Re: about linear and about RAID10

[David T-G <davidtg-robot@justpickone.org>]

Reindl, et al --

...and then Reindl Harald said...
% 
% Am 28.11.22 um 15:46 schrieb David T-G:
% > I don't at this time have a device free to plug in locally to back up the
% > volume to destroy and rebuild as linear, so that will have to wait.  When
% > I do get that chance, though, will that help me get to the awesome goal
% > of actually INCREASING performance by including a RAID0 layer?
% 
% stacking layers over layers will *never* increase performance - a pure RAID0
% will but if one disk is dead all is lost

True, and we definitely don't want that.


% 
% additional RAID0 on top or below another RAID won't help

I could believe that, because what I don't know about RAID would fill a
book, but I thought that the idea of RAID10 speeding up access was that
the first half of the data is on the FIRST half of the /first/ disk
and the second half of the data is on the FIRST half of the /second/
disk and so the heads only move over half the disk for reads.


% 
% your main problem starts by slicing your drives in dozens of partitions and
% "the idea being that each piece of which should take less time to rebuild if
% something fails"
[snip]

Whoops!  You're on the wrong machine.  This one mirrors two disks; that
one is the one that has a bunch.


HANN

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