Xeres Interests S-4/A Registration of securities issued in business combination transactions (amended)

Exhibit 12.1

DUPONT FABROS TECHNOLOGY, INC.

AND THE PREDECESSOR, SAFARI VENTURES LLC

Computation of Ratio of Earnings to Combined Fixed Charges

(Unaudited)

(Amounts in thousands, except ratios)

	DFT															Predecessor
	For the three months ended March 31, 2010			For the three months ended March 31, 2009			For the year ended December 31, 2009			For the year ended December 31, 2008			For the period from October 24, 2007 to December 31, 2007			For the period from January 1, 2007 to October 23, 2007			For the year ended December 31, 2006			For the year ended December 31, 2005			For the year ended December 31, 2004
Earnings:
Net income (loss)	$	5,231		$	3,257		$	2,886		$	36,160		$	(186,548	)	$	(1,619	)	$	(505	)	$	(608	)	$	(374	)
Add: Fixed charges		17,010			9,628			41,455			28,199			4,393			16,902			8,910			106			—
Less: Capitalized interest		(4,403	)		(2,047	)		(7,021	)		(15,448	)		(2,842	)		(1,027	)		(2,630	)		(62	)		—
Total earnings (loss)		17,838			10,838			37,320			48,911			(184,997	)		14,256			5,775			(564	)		(374	)
Fixed Charges and Preferred Stock Dividends:
Interest expense		11,629			5,407			25,462			10,852			1,301			13,480			5,715			44			—
Capitalized interest		4,074			1,642			5,691			13,150			2,567			970			2,253			43			—
Amortization of deferred financing costs		947			2,144			8,854			1,782			230			2,395			565			—			—
Capitalization of amortization of deferred financing costs		329			405			1,330			2,298			275			57			377			19
Interest factor in rents		31			30			118			117			20			—			—			—			—
Preferred stock dividend requirements		—			—			—			—			—			—			—			—			—
Combined Fixed Charges and Preferred Stock Dividends	$	17,010		$	9,628		$	41,455		$	28,199		$	4,393		$	16,902		$	8,910		$	106		$	—
Ratio of earnings (loss) to combined fixed charges (1)		1.05			1.13			(2	)		1.73			(2	)		(2	)		(2	)		(2	)		N/A

(1) DFT and its Predecessor did not have any preferred stock outstanding for the periods presented.

(2) The shortfall of earnings (loss) to combined fixed charges for the year ended December 31, 2009 was $4.1 million. Included in earnings (loss) for the year was a charge of $13.7 million related to the discontinuance of a cash flow hedge. The shortfall of earnings (loss) to combined fixed charges for the period from October 24, 2007 to December 31, 2007 was $189.4 million. Included in earnings (loss) for this period was a charge of $176.5 million related to the acquisition of service agreements in connection with DFT’s IPO and $13.4 million of non-cash stock based compensation expense incurred at the time of the IPO. The shortfall of earnings (loss) to combined fixed charges was $2.6 million, $3.1 million, $0.7 million and $0.4 million for the period from January 1, 2007 to October 23, 2007 and the years ending December 31, 2006 and 2005, respectively.

DUPONT FABROS TECHNOLOGY, L.P.

AND THE PREDECESSOR, SAFARI VENTURES LLC

Computation of Ratio of Earnings to Combined Fixed Charges

(Unaudited)

(Amounts in thousands, except ratios)

	The Operating Partnership															Predecessor
	For the three months ended March 31, 2010			For the three months ended March 31, 2009			For the year ended December 31, 2009			For the year ended December 31, 2008			For the period from October 24, 2007 to December 31, 2007			For the period from January 1, 2007 to October 23, 2007			For the year ended December 31, 2006			For the year ended December 31, 2005			For the year ended December 31, 2004
Earnings:
Net income (loss)	$	5,231		$	3,257		$	2,886		$	36,160		$	(186,548	)	$	(1,619	)	$	(505	)	$	(608	)	$	(374	)
Add: Fixed charges		17,010			9,628			41,455			28,199			4,393			16,902			8,910			106			—
Less: Capitalized interest		(4,403	)		(2,047	)		(7,021	)		(15,448	)		(2,842	)		(1,027	)		(2,630	)		(62	)		—
Total earnings (loss)		17,838			10,838			37,320			48,911			(184,997	)		14,256			5,775			(564	)		(374	)
Fixed Charges and Preferred Stock Dividends:
Interest expense		11,629			5,407			25,462			10,852			1,301			13,480			5,715			44			—
Capitalized interest		4,074			1,642			5,691			13,150			2,567			970			2,253			43			—
Amortization of deferred financing costs		947			2,144			8,854			1,782			230			2,395			565			—			—
Capitalization of amortization of deferred financing costs		329			405			1,330			2,298			275			57			377			19
Interest factor in rents		31			30			118			117			20			—			—			—			—
Preferred stock dividend requirements		—			—			—			—			—			—			—			—			—
Combined Fixed Charges and Preferred Stock Dividends	$	17,010		$	9,628		$	41,455		$	28,199		$	4,393		$	16,902		$	8,910		$	106		$	—
Ratio of earnings (loss) to combined fixed charges (1)		1.05			1.13			(2	)		1.73			(2	)		(2	)		(2	)		(2	)		N/A

(1) The Operating Partnership and its Predecessor did not have any preferred stock outstanding for the periods presented.

(2) The shortfall of earnings (loss) to combined fixed charges for the year ended December 31, 2009 was $4.1 million. Included in earnings (loss) for the year was a charge of $13.7 million related to the discontinuance of a cash flow hedge. The shortfall of earnings (loss) to combined fixed charges for the period from October 24, 2007 to December 31, 2007 was $189.4 million. Included in earnings (loss) for this period was a charge of $176.5 million related to the acquisition of service agreements in connection with DFT’s IPO and $13.4 million of non-cash stock based compensation expense incurred at the time of the IPO. The shortfall of earnings (loss) to combined fixed charges was $2.6 million, $3.1 million, $0.7 million and $0.4 million for the period from January 1, 2007 to October 23, 2007 and the years ending December 31, 2006 and 2005, respectively.