On 9/19/2012 2:20 AM, David Brown wrote: > On 18/09/2012 23:38, Stan Hoeppner wrote: >> Actually, no. The level of parallelism is the same--30 concurrent >> writes. As noted above, the increase in performance comes from locating >> each of the AGs on a different disk, or array. This decreases the >> number of seeks requires per write, especially with parity arrays. > OK, so you get 30 parallel logical writes, but if it does not translate > into multiple parallel physical writes to the disks by having multiple > member disks, then the gains are small. The problem in the OP's case isn't a lack of physical write parallelism, but most likely a problem of seek starvation caused by write parallelism. -- Stan -- 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
