On Tue, Feb 06, 2018 at 07:59:32PM +0100, Reindl Harald wrote: > but 18125K/sec is a joke given that you should run a scrub every week I know it's bad. Right now it's a bit slower than normal because I'm also copying data to the drives. > did you try to play around with sysctl.conf? Yes, I set it to 300,000, but obviously it won't make the hardware go faster than it can. I totally understand the performance is crap, but it's a backup array that I only bring up and power on once a week and scrub once a month, so it's ok enough for the use in question. For now, it's more about me learning how to manually force a block remap, not because I absolutely have to, but because it's always good to know and learn low level tools and how things work. I have used hdrecover in the past which reads all the blocks low level and re-reads a bad block many times to force a successful read and auto remap, but sadly it doesn't take a block offset, so it would only work if I let it run on the whole drive, which would be slow. Marc -- "A mouse is a device used to point at the xterm you want to type in" - A.S.R. Microsoft is to operating systems .... .... what McDonalds is to gourmet cooking Home page: http://marc.merlins.org/ -- 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