On Tue, Aug 14, 2007 at 03:07:02PM -0400, Ming Zhang wrote: > try simple dd on a raw device (no fs) and see the performance. if write > result is much better and u do not see read in iostat, u meet an align > issue simply like what we had in IET list. Does not help. | Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s avgrq-sz avgqu-sz await svctm %util | sdb 2493.21 3600.20 359.64 121.78 22810.79 30863.54 111.49 126.38 267.37 2.08 99.94 Bastian -- Where there's no emotion, there's no motive for violence. -- Spock, "Dagger of the Mind", stardate 2715.1 |