[ILUG] Why RAID

[Paul Jakma]

On Thu, 15 Jul 2004, Colm Buckley wrote:

> When you add the new (C) drive, all of its data are zeroes, which 
> doesn't change the parity data (N XOR 0 = N).  Fiendishly clever.

Hmm, surely you'd have to zero the new disk first though? I dont 
think you can rely on a new disk being all zero. ;)

Also, it doesnt matter, you have to know which the new block is to be 
able to read the stripe correctly surely? (otherwise data of xy turns 
into xy(0)). If you know that, you can also ignore that new block 
when calculting the parity, and hence you dont need to need to care 
what value the new block is.

> 	Colm

regards,
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