ("Mr. Scott Davidson");

                  v) Michael J. Leffell ("Mr. Lefell");

                  vi) Timothy I. Levart ("Mr. Levart); and

                  vii) Robert J. Brivio, Jr. ("Mr. Brivio").

                  This statement  relates to shares (as defined herein) held for
the accounts of (i) M.H.  Davidson & Co., a New York  corporation  ("CO"),  (ii)
Davidson  Kempner  International,  Ltd., a British  Virgin  Islands  corporation
("DKIL"),  (iii)  Davidson  Kempner  Institutional  Partners,  L.P.,  a Delaware
limited partnership ("DKIP"), (iv) Davidson Kempner Partners, a New York limited
partnership  ("DKP"),  (v) Davidson Kempner  International  Advisors,  L.L.C., a
Delaware  limited  liability  company  ("DKIA"),  and (vi) M.H.  Davidson & Co.,
L.L.C. 401(K) Plan (the "Plan").  The Reporting Persons are the general partners
of CO and the sole  stockholders of Davidson  Kempner  Advisers Inc., a New York
corporation,  the general  partner of DKIP.  The Reporting  Persons are also the
general  partners of MHD  Management  Co., a New York  corporation,  the general
partner of DKP.  Finally,  the Reporting  Persons are the sole  stockholders  of
DKIA,  the manager of DKIL and, in such  capacity,  may be deemed to have voting
and dispositive  power over the Shares held for the account of DKIL. As a result
of these  relationships,  each of the  Reporting  Persons  may be deemed to have
voting and dispositive  power over the Shares held for the accounts of CO, DKIL,
DKIP,  DKP and DKIA.  Each of the Reporting  Persons,  with the exception of Mr.
Marvin  Davidson,  serve as  trustees  of the  Plan.  As a  result,  each of the
Reporting Persons, with the exception of Mr. Marvin Davidson, may also be deemed
to have voting and dispositive power over the Shares held for the account of the
Plan.

Item 2(b)         Address of Principal Business Office or, if None, Residence:

                  The address of the  principal  business  office of each of the
Reporting Persons is 885 Third Avenue, New York, NY 10022.





                                                             Page 10 of 14 Pages

Item 2(c)         Citizenship:

                  1) Mr. Marvin Davidson is a citizen of the United States;

                  2) Mr. Kempner is a citizen of the United States;

                  3) Mr. Dowicz is a citizen of the United States;

                  4) Mr. Scott Davidson is a citizen of the United States;

                  5) Mr. Lefell is a citizen of the United States;

                  6) Mr. Levart is a citizen of the United Kingdom; and

                  7) Mr. Brivio is a citizen of the United States.

Item 2(d)         Title of Class of Securities:

                  Common shares, $.01 par value per share (the "Shares").

Item 2(e)         CUSIP Number:

                  86211E103

Item 3.           If this  statement is  filed pursuant  to  Rule  13d-1 (b), or
                  13d-2(b) or (c), check whether the person filing is a:

                  This Item 3 is not applicable.

Item 4.           Ownership:

Item 4(a)         Amount Beneficially Owned:

                  (1) As of November 3, 2003, Mr. Marvin  Davidson may be deemed
the beneficial owner of 12,634,899  Shares.  Of this amount,  (i) 176,630 Shares
are held for the account of CO, (ii)  5,530,577  Shares are held for the account
of DKIL,  (iii) 219,218 Shares are held for the account of DKIA,  (iv) 4,297,759
Shares are held for the account of DKIP, and (iv) 2,410,715  Shares are held for
the account of DKP.

                  (2) As of November 3, 2003, each of Mr.  Kempner,  Mr. Dowicz,
Mr. Scott  Davidson,  Mr.  Leffell,  Mr. Levart and Mr. Brivio may be deemed the
beneficial owner of 12,657,439  Shares.  Of this amount,  (i) 176,630 Shares are
held for the  account of CO, (ii)  5,530,577  Shares are held for the account of
DKIL,  (iii)  219,218  Shares are held for the account of DKIA,  (iv)  4,297,759
Shares are held for the account of DKIP,  (v) 2,410,715  Shares are held for the
account of DKP, and (v) 22,540 Shares are held for the account of the Plan.


                                                             Page 11 of 14 Pages


Item 4(b)         Percent of Class:

                  (1) The number of Shares of which Mr.  Marvin  Davidson may be
deemed to be the  beneficial  owner  constitutes  12.69% of the total  number of
Shares  outstanding  (based upon information  provided by the Issuer in its most
recent proxy  statement on Schedule  14A, the number of Shares  outstanding  was
99,538,552 as of September 4, 2003).

                  (2) The  number of Shares of which  each of Mr.  Kempner,  Mr.
Dowicz, Mr. Scott Davidson, Mr. Leffell, Mr. Levart and Mr. Brivio may be deemed
to be the  beneficial  owner  constitutes  12.72% of the total  number of Shares
outstanding  (based upon  information  provided by the Issuer in its most recent
proxy statement on Schedule 14A, the number of Shares outstanding was 99,538,552
as of September 4, 2003).

