> As far as I know, the numbers in between define the queue depth of > commands sent to the disks. > > It's a matter of whether you want the disk(s) firmware to manage > sorting & executing the commands (when the queue is > 1) or not. Well, what I am wondering is whether or not some value higher than 1 might produce better performance without risking the error. > all cases, as far as I know, the kernel does the sorting before > sending the commands to the disk(s). So if you notice better > performance (when the array is stable) with the queue=1, then keep it > that way. Definitely not, it seems. At least for the resync, turning off NCQ dropped the read rate from 35 MBps per drive to 25 MBps per drive. -- 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
