Am 12.05.21 um 19:22 schrieb David T-G:
Phillip, et al --
...and then Phillip Susi said...
%
% keld@xxxxxxxxxx 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
by wasting even more space
the point of mirroring is that there are two phyiscal drives with each
stripe
you can even have 20 partitions on the disks and make a big RAID10 out
of them - not that it makes sense but you can
the point of such setups is typically temporary: at the moment only two
disks are here but i want a RAID10 at the end of the day
for such setups often you even start with a degraded RAID and later add
drives
