The Performance of Parity Placements in Disk Arrays
IEEE Transactions on Computers
RAIDframe: rapid prototyping for disk arrays
Proceedings of the 1996 ACM SIGMETRICS international conference on Measurement and modeling of computer systems
Efficient Placement of Parity and Data to Tolerate Two Disk Failures in Disk Array Systems
IEEE Transactions on Parallel and Distributed Systems
Timing-Accurate Storage Emulation
FAST '02 Proceedings of the Conference on File and Storage Technologies
Enhancing Write I/O Performance of Disk Array RM2 Tolerating Double Disk Failures
ICPP '02 Proceedings of the 2002 International Conference on Parallel Processing
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To measure accurate performance of the new RAID storage system, simulators and emulators must consider the behavior of system components, such as the host connection interface, internal system bus, internal I/O bus, and physical disk. Moreover, the behavior of RAID functional operations with the buffer cache is also considered important. Although many RAID simulators exist, they do not consider all the components of RAID storage systems, resulting in inaccurate performance measurements. As far as we know, there exists no RAID emulator that considers all system components. Therefore, we present a RAID emulator to correct this defect. It is implemented as a user-level process in Linux. It interacts with a host via a physical I/O interface like FibreChannel; that is, the effect of interactions between the host and the RAID controller is physically considered. It interacts with physical disks via SCSI or FibreChannel; that is, the effect of interaction between RAID controller and disks is considered. Moreover, RAID functional operations such as the buffer cache and block mapping function are also considered in overall timing measurements.