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Sooner or later all servers will fail (with probability 1).
Hence, lost stripes must be recomputed and reallocated to
available servers.
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A heart-beat protocol allows each server to monitor its neighbors.
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If a neighbor does not provide vitality signs for a predefined
period of time it is considered dead, and its stripes are
considered lost.
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If K functioning servers exchange their stripes, they
can reconstruct lost stripes, and forward them to
still available servers.
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The discovery of lost stripes may require broadcast requests,
as the hints on the locations of all stripes be missing.
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Repair may be run as a periodic background activity.
Its frequency may be increased by the discovery of neighbors death.
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