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)
Miles Fidelman
--
In theory, there is no difference between theory and practice.
In<fnord> practice, there is. .... Yogi Berra
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