Digital Realty Trust (DLR) S-4/A Registration of securities issued in business combination transactions (amended)

Exhibit 12.1

Digital Realty Trust, Inc.

Statement of Computation of Ratios (1)

(in thousands, except ratios)

	Six months ended June 30,					Year ended December 31,
	2010		2009			2009			2008			2007		2006		2005
Income from continuing operations before noncontrolling interests	$	45,488	$	42,392		$	91,234		$	67,918		$	22,546	$	24,890	$	24,460
Interest expense		64,064		41,432			88,442			63,621			67,054		50,598		35,381
Interest within rental expense		1,263		1,440			2,633			2,619			1,971		680		147
Noncontrolling interests in consolidated joint ventures		82		(74	)		(140	)		(335	)		—		—		—
Earnings available to cover fixed charges	$	110,897	$	85,190		$	182,169		$	133,823		$	91,571	$	76,168	$	59,988
Fixed charges:
Interest expense	$	64,064	$	41,432		$	88,442		$	63,621		$	67,054	$	50,598	$	35,381
Interest within rental expense(2)		1,263		1,440			2,633			2,619			1,971		680		147
Capitalized interest		4,418		5,219			9,196			18,351			12,264		4,028		279
Fixed Charges		69,745		48,091			100,271			84,591			81,289		55,306		35,807
Ratio of earnings to fixed charges		1.59		1.77			1.82			1.58			1.13		1.38		1.68

(1) All numbers presented in this exhibit exclude 7979 East Tufts Avenue (sold July 2006), 100 Technology Center Drive (sold in March 2007) and 4055 Valley View Lane (sold in March 2007).

(2) Interest within rental expense represents one-third of rental expense (the approximate portion of rental expense representing interest).

Digital Realty Trust, L.P.

Statement of Computation of Ratios (1)

(in thousands, except ratios)

	Six months ended June 30,					Year ended December 31,
	2010		2009			2009			2008			2007		2006		2005
Income from continuing operations before noncontrolling interests	$	45,488	$	42,392		$	91,234		$	67,918		$	22,546	$	24,890	$	24,460
Interest expense		64,064		41,432			88,442			63,621			67,054		50,598		35,381
Interest within rental expense		1,263		1,440			2,633			2,619			1,971		680		147
Noncontrolling interests in consolidated joint ventures		82		(74	)		(140	)		(335	)		—		—		—
Earnings available to cover fixed charges	$	110,897	$	85,190		$	182,169		$	133,823		$	91,571	$	76,168	$	59,988
Fixed charges:
Interest expense	$	64,064	$	41,432		$	88,442		$	63,621		$	67,054	$	50,598	$	35,381
Interest within rental expense(2)		1,263		1,440			2,633			2,619			1,971		680		147
Capitalized interest		4,418		5,219			9,196			18,351			12,264		4,028		279
Fixed Charges		69,745		48,091			100,271			84,591			81,289		55,306		35,807
Ratio of earnings to fixed charges		1.59		1.77			1.82			1.58			1.13		1.38		1.68

(1) All numbers presented in this exhibit exclude 7979 East Tufts Avenue (sold July 2006), 100 Technology Center Drive (sold in March 2007) and 4055 Valley View Lane (sold in March 2007).

(2) Interest within rental expense represents one-third of rental expense (the approximate portion of rental expense representing interest).