Parallelism
Load balance multiple small accesses
Parallelize large accesses
Goal : increase throughput and reduce response time.
Redundancy
Store extra information that can be used to rebuild
information lost in a disk failure
Goal : reduce failure
Lead to high level of dependability
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REDUNDANT ARRAYS OF INEXPENSIVE DISK (RAID)
disk organization techniques that manage a large
numbers of disks, providing a view of a single disk of
high capacity and high speed by using multiple disks in
parallel,
high reliability by storing data redundantly, so that data can
be recovered even if a disk fails