another question... why md have more tps? disk elevators? sector size? 2011/4/8 Linux Raid Study <linuxraid.study@xxxxxxxxx>: > Hello, > > I have a raid device /dev/md0 based on 4 devices sd[abcd]. > > When I write 4GB to /dev/md0, I see following output from iostat... > > Ques: > Shouldn't I see write/sec to be same for all four drives? Why does > /dev/sdd always have higher value for BlksWrtn/sec? > My strip size is 1MB. > > thanks for any pointers... > > avg-cpu: %user %nice %system %iowait %steal %idle > 0.02 0.00 0.34 0.03 0.00 99.61 > > Device: tps Blk_read/s Blk_wrtn/s Blk_read Blk_wrtn > sda 1.08 247.77 338.73 37478883 51237136 > sda1 1.08 247.77 338.73 37478195 51237136 > sdb 1.08 247.73 338.78 37472990 51245712 > sdb1 1.08 247.73 338.78 37472302 51245712 > sdc 1.10 247.82 338.66 37486670 51226640 > sdc1 1.10 247.82 338.66 37485982 51226640 > sdd 1.09 118.46 467.97 17918510 70786576 > sdd1 1.09 118.45 467.97 17917822 70786576 > md0 65.60 443.79 1002.42 67129812 151629440 > -- > To unsubscribe from this list: send the line "unsubscribe linux-raid" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html > -- Roberto Spadim Spadim Technology / SPAEmpresarial -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
