影响光盘阵列数据传输率的几个因素

Factors influencing data transfer rate of optical RAID

为了进一步提高光盘阵列的性能，在分析单个光盘驱动器数据传输过程的基础上，建立了光盘阵列数据传输的理论模型。从理论和实验两个方面分析了传输的数据长度、ＳＣＳＩ总线速度与光驱速度之比、数据分块大小对光盘阵列数据传输率的影响程度，并提出了优化设计方法。实验表明，通过选择合适的应用背景、减少总线冲突等优化设计方法，可使光盘阵列数据传输的实测并行度提高到４．２３６， 接近理想值。

Theoretical data transfer model of optical RAID is developed on the base of analysis of single optical drive. The length of transferred data, rate ratio of SCSI bus to rate of optical drive and striped block size are analyzed to be factors of influencing data transfer rate of optical RAID. Their influence on data transfer rate of optical RAID is analyzed and verified by experiments. According to theoretical analysis, an optimization method is presented. Experiments indicate that the SCSI bus conflict can be reduced effectively, and data transfer rate can be increased by about 2.5 times by optimization.