[TUHS] 6th Edition RAID

[TUHS] 6th Edition RAID

[Carl Lowenstein]

I thought I remembered something interesting about 6th Edition RK05
handlers, and went back to check RK(IV) in the manual.  There it is,
Raid 0.

"Drive numbers (minor devices) of eight and larger are treated
specially.  Drive 8+x is the x+1 way interleaving of devices rk0 to
rkx.  Thus blocks on rk10 are distributed alternately among rk0, rk1,
and rk2."  Goes on to enumerate precautions, like don't use the same
physical drive for both normal and interleaved operation.

I myself never tried this, because I didn't have enough confidence in
the error-free operation of a single RK05 drive, let alone two or
more.  Note that this feature disappeared by the time of 7th Edition
RK(4).

    carl
-- 
    carl lowenstein         marine physical lab     u.c. san diego
                                                 clowenstein at ucsd.edu
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[TUHS] 6th Edition RAID

[Tim Bradshaw]

On 1 Jul 2009, at 20:10, Carl Lowenstein wrote:

> I thought I remembered something interesting about 6th Edition RK05
> handlers, and went back to check RK(IV) in the manual.  There it is,
> Raid 0.
>

> [...]

Does anyone know when this kind of striping for performance /  
increased space was first done?  Or to be more specific: is this the  
first instance of it?

--tim
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