On Thu, 2008-01-31 at 18:08 +0100, Bart Van Assche wrote: > If anyone has a suggestion for a better test than dd to compare the > performance of SCSI storage protocols, please let it know. xdd on /dev/sda, sdb, etc. using -dio to do direct IO seems to work decently, though it is hard (ie, impossible) to get a repeatable sequence of IO when using higher queue depths, as it uses threads to generate multiple requests. You may also look at sgpdd_survey from Lustre's iokit, but I've not done much with that -- it uses the sg devices to send lowlevel SCSI commands. I've been playing around with some benchmark code using libaio, but it's not in generally usable shape. xdd: http://www.ioperformance.com/products.htm Lustre IO Kit: http://manual.lustre.org/manual/LustreManual16_HTML/DynamicHTML-20-1.html -- Dave Dillow National Center for Computational Science Oak Ridge National Laboratory (865) 241-6602 office - To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
