On 04/24/2012 04:46 PM, Daniel Spannbauer wrote:
Hello, at the moment I'm trying to find a bottleneck on my lamp-server with opensuse 11.4 (Kernel 2.6.37.6) Sometimes the system has a very poor performance because of a high io-wait. If I watch the systems disk-access with "atop -dD" I can see that sda is the most of the time at a load of 10%, sdb sometimes is at 100% or higher at the same time. In my opinion in a Raid1-System both disk should have nearly the same load. Or may I wrong whis this? Both harddisks where changed 3 Weeks ago, /proc/mdstat shows that the rebuild was successfull and the array is functional. Today I've changed th SATA-Cable and the Port on the Maindboard of sdb, but the behaviour is still the same. Both disks passed the extended smart-self-test. Any ideas about that? Regards Daniel
Are the disks more or less the same in all SMART attributes (from smartctl -a)?
I have seen such a behaviour in the case of one disk being marginal, and/or having a couple of bad spots which need several trials to be read. This always also resulted in longer "smartctl -t long" times than usual, but did not always show up clearly in the SMART output (or I looked at the wrong attributes).
I'd try to exchange the disk. HTH, Kay -- 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
