**Exhibit 31.3****CERTIFICATION**I, Dana W. Kammersgard, certify that:     1. I have reviewed this amendment no. 1 to annual report on Form 10-K of Dot Hill SystemsCorp.;     2. Based on my knowledge, this amendment no. 1 to annual report does not contain any untruestatement of a material fact or omit to state a material fact necessary to make the statementsmade, in light of the circumstances under which such statements were made, not misleading withrespect to the period covered by this amendment no. 1 to annual report;     3. Based on my knowledge, the financial statements, and other financial information includedin this amendment no. 1 to annual report, fairly present in all material respects the financialcondition, results of operations and cash flows of the registrant as of, and for, the periodspresented in this amendment no. 1 to annual report;     4. The registrant’s other certifying officer(s) and I are responsible for establishing andmaintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules13a-15(f) and 15d-15(f)) for the registrant and have:     a) Designed such disclosure controls and procedures, or caused such disclosure controls andprocedures to be designed under our supervision, to ensure that material information relating tothe registrant, including its consolidated subsidiaries, is made known to us by others within thoseentities, particularly during the period in which this amendment no. 1 to annual report is beingprepared;     b) Designed such internal control over financial reporting, or caused such internal controlover financial reporting to be designed under our supervision, to provide reasonable assuranceregarding the reliability of financial reporting and the preparation of financial statements forexternal purposes in accordance with generally accepted accounting principles;     c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures andpresented in this amendment no. 1 to annual report our conclusions about the effectiveness of thedisclosure controls and procedures, as of the end of the period covered by this report based onsuch evaluation; and     d) Disclosed in this amendment no. 1 to annual report any change in the registrant’s internalcontrol over financial reporting that occurred during the registrant’s most recent fiscal quarter(the registrant’s fourth fiscal quarter in the case of an annual report) that has materiallyaffected, or is reasonably likely to materially affect, the registrant’s internal control overfinancial reporting; and     5. The registrant’s other certifying officer(s) and I have disclosed, based on our most recentevaluation of internal control over financial reporting, to the registrant’s auditors and the auditcommittee of the registrant’s board of directors (or persons performing the equivalent functions):     a) All significant deficiencies and material weaknesses in the design or operation of internalcontrol over financial reporting which are reasonably likely to adversely affect the registrant’sability to record, process, summarize and report financial information; and     b) Any fraud, whether or not material, that involves management or other employees who have asignificant role in the registrant’s internal control over financial reporting.Date: November 13, 2006   /s/ Dana W. Kammersgard   Dana W. Kammersgard  *Chief Executive Officer*