>My justification for this is that it seems to me that you can split
>disk behavior into two states:
>- returns data ok
>- doesn't return data ok


I think you're missing "won't write".

There's clearly a difference between "get data from a different copy"
which you can fix but retrying data to a different part of the redundant 
data and writing data: the data which can't be written must be kept
until the drive is faulted.


Casper

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