HP NetServer AA 4000 HP AA HP Netserver 4000 Reference Guide - Page 53
Marathon Transport, Monitor, Device Synchronization Layer
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Ch 3: AA 4000 and HP management Tools • 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). • 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. • 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. Network Server Division 3-3