All, As I'm trying to achieve maximum performance on mdraid with SSDs, I've noticed a situation that I think could be corrected somewhat easily. I've been having to play the partitioning game to get enough kernel workers to achieve maximum performance on mdraid SSD stripes, but I've run into a few troubling problems. Basically on raid creation and on raid check, many events get DELAYED because they share underlying devices with other mdraid stripes when you look at the status in /proc/mdstat. I feel like mdraid hasn't made the leap to SSDs, in that we have a signal in /sys/block/<md_device>/queue/rotational that could enable these DELAYED activities for SSDs. The SSDs have way more IOPS, both read and write, to handle these DELAYs and we need to start taking advantage of the abilities of the SSDs. It is an SSD world now. Regards, Jim Jim Finlayson U.S. Department of Defense
