Re: raid10 redundancy

Phillip, et al --

...and then Phillip Susi said...
% 
% keld@keldix.com writes:
% 
% > My understanding is that raid10 - all layouts - are really raid0 and
% > then raid 1 on top.
% 
% Naieve implementations work that way, and this is also why they require
% a an even number of disks with 4 being the minimum.  Linux raid10 is not
% naieve and can operate with any number of disks >= 2.
[snip]

I've been chewing on this for a few days and I am STILL confused.  Please
help! :-)

RAID10 is striping AND mirroring (leaving out for the moment the distinction
of striping mirrors vs mirroring stripes).  How can one have both with only
two disks??  You either stripe the two disks together for more storage or
mirror them for redundant storage, but I just don't see how one could do both.


Thanks in advance :-)

:-D
-- 
David T-G
See http://justpickone.org/davidtg/email/
See http://justpickone.org/davidtg/tofu.txt