Mailinglist Archive: opensuse (1196 mails)

[Dave Howorth <dhoworth@xxxxxxxxxxxxxxxxx>]

Carlos E. R. wrote:
> Except... The HD tries to move the data in a bad sector to a spare
> sector; but the data itself might be bad (read failure). Notice that
> this is an operation that happens totally inside the HD, without any
> consideration for the mirrored disk. Nobody outside of the HD knows
> about the problem.

Surely the user (or operating system at least) learns of a read failure?
Wouldn't that lead to system/user-level retries and if they failed to
rewriting of the sector from the mirror, which in turn would cause the
remap?

Just trying to understand how all the cogs interlock :)

Cheers, Dave

> The result could be that both sides had different
> data after the operation. However, the remapping occurs only during a
> write operation, so the preceding scenario would not happen.

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