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Exhibit 21.1*

Subsidiaries of Silicon Graphics International Corp.

Silicon Graphics World Trade BV

Rackable Systems Holding Corp. (Delaware)

Silicon Graphics Federal, LLC.

SGI Japan, Ltd.

Mineset, Inc.

Terrascale Technologies ULC

*Subsidiaries listed are “Significant Subsidiaries” of Silicon Graphics International Corp. as determined in accordance with Item 601 of Regulation S-K and Rule 1-02(w) of Regulation S-X.