Re: wish for Linux MD mirrored raid types

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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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