Item 4(c)         Number of shares as to which such person has:

    Mr. Marvin Davidson
    (i)       Sole power to vote or direct
              the vote:                                               12,634,899
    (ii)      Shared power to vote or to
              direct the vote                                                  0
    (iii)     Sole power to dispose or to
              direct the disposition of                               12,634,899
    (iv)      Shared power to dispose or to
              direct the disposition of                                        0

    Mr. Kempner
    (i)       Sole power to vote or direct
              the vote:                                               12,657,439
    (ii)      Shared power to vote or to
              direct the vote                                                  0
    (iii)     Sole power to dispose or to
              direct the disposition of                               12,657,439
    (iv)      Shared power to dispose or to
              direct the disposition of                                        0

    Mr. Dowicz
    (i)       Sole power to vote or direct
              the vote:                                               12,657,439
    (ii)      Shared power to vote or to
              direct the vote                                                  0
    (iii)     Sole power to dispose or to
              direct the disposition of                               12,657,439
    (iv)      Shared power to dispose or to
              direct the disposition of                                        0

    Mr. Scott Davidson
    (i)       Sole power to vote or direct
              the vote:                                               12,657,439
    (ii)      Shared power to vote or to
              direct the vote                                                  0
    (iii)     Sole power to dispose or to
              direct the disposition of                               12,657,439
    (iv)      Shared power to dispose or to
              direct the disposition of                                        0

    Mr. Leffell
    (i)       Sole power to vote or direct
              the vote:                                               12,657,439
    (ii)      Shared power to vote or to
              direct the vote                                                  0
    (iii)     Sole power to dispose or to
              direct the disposition of                               12,657,439
    (iv)      Shared power to dispose or to
              direct the disposition of                                        0





                                                             Page 12 of 14 Pages

    Mr. Levart
    (i)       Sole power to vote or direct
              the vote:                                               12,657,439
    (ii)      Shared power to vote or to
              direct the vote                                                  0
    (iii)     Sole power to dispose or to
              direct the disposition of                               12,657,439
    (iv)      Shared power to dispose or to
              direct the disposition of                                        0

    Mr. Brivio
    (i)       Sole power to vote or direct
              the vote:                                               12,657,439
    (ii)      Shared power to vote or to
              direct the vote                                                  0
    (iii)     Sole power to dispose or to
              direct the disposition of                               12,657,439
    (iv)      Shared power to dispose or to
              direct the disposition of                                        0

Item 5.           Ownership of Five Percent or Less of a Class:

                  This Item 5 is not applicable.

Item 6.           Ownership  of  More  than  Five  Percent  on Behalf of Another
                  Person:

                  (i) The  shareholders  of CO have the right to  participate in
the receipt of dividends  from, or proceeds from the sale of, the Shares held by
CO in accordance with their ownership interests in CO.

                  (ii) The shareholders of DKIL have the right to participate in
the receipt of dividends  from, or proceeds from the sale of, the Shares held by
DKIL in accordance with their ownership interests in DKIL.

                  (iii) The  partners of DKIP have the right to  participate  in
the receipt of dividends  from, or proceeds from the sale of, the Shares held by
DKIP in accordance with their partnership interests in DKIP.

                  (iv) The partners of DKP have the right to  participate in the
receipt of dividends  from, or proceeds from the sale of, the Shares held by DKP
in accordance with their partnership interests in DKP.

                  (v) The participants in the Plan have the right to participate
in the receipt of dividends  from, or proceeds from the sale of, the Shares held
by the Plan in accordance with their interests in the Plan.

Item 7.           Identification  and  Classification of  the  Subsidiary  Which
                  Acquired the Security Being Reported on by the Parent  Holding
                  Company or Control Person:

                  This Item 7 is not applicable.

Item 8.           Identification and Classification of Members of the Group:

                  This Item 8 is not applicable.



                                                             Page 13 of 14 Pages

Item 9.           Notice of Dissolution of Group:

                  This Item 9 is not applicable.

Item 10.          Certification:

                  By signing below each of the Reporting Persons certifies that,
to the best of such person's  knowledge and belief,  the securities  referred to
above were not  acquired  and are not held for the purpose of or with the effect
of changing or influencing the control of the Issuer of such securities and were
not  acquired and are not held in  connection  with or as a  participant  in any
transaction having such purpose or effect.






                                                             Page 14 of 14 Pages

                                   SIGNATURES


After  reasonable  inquiry  and to the  best of my  knowledge  and  belief,  the
undersigned  certifies that the information set forth in this statement is true,
complete and correct.


Date:    November 4, 2003                       MARVIN H. DAVIDSON


                                                /s/ Marvin H. Davidson
                                                --------------------------------


Date:    November 4, 2003                       THOMAS L. KEMPNER, JR.


                                                /s/ Thomas L. Kempner, Jr.
                                                --------------------------------

Date:    November 4, 2003                      STEPHEN M. DOWICZ


                                               /s/ Stephen M. Dowicz
                                               ---------------------------------

Date:    November 4, 2003                      SCOTT E. DAVIDSON


                                               /s/ Scott E. Davidson
                                               ---------------------------------

Date:    November 4, 2003                      MICHAEL J. LEFFELL


                                               /s/ Michael J. Leffell
                                               ---------------------------------

Date:    November 4, 2003                      TIMOTHY I. LEVART


                                               /s/ Timothy I. Levart
                                               ---------------------------------

Date:    November 4, 2003                      ROBERT J. BRIVIO, JR.


                                               /s/ Robert J. Brivio, Jr.
                                               ---------------------------------