Mobile clusters of single board computers: an option for providing resources to student projects and researchers

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Table 4 Sequential read/write performance on local storage on a single Raspberry Pi Model B node and on a ThinkPad X240

Manufacturer	Form factor	Capacity [GB]	Speed class	Product ID/Item number	Read\(^{1}\) performance [MB/s]		Write\(^{2}\) perf. [MB/s]
Manufacturer	Form factor	Capacity [GB]	Speed class	Product ID/Item number	Raspberry Pi Model B	ThinkPad X240	Raspberry Pi Model B	ThinkPad X240
Kingston	SD	16	4	SD4/16GB	17.50	20.58	4.36	4.38
SanDisk	SD	16	4	SDSDB-016G	15.80	22.40	4.36	4.46
Verbatim	SD	16	4	#44020	18.40	22.18	7.48	7.62
Verbatim	microSD	16	4	#44007	18.60	71.92	9.50	10.86
Samsung	microSD	16	6	MB-MS16D	18.40	21.92	10.30	12.06
Kingston	SD	16	10	SD10V/16GB	17.50	34.34	10.60	9.82
Kingston	microSD	16	10	SDC10/16GB	17.72	33.64	8.38	11.60
Samsung	microSD	16	10	MB-MP16D	18.10	40.86	10.12	12.24
SanDisk	SD	16	10	SDSDL-016G	18.68	42.04	11.52	12.78
SanDisk	microSD	16	10	SDSDQUI-016G	18.70	42.72	12.18	13.26
SONY	SD	16	10	SF-16UX	17.30	59.10	14.28	24.00
SONY	microSD	16	10	SR-16UY	17.90	35.16	9.64	10.98

\(^{1}\) Measured with: echo 3 \({\mathtt{>}}\) /proc/sys/vm/drop_caches&& dd if=/tmp/testfile of=/dev/null bs=300M count=1
\(^{2}\) Measured with: dd if=/dev/zero of=/tmp/testfile bs=300M count=1 oflag=sync