On 2012-08-15 08:49 Andy Lutomirski <luto@xxxxxxxxxxxxxx> Wrote: >If I do: ># dd if=/dev/zero of=/dev/md0p1 bs=8M >then iostat -m 5 says: > >avg-cpu: %user %nice %system %iowait %steal %idle > 0.00 0.00 26.88 35.27 0.00 37.85 > >Device: tps MB_read/s MB_wrtn/s MB_read MB_wrtn >sdb 265.20 1.16 54.79 5 273 >sdc 266.20 1.47 54.73 7 273 >sdd 264.20 1.38 54.54 6 272 >sdf 286.00 1.84 54.74 9 273 >sde 266.60 1.04 54.75 5 273 >sdg 265.00 1.02 54.74 5 273 >md0 55808.00 0.00 218.00 0 1090 > >If I do: ># dd if=/dev/zero of=/dev/md0p1 bs=8M oflag=direct >then iostat -m 5 says: >avg-cpu: %user %nice %system %iowait %steal %idle > 0.00 0.00 11.70 12.94 0.00 75.36 > >Device: tps MB_read/s MB_wrtn/s MB_read MB_wrtn >sdb 831.00 8.58 30.42 42 152 >sdc 832.80 8.05 29.99 40 149 >sdd 832.00 9.10 29.78 45 148 >sdf 838.40 9.11 29.72 45 148 >sde 828.80 7.91 29.79 39 148 >sdg 850.80 8.00 30.18 40 150 >md0 1012.60 0.00 101.27 0 506 > >It looks like md isn't recognizing that I'm writing whole stripes when >I'm in O_DIRECT mode. > kernel version? >--Andy > >-- >Andy Lutomirski >AMA Capital Management, LLC >-- >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?韬{.n?????%??檩??w?{.n???{炳盯w???塄}?财??j:+v?? ? ???2??璀??摺?囤??z夸z罐?+?????w棹f
