> I have grown a raid5 over the years with drives and resized > partitions, now I have upgraded to centos7 (from centos5). And > I have the impression the speed is not what it used to be. Yes. Speed most likely has dropped a lot, while performance has probably stayed the same or improved. There is a large tradeoff between flexibility and speed. > Can this be because of some missalignment? Plus a couple of other major reasons. > How can this be verified? While reading (or even worse writing) files sequentially on the filesystem contaioned in that RAID set the 'iostat -dkzyx 1' output will show lots of random accesses and read-modify-write. Your only sensible option is to dump the content, recreate the RAID set and reformat the filesystem, and reload. -- 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
