11 RAID applications n Hot spare is maintained - if a working disk fails then the information is rewritten to hot spare n RAID can be implemented in hardware or software u software RAID - OS calculates checksums and does writes to raids, F does not need special hardware F slow F not very fault-tolerant - OS crashes - RAID may go with it u hardware RAID - there is a separate CPU on the RAID; RAIDs CPU talks to the disks, calculates checksums and supplies the computer with ready data F faster F fault-tolerant F expensive.
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