> Be patient... You are likely correct as the [ext4lazyinput] process is now gone. Probably finished up last night as the drives are quiet now. For completeness: > What did "cat /proc/mdstat" say? # cat /proc/mdstat Personalities : [raid1] md0 : active raid1 sdc1 sdb1 3906885440 blocks super 1.2 [2/2] [UU] bitmap: 0/30 pages [0KB], 65536KB chunk unused devices: <none> Unfortunely, I can not be 100% certain if the [ext4lazyinput] process was still active when I captured the mdstat output shown above. But that is what it says now that the process is gone. Thanks to everyone for their input.