On 28 Feb 2012, at 19:14, Ronan Cunniffe wrote:
>> 1) Get another disk, and assemble it from the readable parts 2 slightly dead disks.
> I think this will be complicated, because for each stripe, one of the disks is parity, not "real" data: if I reconstruct a disk out of the working bits, some of the reconstruction will be bit-inverted due to parity calculations. Whatever-it-is needs to do a *real* RAID-5 reconstruction using a map of which disk is dead.
>> 2) Write a kernel module which returns blocks from disk A when asked for blocks from disk B for the relevant block ranges.
>> A kernel module? This is how you'd solve it? Niall, I am in awe! ;-)
It was an off the cuff answer, written while I waited for a delayed plane, and would in fact have the same issues as you mentioned for the hardware. It certainly seems as if the code frlinux pointed you at will be a step in the right direction.
Niall
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