H
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Heartbeat
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Message that is sent regularly by the Cluster Service on one node to the Cluster Service on an alternate node to maintain communication and detect failure.
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Host adapter
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Circuitry that translates between a processor's internal bus and a different bus, such as a SCSI. On the SCSI bus, a host acts as an initiator and the peripheral acts as the target.
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Hub
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Central connecting device in a network that joins communications lines together in a star configuration.