On 2019/06/06 09:25, Marc Roos wrote: > > Hmmm without being a maintainer. I would say cp -r is most used on > single disk, so one thread is using the maximum disk iops taking y time > to copy. --- not exactly true, if the 1 disk as a 20 disk raid10.
You can target 10 areas at a time and get considerable benefit if they are spread across multiple disks in the raid.