Orvar Korvar wrote:
> Ok. Just to confirm: A modern disk has already some spare capacity which is 
> not normally utilized by ZFS, UFS, etc. If the spare capacity is finished, 
> then the disc should be replaced.
>   

Also, if ZFS decides that a block is bad, it can leave it unused.
For example, if you have a mirrored pool, it is not required that
block N on vdev1 == block N on vdev2. In a sense, this works
like block sparing.

Regarding SMART, there is much discussion on this in the
archives. In a nutshell, there are FMA modules which use
SMART data. There are a few tools which allow an administrator
to see SMART data. Some question whether SMART data is
actually useful.
-- richard

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