HP NetServer AA 4000 Reference Manual page 53

Network Server Division
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Marathon Transport – This handles all data movement within
the array where the redirectors and providers are concerned. It
works in conjunction with a Device Synchronization Layer to
make devices appear as one to the CEs and move the data using
Marathon Interface Cards (MICs).
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Monitor – This is in charge of all state transitions, reports status
to the Marathon Manager, and executes various Marathon
manager commands. Within this component is a discrete
component known as the fault manager. The IL and other
subsystems depend on the monitor to go online.
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Device Synchronization Layer – Synchronizes all redirected
I/O requests from the CE to the IOPs and all responses from the
IOPs to the CE. This is necessary to account for the difference
in hard drive spin rates and caching among other latency
potentials, by the IOPs. It also ensures that common resources
and requirements are provided.
Ch 3: AA 4000 and HP management Tools
3-3