Hi, I am experimenting with raid6 on 4 drives on 2.6.27.11. The problem I am having is that no matter what chunk size I use, the write benchmark always comes out at single drive speed, although I should be seeing double drive speed (read speed is at near 4x as expected). Is there some hidden setting that I am overlooking, or is this a current known limitation of raid6? In contrast if I make a raid5 on these 4 drives, I get the expected 3xdrive write speed, and occasionally 4xdrive linear read speed. When the write test is running, I get about 14% of system cpu a sporadic 40% of iowait and the rest idle at all times (machine is in runlevel 1 so not to screw with results). Anyone has any ideas? Thank you. -- 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
