On Mon, Nov 16, 2020 at 12:27 PM Finlayson, James M CIV (USA) <james.m.finlayson4.civ@xxxxxxxx> wrote: > Thank you for the tip. My raid5 performance (after creating 32 partitions per SSD) and running 64 9+1 (2 in reality) stripes is up to 11.4M 4K random read IOPS, out of 17M that the box is capable, which I'm happy with, because I can't NUMA the raid stripes as I would the individual SSDs themselves. However, when I perform the RAID0 striping to make the "RAID50 from hell", my performance drops to 7.1M 4K random read IOPS. Any suggestions? The last RAID50, again won't let me generate the queue depth. This is something not currently supported for non-blk-mq disks. Best you could do is to recompile your kernel with a bigger BLKDEV_MAX_RQ. -- wbr, Vitaly
