After few unsuccesfull google searches about changing linux software raid sync speed (while waiting for idle CentOS to sync 3×200Gb SATA raid1) I decided to run:


ffind /proc/ -name \*raid\*

which lead me to files /proc/sys/dev/raid/speed_limit_max an /proc/sys/dev/raid/speed_limit_min, which are quite self-explanatory and now I’m happily syncing with 40Mb/s.