On 03/04/2013 08:34 AM, m.roth at 5-cent.us wrote: > <http://en.wikipedia.org/wiki/Non-standard_RAID_levels#Linux_MD_RAID_10>, > and it seems to be a non-standard RAID, with several options, and the > first uses only two drives. The storage industry tends to use "RAID 1+0" when they specifically refer to the older striped sets of mirrors. RAID 10, as implemented under Linux is also found in some high end RAID controllers. Among other things, it will allow you to have a RAID set with an odd number of devices, and ensure that all of the stripes are on two different disks. The description of Linux RAID10 on the wikipedia "nested raid levels", referred to by zGreenfelder, was probably written by someone unfamiliar with the topic. I'm not able substantiate a number of the claims made therein. I wouldn't rely on that information.