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In this paper we introduce SPEK (Storage Performance Evaluation Kernel module), a benchmarking tool for measuring and characterizing raw performance of data storage systems at block level. It can be used for both DAS (Direct Attached Storage) and block level networked storage systems. Each SPEK tool consists of a controller, several workers, and one or more probers. Each worker is a kernel module generating I/O requests to lower level SCSI layer directly. Compared to traditional file system anddoi:10.1109/mascot.2003.1240646 dblp:conf/mascots/ZhangYH03 fatcat:jjmckanhhnbxni7eckpvkvsrq4