When I buy RAID controllers, I put this requirement directly in my bid
specifications. I say something like the following:
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During a READ operation, if the RAID controller finds an unreadable
(uncorrectable) disk sector, then it will immediately reconstruct the
missing data for that sector using redundant data from the rest of the
array, and WRITE that data to the unreadable (uncorrectable) sector to
force sector reallocation if needed by the disk.
In addition, the RAID controller will perform a continous or regular
(at least daily) background scan of all disk sectors to identify and
repair any unreadable sectors as described above.
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I think you should add a parity verification to this - not just a
sector scan.
Good idea. In other words, don't just check that all disk surfaces are
readable by the disk device. Also check that the data is consistent from
the RAID perspective. Did I understand you correctly?
Cheers,
Bruce
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