[Beowulf] Big storage

Leif Nixon nixon at nsc.liu.se
Thu Aug 30 05:55:26 EDT 2007

Bruce Allen <ballen at gravity.phys.uwm.edu> writes:

> When I buy RAID controllers, I put this requirement directly in my bid
> specifications.  I say something like the following:
> ------------------------------------------------------------------
> 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.
> ------------------------------------------------------------------

I think you should add a parity verification to this - not just a
sector scan.

Leif Nixon                       -            Systems expert
National Supercomputer Centre    -      Linkoping University
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