On 02/11/16 17:59, Robert LeBlanc wrote: > We would like to add read performance to our RAID10 volume by adding > another drive (we don't care about space), so I did the following test > with poor results. Quicky reply ... I don't think you can change the number of raid-devices on a raid10. Are you trying to replace a slow drive with a faster one? You can probably use the --replace option. If not that, what do you want to achieve? Cheers, Wol -- 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