On Fri, May 06, 2011 at 10:01:48AM -0400, Miles Fidelman wrote: > Keld Jørn Simonsen wrote: > >>As you say, RAID10,near on four disks is pretty much identical to > >>RAID1+0 - i.e., a stripe of two normal RAID1 pairs. > >> > > I don't that's exactly right. At least as I understand it: > > - RAID1+0 (and RAID0+1) nests things - you start with two sets of RAID1 > mirrors, then stripe across them (or vice versa) - it's a nested set of > steps > > - md RAID10 provides both mirroring and striping, but it's a more > integrated function - (from the man page) "RAID10 provides a combination > of RAID1 and RAID0, and sometimes known as RAID1+0. Every datablock is > duplicated some number of times, and the resulting collection of > datablocks are distributed over multiple drives." - but there isn't an > inherent nesting in the process (i.e., no two disks are copies of each > other, and md RAID10 will work over odd numbers of drives) Yes, you are right, RAID1+0 is nested, while Linux MD raid10 is not. But the data layout of Linux MD RAID1+0 and Linux MD RAID10,near is almost identical. keld -- 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
